QM48S40012-NS0T [BEL]
DC-DC Regulated Power Supply Module, 1 Output, 132W, Hybrid, QUARTER BRICK, 8 PIN;
| 型号： | QM48S40012-NS0T |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, 132W, Hybrid, QUARTER BRICK, 8 PIN |
| 文件： | 总37页 (文件大小：611K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QM48S DC-DC Converter Series Data Sheet
40A Output
The QmaXTM Series of high current single output DC-DC
converters from Power-One sets new standards for thermal
performance and power density in the quarter brick package.
The 40A QM48S converters of the QmaXTM Series provide
thermal performance in high temperature environments that
is comparable to or exceeds the industry’s leading 40A half
bricks. This is accomplished through the use of patent pend-
ing circuit, packaging and processing techniques to achieve
ultra-high efficiency, excellent thermal management and a
very low body profile.
QM48S40 Converter
Features
•
RoHS lead-free solder and lead-solder-exempted
products are available
Delivers up to 40 A (132 W)
Industry-standard SM quarter-brick pinout
Higher current capability at 70 ºC than most competi-
tors’ 40 A half-bricks
The QM48S40 converters have a power density of up to
130 W/in3, more than twice that of competitors’ 40A half
bricks. Over 2 square inches of board space can be saved
for every slot in which a 40A half brick is replaced with a
QM48S40 converter from Power-One.
•
•
•
Low body profile and the preclusion of heat sinks minimize
impedance to system airflow, thus enhancing cooling for
downstream devices. The use of 100% automation for as-
sembly, coupled with Power-One’s advanced electric and
thermal design, results in a product with extremely high reli-
ability.
•
•
•
•
•
•
•
•
•
•
•
•
•
On-board input differential LC-filter
Outputs available: 3.3, 2.5, 2.0, 1.8, 1.5, 1.2 & 1.0 V
High efficiency – no heat sink required
Start-up into pre-biased output
No minimum load required
Low profile: 0.28” [7.1 mm]
Low weight: 1.06 oz [30 g] typical
Operating from a 36-75 V input, the QmaXTM Series con-
verters provide any standard output voltage from 3.3 V down
to 1.0 V. Outputs can be trimmed from –20% to +10% of the
nominal output voltage (±10% for output voltages 1.2 V and
1.0 V), thus providing outstanding design flexibility.
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Fixed-frequency operation
Fully protected
Remote output sense
Output voltage trim range: +10%/−20% with Industry-
standard trim equations (except 1.2 V and 1.0 V out-
puts with trim range ±10%)
High reliability: MTBF of 2.6 million hours, calculated
per Telcordia TR-332, Method I Case 1
Positive or negative logic ON/OFF option
UL 60950 recognition in US and Canada and DEMKO
certification per IEC/EN 60950
Applications
•
•
•
•
Telecommunications
Data communications
Wireless
•
•
•
•
Meets conducted emissions requirements of FCC
Class B and EN 55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
•
Servers
NOV 13, 2006 revised to MAR 28, 2007
Page 1 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Electrical Specifications (common to all versions)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, All output voltages, unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Ambient Temperature
Storage Temperature
Continuous
0
-40
-55
80
85
125
Vdc
°C
°C
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
Turn-off Threshold
Input Voltage Transient
36
48
75
Vdc
Non-latching
100 ms
33
31
34
32
35
33
100
Vdc
Vdc
Vdc
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance
2000
10
Vdc
nF
MΩ
1.4
Isolation Resistance
FEATURE CHARACTERISTICS
Switching Frequency
415
kHz
%
%
Output Voltage Trim Range1
-20
-10
+10
+10
+10
140
Industry-std. equations (3.3 - 1.5 V)
Use trim equation on Page 4 (1.2 - 1.0 V)
Percent of VOUT(NOM)
Remote Sense Compensation1
Output Over-Voltage Protection
Auto-Restart Period
Turn-On Time
%
Non-latching
Applies to all protection features
117
128
100
4
%
ms
ms
ON/OFF Control (Positive Logic)
Converter Off
-20
2.4
0.8
20
Vdc
Vdc
Converter On
ON/OFF Control (Negative Logic)
Converter Off
2.4
-20
20
0.8
Vdc
Vdc
Converter On
Additional Notes:
1. Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources
should not exceed 10% of VOUT(NOM), in order to insure specified operation of over-voltage protection circuitry.
NOV 13, 2006 revised to MAR 28, 2007
Page 2 of 37
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QM48S DC-DC Converter Series Data Sheet
40A Output
case it must be capable of sourcing or sinking up to 1 mA
depending on the signal polarity. See the Start-up Informa-
tion section for system timing waveforms associated with
use of the ON/OFF pin.
Operation
Input and Output Impedance
These power converters have been designed to be stable
with no external capacitors when used in low inductance in-
put and output circuits.
Remote Sense (Pins 5 and 7)
The remote sense feature of the converter compensates for
voltage drops occurring between the output pins of the con-
verter and the load. The SENSE(-) (Pin 5) and SENSE(+)
(Pin 7) pins should be connected at the load or at the point
where regulation is required (see Fig. B).
However, in many applications, the inductance associated
with the distribution from the power source to the input of the
converter can affect the stability of the converter. The addi-
tion of a 33 µF electrolytic capacitor with an ESR < 1 Ω
across the input helps ensure stability of the converter. In
many applications, the user has to use decoupling capaci-
tance at the load. The power converter will exhibit stable op-
eration with external load capacitance up to 40,000 µF on
3.3 – 1.0 V outputs.
TM Series
Rw
QmaX
Vout (+)
Vin (+)
ON/OFF
Vin (-)
Converter
100
SENSE (+)
(Top View)
Rload
TRIM
Vin
SENSE (-)
10
ON/OFF (Pin 2)
Vout (-)
Rw
The ON/OFF pin is used to turn the power converter on or
off remotely via a system signal. There are two remote con-
trol options available, positive logic and negative logic and
both are referenced to Vin(-). Typical connections are shown
in Fig. A.
Fig. B: Remote sense circuit configuration.
If remote sensing is not required, the SENSE(-) pin must be
connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin
must be connected to the Vout(+) pin (Pin 8) to ensure the
converter will regulate at the specified output voltage. If
these connections are not made, the converter will deliver an
output voltage that is slightly higher than the specified value.
TM Series
QmaX
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
(Top View)
Rload
Vin
SENSE (-)
Vout (-)
Because the sense leads carry minimal current, large traces
on the end-user board are not required. However, sense
traces should be located close to a ground plane to minimize
system noise and insure optimum performance. When wiring
discretely, twisted pair wires should be used to connect the
sense lines to the load to reduce susceptibility to noise.
CONTROL
INPUT
Fig. A: Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF pin is
at a logic high and turns off when at a logic low. The con-
verter is on when the ON/OFF pin is left open.
The converter’s output over-voltage protection (OVP) senses
the voltage across Vout(+) and Vout(-), and not across the
sense lines, so the resistance (and resulting voltage drop)
between the output pins of the converter and the load should
be minimized to prevent unwanted triggering of the OVP.
The negative logic version turns on when the pin is at a logic
low and turns off when the pin is at a logic high. The
ON/OFF pin can be hard wired directly to Vin(-) to enable
automatic power up of the converter without the need of an
external control signal.
When utilizing the remote sense feature, care must be taken
not to exceed the maximum allowable output power capabil-
ity of the converter, equal to the product of the nominal out-
put voltage and the allowable output current for the given
conditions.
ON/OFF pin is internally pulled-up to 5 V through a resistor.
A mechanical switch, open collector transistor, or FET can
be used to drive the input of the ON/OFF pin. The device
must be capable of sinking up to 0.2 mA at a low level volt-
age of ≤ 0.8 V. An external voltage source (±20 V maximum)
may be connected directly to the ON/OFF input, in which
NOV 13, 2006 revised to MAR 28, 2007
Page 3 of 37
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QM48S DC-DC Converter Series Data Sheet
40A Output
When using remote sense, the output voltage at the con-
QmaXTM Series
Converter
verter can be increased by as much as 10% above the
nominal rating in order to maintain the required voltage
across the load. Therefore, the designer must, if necessary,
decrease the maximum current (originally obtained from the
derating curves) by the same percentage to ensure the con-
verter’s actual output power remains at or below the maxi-
mum allowable output power.
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
(Top View)
R T-INCR
Rload
Vin
SENSE (-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
Output Voltage Adjust /TRIM (Pin 6)
To decrease the output voltage (Fig. D), a trim resistor,
T-DECR, should be connected between the TRIM (Pin 6) and
R
The output voltage can be adjusted up 10% or down 20% for
Vout ≥ 1.5 V, and ±10% for Vout = 1.2 V and 1.0 V relative
to the rated output voltage by the addition of an externally
connected resistor. For 3.3 V output voltage, trim up to 10%
is guaranteed only at Vin ≥ 40 V, and it is marginal (8% to
10%) at Vin = 36 V.
SENSE(-) (Pin 5), with a value of:
511
RT−DECR
RT−DECR
RT−DECR
=
=
=
−10.22 [kΩ] (3.3 - 1.5 V)
− 15 [kΩ] (1.2 V)
| Δ |
700
| Δ |
700
| Δ |
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 µF capacitor is con-
nected internally between the TRIM and SENSE(-) pins.
− 17 [kΩ] (1.0 V)
where, RT−DECR = Required value of trim-down resistor [kΩ]
and Δ is as defined above.
To increase the output voltage, refer to Fig. C. A trim resis-
tor, RT-INCR, should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of:
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter bricks (except for 1.2 V and 1.0 V outputs).
5.11(100 + Δ)VO−NOM − 626
R
R
R
T−INCR
=
=
=
− 10.22 [kΩ] (3.3 -1.5V)
1.225Δ
Converters with output voltages 1.2 V and 1.0 V are avail-
able with alternative trim feature to provide the customers
with the flexibility of second sourcing.
84.6
T−INCR
T−INCR
− 7.2 [kΩ] (1.2 V)
Δ
For 1.2 V and 1.0 V only, “T” version converter with the last
character in the part number “T” uses the following trim
equations:
120
− 9 [kΩ] (1.0 V)
Δ
485
where,
RT−INCR =
RT−INCR =
RT−DECR =
[kΩ] (1.2V)
Δ
RT−INCR = Required value of trim-up resistor kΩ]
VO−NOM = Nominal value of output voltage [V]
323
Δ
− 2
[kΩ] (1.0V)
511
| Δ |
− 10.22
[kΩ] (For 1.2V and 1.0V)
(VO-REQ − VO-NOM)
Δ =
X 100 [%]
VO -NOM
For 1.2V only, “U” version converter with the last character in
the part number “U” uses the following trim equations:
VO−REQ = Desired (trimmed) output voltage [V].
100
RT−INCR =
[kΩ]
[kΩ]
When trimming up, care must be taken not to exceed the
converter‘s maximum allowable output power. See previous
section for a complete discussion of this requirement.
Δ
100
RT−DECR =
− 2
| Δ |
NOV 13, 2006 revised to MAR 28, 2007
Page 4 of 37
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QM48S DC-DC Converter Series Data Sheet
40A Output
Output Overvoltage Protection (OVP)
The converter will shut down if the output voltage across
Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of
TM Series
Converter
QmaX
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
(Top View)
Rload
the OVP circuitry. The OVP circuitry contains its own refer-
Vin
RT-DECR
ence, independent of the output voltage regulation loop.
Once the converter has shut down, it will attempt to restart
every 100 ms until the OVP condition is removed.
SENSE (-)
Vout (-)
Overtemperature Protection (OTP)
Fig. D: Configuration for decreasing output voltage.
The converter will shut down under an over-temperature
Trimming/sensing beyond 110% of the rated output voltage
is not an acceptable design practice, as this condition could
cause unwanted triggering of the output over-voltage protec-
tion (OVP) circuit. The designer should ensure that the dif-
ference between the voltages across the converter’s output
pins and its sense pins does not exceed 10% of VOUT(NOM),
or:
condition to protect itself from overheating caused by opera-
tion outside the thermal derating curves, or operation in ab-
normal conditions such as system fan failure. After the con-
verter has cooled to a safe operating temperature, it will
automatically restart.
Safety Requirements
[VOUT(+) − VOUT(−)]−[VSENSE(+) − VSENSE(−)] ≤ VO - NOM X10% [V]
The converters meet North American and International
safety regulatory requirements per UL60950 and EN60950.
Basic Insulation is provided between input and output.
This equation is applicable for any condition of output sens-
ing and/or output trim.
To comply with safety agencies requirements, an input line
fuse must be used external to the converter. The Table be-
low provides the recommended fuse rating for use with this
family of products.
Protection Features
Input Undervoltage Lockout
Input undervoltage lockout is standard with this converter.
The converter will shut down when the input voltage drops
below a pre-determined voltage.
Output Voltage
Fuse Rating
3.3 V
2.5 -1.8 V
7.5-A
5-A
The input voltage must be typically 34 V for the converter to
turn on. Once the converter has been turned on, it will shut
off when the input voltage drops typically below 32 V. This
feature is beneficial in preventing deep discharging of batter-
ies used in telecom applications.
Modules are UL approved for maximum fuse rating of 15-A.
To protect a group of modules with a single fuse, the rating
can be increased from the recommended values above.
Electromagnetic Compatibility (EMC)
Output Overcurrent Protection (OCP)
EMC requirements must be met at the end-product system
level, as no specific standards dedicated to EMC character-
istics of board mounted component dc-dc converters exist.
However, Power-One tests its converters to several system
level standards, primary of which is the more stringent
EN55022, Information technology equipment - Radio distur-
bance characteristics - Limits and methods of measurement.
The converter is protected against overcurrent or short cir-
cuit conditions. Upon sensing an over-current condition, the
converter will switch to constant current operation and
thereby begin to reduce output voltage. When the output
voltage drops below 50% of the nominal value of output volt-
age, the converter will shut down.
Effective internal LC differential filter significantly reduces
input reflected ripple current, and improves EMC.
Once the converter has shut down, it will attempt to restart
nominally every 100 ms with a typical 1-2% duty cycle. The
attempted restart will continue indefinitely until the overload
or short circuit conditions are removed or the output voltage
rises above 50% of its nominal value.
With the addition of a simple external filter, all versions of the
QmaX™ Series of converters pass the requirements of
Class B conducted emissions per EN55022 and FCC, and
meet at a minimum, Class A radiated emissions per EN
55022 and Class B per FCC Title 47CFR, Part 15-J. Please
contact Power-One Applications Engineering for details of
this testing.
NOV 13, 2006 revised to MAR 28, 2007
Page 5 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
and 85°C, with airflow rates from 30 to 500 LFM (0.15 to 2.5
m/s).
Characterization
For each set of conditions, the maximum load current was
defined as the lowest of:
General Information
The converter has been characterized for many operational
aspects, to include thermal derating (maximum load current
as a function of ambient temperature and airflow) for vertical
and horizontal mounting, efficiency, start-up and shutdown
parameters, output ripple and noise, transient response to
load step-change, overload and short circuit.
(i) The output current at which any FET junction temperature
does not exceed a maximum specified temperature (120°C)
as indicated by the thermographic image, or
(ii) The nominal rating of the converter (40 A on 3.3 – 1.0 V).
During normal operation, derating curves with maximum FET
temperature less than or equal to 120°C should not be ex-
ceeded. Temperature on the PCB at the thermocouple loca-
tion shown in Fig. H should not exceed 118°C in order to
operate inside the derating curves.
The figures are numbered as Fig. x.y, where x indicates the
different output voltages, and y associates with specific plots
(y = 1 for the vertical thermal derating, …). For example, Fig.
x.1 will refer to the vertical thermal derating for all the output
voltages in general.
Efficiency
The following pages contain specific plots or waveforms as-
sociated with the converter. Additional comments for specific
data are provided below.
Fig. x.3 shows the efficiency vs. load current plot for ambient
temperature of 25ºC, airflow rate of 300 LFM (1.5 m/s) with
vertical mounting and input voltages of 36 V, 48 V and 72 V.
Also, a plot of efficiency vs. load current, as a function of
ambient temperature with Vin = 48 V, airflow rate of 200 LFM
(1 m/s) with vertical mounting is shown in Fig. x.4.
Test Conditions
All data presented were taken with the converter soldered to
a test board, specifically a 0.060” thick printed wiring board
(PWB) with four layers. The top and bottom layers were not
metalized. The two inner layers, comprising two-ounce cop-
per, were used to provide traces for connectivity to the con-
verter.
Power Dissipation
Fig. x.5 shows the power dissipation vs. load current plot for
Ta = 25ºC, airflow rate of 300 LFM (1.5 m/s) with vertical
mounting and input voltages of 36 V, 48 V and 72 V. Also, a
plot of power dissipation vs. load current, as a function of
ambient temperature with Vin = 48 V, airflow rate of 200 LFM
(1 m/s) with vertical mounting is shown in Fig. x.6.
The lack of metalization on the outer layers as well as the
limited thermal connection ensured that heat transfer from
the converter to the PWB was minimized. This provides a
worst-case but consistent scenario for thermal derating pur-
poses.
Start-up
All measurements requiring airflow were made in Power-
One’s vertical and horizontal wind tunnel facilities using In-
frared (IR) thermography and thermocouples for thermome-
try.
Output voltage waveforms, during the turn-on transient using
the ON/OFF pin for full rated load currents (resistive load)
are shown without and with external load capacitance in
Fig. x.7 and Fig. x.8, respectively.
Ensuring components on the converter do not exceed their
ratings is important to maintaining high reliability. If one an-
ticipates operating the converter at or close to the maximum
loads specified in the derating curves, it is prudent to check
actual operating temperatures in the application. Thermo-
graphic imaging is preferable; if this capability is not avail-
able, then thermocouples may be used. Power-One recom-
mends the use of AWG #40 gauge thermocouples to ensure
measurement accuracy. Careful routing of the thermocouple
leads will further minimize measurement error. Refer to Fig-
ure H for optimum measuring thermocouple location.
Ripple and Noise
Fig. x.10 shows the output voltage ripple waveform, meas-
ured at full rated load current with a 10 µF tantalum and 1 µF
ceramic capacitor across the output. Note that all output
voltage waveforms are measured across a 1 μF ceramic ca-
pacitor.
The input reflected ripple current waveforms are obtained
using the test setup shown in Fig x.11. The corresponding
waveforms are shown in Fig. x.12 and Fig. x.14.
Thermal Derating
Load current vs. ambient temperature and airflow rates are
given in Figs. x.1 and x.2 for vertical and horizontal converter
mounting. Ambient temperature was varied between 25°C
NOV 13, 2006 revised to MAR 28, 2007
Page 6 of 37
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QM48S DC-DC Converter Series Data Sheet
40A Output
VIN
Start-up Information (using negative ON/OFF)
ON/OFF
STATE
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure E.
OFF
ON
Time
Comments
t0
ON/OFF pin is ON; system front end power is toggled
on, VIN to converter begins to rise.
VOUT
t1
t2
t3
VIN crosses Under-Voltage Lockout protection circuit
threshold; converter enabled.
Converter begins to respond to turn-on command (con-
verter turn-on delay).
t
t0
t1 t2
t3
Converter VOUT reaches 100% of nominal value.
Fig. E: Start-up scenario #1.
For this example, the total converter start-up time (t3- t1) is typically
4 ms.
VIN
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure F.
Time
t0
t1
Comments
VINPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
ON/OFF
STATE
OFF
ON
t2
t3
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
For this example, the total converter start-up time (t3- t1) is typically
4 ms.
VOUT
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously powered, converter is disabled and then en-
abled via ON/OFF pin. See Figure G.
t
t0
t1 t2
t3
Time
t0
t1
Comments
Fig. F: Start-up scenario #2.
VIN and VOUT are at nominal values; ON/OFF pin ON.
ON/OFF pin arbitrarily disabled; converter output falls
to zero; turn-on inhibit delay period (100 ms typical) is
initiated, and ON/OFF pin action is internally inhibited.
ON/OFF pin is externally re-enabled.
VIN
t2
If (t2- t1) ≤ 100 ms, external action of ON/OFF pin
is locked out by start-up inhibit timer.
If (t2- t1) > 100 ms, ON/OFF pin action is internally
enabled.
100 ms
ON/OFF
STATE
OFF
ON
t3
Turn-on inhibit delay period ends. If ON/OFF pin is ON,
converter begins turn-on; if off, converter awaits
ON/OFF pin ON signal; see Figure F.
t4
t5
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
VOUT
For the condition, (t2- t1) ≤ 100 ms, the total converter start-up
time (t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, start-up will
be typically 4 ms after release of ON/OFF pin.
t
t0
t1
t2
t3 t4
t5
Fig. G: Start-up scenario #3.
NOV 13, 2006 revised to MAR 28, 2007
Page 7 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Electrical Specifications: QM48S40033 (3.3 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=3.3 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
40 Adc, 3.3 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
4.1
Adc
mAdc
mAdc
mAPK-PK
dB
3
63
7.5
TBD
120Hz
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
3.267
3.250
3.300
3.333
Vdc
±2
±2
±5
±5
3.350
50
40,000
40
52
mV
mV
Vdc
mVPK-PK
μF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 μF tantalum + 1 μF ceramic
Plus full load (resistive)
30
0
42
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
60
15
Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 1 A/μS
Setting Time to 1%
Co = 470 μF tantalum + 1 μF ceramic
120
80
mV
µs
EFFICIENCY
100% Load
50% Load
90.5
92.5
%
%
Additional Notes: 2. -40ºC to 85ºC
50
50
40
30
40
30
20
10
0
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
20
10
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 3.3V.1: Available load current vs. ambient air temperature
and airflow rates for QM48S40033 converter mounted verti-
cally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
Fig. 3.3V.2: Available load current vs. ambient air temperature
and airflow rates for QM48S40033 converter mounted horizon-
tally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
NOV 13, 2006 revised to MAR 28, 2007
Page 8 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40033 (3.3 Volts Out)
0.95
0.95
0.90
0.85
0.80
0.90
0.85
0.80
0.75
0.70
0.65
72 V
48 V
36 V
70 C
55 C
40 C
0.75
0.70
0.65
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 3.3V.3: Efficiency vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to pin 1
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 3.3V.4: Efficiency vs. load current and ambient tempera-
ture for converter mounted vertically with Vin = 48 V and air
flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
16.00
12.00
8.00
16.00
12.00
8.00
72 V
48 V
36 V
70 C
55 C
40 C
4.00
4.00
0.00
0.00
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 3.3V.5: Power dissipation vs. load current and input volt-
age for converter mounted vertically with air flowing from pin 3
to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 3.3V.6: Power dissipation vs. load current and ambient
temperature for converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0
m/s).
NOV 13, 2006 revised to MAR 28, 2007
Page 9 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40033 (3.3 Volts Out)
Fig. 3.3V.8: Turn-on transient at full rated load current (resis-
tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (1 V/div.). Time scale: 2 ms/div.
Fig. 3.3V.7: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (1 V/div.) Time scale: 2 ms/div.
Fig. 3.3V.10: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 μF tantalum +
1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.
Fig. 3.3V9: Output voltage response to load current step-
change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div).
Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-
ramic. Time scale: 0.2 ms/div.
NOV 13, 2006 revised to MAR 28, 2007
Page 10 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40033 (3.3 Volts Out)
iS
iC
10 μH
source
inductance
TM Series
33 μF
ESR <1
electrolytic
capacitor
1 μF
ceramic
capacitor
QmaX
DC/DC
Converter
Vout
Vsource
Fig. 3.3V.11: Test setup for measuring input reflected ripple currents, ic and is.
Fig. 3.3V12: Input reflected ripple current, is (10 mA/div),
measured through 10 μH at the source at full rated load cur-
rent and Vin = 48 V. Refer to Fig. 3.3V.11 for test setup.
Time scale: 1μs/div.
Fig. 3.3V14: Input reflected ripple current, ic (100 mA/div),
measured at input terminals at full rated load current and Vin
= 48 V. Refer to Fig. 3.3V.11 for test setup. Time scale: 1
μs/div.
4.0
3.0
2.0
1.0
0
60
0
15
30
45
Iout [Adc]
Fig. 3.3V.15: Load current (top trace, 20 A/div, 20 ms/div)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-
tom trace (20 A/div, 1 ms/div) is an expansion of the on-time
portion of the top trace.
Fig. 3.3V.13: Output voltage vs. load current showing cur-
rent limit point and converter shutdown point. Input voltage
has almost no effect on current limit characteristic.
NOV 13, 2006 revised to MAR 28, 2007
Page 11 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Electrical Specifications: QM48S40025 (2.5 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=2.5 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
40 Adc, 2.5 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
3.2
Adc
mAdc
mAdc
mAPK-PK
dB
3
50
10
120Hz
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
2.475
2.462
2.500
2.525
Vdc
±2
±2
±5
±5
2.538
50
40,000
40
52
mV
mV
Vdc
mVPK-PK
μF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 μF tantalum + 1 μF ceramic
Plus full load (resistive)
30
0
42
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
60
15
Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 1 A/μS
Setting Time to 1%
Co = 470 μF tantalum + 1 μF ceramic
120
100
mV
µs
EFFICIENCY
100% Load
50% Load
89
91
%
%
Additional Notes: 2. -40ºC to 85ºC
50
50
40
30
40
30
20
10
0
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
20
10
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 2.5V.1: Available load current vs. ambient air temperature
and airflow rates for QM48S40025 converter mounted verti-
cally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
Fig. 2.5V.2: Available load current vs. ambient air temperature
and airflow rates for QM48S40025 converter mounted horizon-
tally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
NOV 13, 2006 revised to MAR 28, 2007
Page 12 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40025 (2.5 Volts Out)
0.95
0.90
0.85
0.80
0.95
0.90
0.85
0.80
0.75
0.70
0.65
70 C
55 C
40 C
0.75
72 V
48 V
36 V
0.70
0.65
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 2.5V.4: Efficiency vs. load current and ambient tempera-
ture for converter mounted vertically with Vin = 48 V and air
flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 2.5V.3: Efficiency vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to pin 1
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
16.00
12.00
8.00
16.00
12.00
8.00
72 V
48 V
36 V
70 C
55 C
40 C
4.00
4.00
0.00
0.00
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 2.5V.5: Power dissipation vs. load current and input volt-
age for converter mounted vertically with air flowing from pin 3
to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 2.5V.6: Power dissipation vs. load current and ambient
temperature for converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0
m/s).
NOV 13, 2006 revised to MAR 28, 2007
Page 13 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40025 (2.5 Volts Out)
Fig. 2.5V.7: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (1 V/div.) Time scale: 2 ms/div.
Fig. 2.5V.8: Turn-on transient at full rated load current (resis-
tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (1 V/div.). Time scale: 2 ms/div.
Fig. 2.5V.9: Output voltage response to load current step-
change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div).
Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-
ramic. Time scale: 0.2 ms/div.
Fig. 2.5V.10: Output voltage ripple (20 mV/div.) at full rated load
current into a resistive load with Co = 10 μF tantalum + 1uF ce-
ramic and Vin = 48 V. Time scale: 1 μs/div.
NOV 13, 2006 revised to MAR 28, 2007
Page 14 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40025 (2.5 Volts Out)
iS
iC
10 μH
source
inductance
TM Series
33 μF
1 μF
ceramic
capacitor
QmaX
ESR <1
electrolytic
capacitor
DC/DC
Converter
Vout
Vsource
Fig. 2.5V.11: Test setup for measuring input reflected ripple currents, ic and is.
Fig. 2.5V.12: Input reflected ripple current, is (10 mA/div),
measured through 10 μH at the source at full rated load cur-
rent and Vin = 48 V. Refer to Fig. 2.5V.11 for test setup.
Time scale: 1μs/div.
Fig. 2.5V.14: Input reflected ripple current, ic (100 mA/div),
measured at input terminals at full rated load current and Vin
= 48 V. Refer to Fig. 2.5V.11 for test setup. Time scale: 1
μs/div.
3.0
2.5
2.0
1.5
1.0
0.5
0
60
0
15
30
45
Iout [Adc]
Fig. 2.5V.15: Load current (top trace, 20 A/div, 20 ms/div)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-
tom trace (20 A/div, 1 ms/div) is an expansion of the on-time
portion of the top trace.
Fig. 2.5V.13: Output voltage vs. load current showing cur-
rent limit point and converter shutdown point. Input voltage
has almost no effect on current limit characteristic.
NOV 13, 2006 revised to MAR 28, 2007
Page 15 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Electrical Specifications: QM48S40020 (2.0 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=2.0 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
40 Adc, 2.0 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
2.6
Adc
mAdc
mAdc
mAPK-PK
dB
3
40
7.5
TBD
120Hz
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
1.98
2.000
2.02
Vdc
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
±2
±2
±5
±5
2.030
50
40,000
40
52
mV
mV
Vdc
mVPK-PK
μF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 μF tantalum + 1 μF ceramic
Plus full load (resistive)
1.970
30
0
42
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
60
15
Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 1 A/μS
Setting Time to 1%
Co = 470 μF tantalum + 1 μF ceramic
120
110
mV
µs
EFFICIENCY
100% Load
50% Load
88
90
%
%
Additional Notes: 2. -40ºC to 85ºC
50
50
40
30
40
30
20
10
0
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
20
10
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 2.0V.1: Available load current vs. ambient air temperature
and airflow rates for QM48S40020 converter mounted verti-
cally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
Fig. 2.0V.2: Available load current vs. ambient air temperature
and airflow rates for QM48S40020 converter mounted horizon-
tally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
NOV 13, 2006 revised to MAR 28, 2007
Page 16 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40020 (2.0 Volts Out)
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
0.90
0.85
0.80
72 V
48 V
36 V
70 C
55 C
40 C
0.75
0.70
0.65
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 2.0V.3: Efficiency vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to pin 1
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 2.0V.4: Efficiency vs. load current and ambient tempera-
ture for converter mounted vertically with Vin = 48 V and air
flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
16.00
12.00
8.00
16.00
12.00
8.00
72 V
48 V
36 V
70 C
55 C
40 C
4.00
4.00
0.00
0.00
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 2.0V.5: Power dissipation vs. load current and input volt-
age for converter mounted vertically with air flowing from pin 3
to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 2.0V.6: Power dissipation vs. load current and ambient
temperature for converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0
m/s).
NOV 13, 2006 revised to MAR 28, 2007
Page 17 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40020 (2.0 Volts Out)
Fig. 2.0V.7: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (1 V/div.) Time scale: 2 ms/div.
Fig. 2.0V.8: Turn-on transient at full rated load current (resis-
tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (1 V/div.). Time scale: 2 ms/div.
Fig. 2.0V.9: Output voltage response to load current step-
change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div).
Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-
ramic. Time scale: 0.2 ms/div.
Fig. 2.0V.10: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 μF tantalum +
1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.
NOV 13, 2006 revised to MAR 28, 2007
Page 18 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40020 (2.0 Volts Out)
iS
iC
10 μH
source
inductance
TM Series
33 μF
ESR <1
electrolytic
capacitor
1 μF
ceramic
capacitor
QmaX
DC/DC
Converter
Vout
Vsource
Fig. 2.0V.11: Test setup for measuring input reflected ripple currents, ic and is.
Fig. 2.0V.12: Input reflected ripple current, is (10 mA/div), meas-
ured through 10 μH at the source at full rated load current and
Vin = 48 V. Refer to Fig. 2.0V.11 for test setup. Time scale:
1μs/div.
Fig. 2.0V.14: Input reflected ripple current, ic (100 mA/div),
measured at input terminals at full rated load current and Vin
= 48 V. Refer to Fig. 2.0V.11 for test setup. Time scale: 1
μs/div.
3.0
2.5
2.0
1.5
1.0
0.5
0
60
0
15
30
45
Iout [Adc]
Fig. 2.0V.15: Load current (top trace, 20 A/div, 20 ms/div)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-
tom trace (20 A/div, 1 ms/div) is an expansion of the on-time
portion of the top trace.
Fig. 2.0V.13: Output voltage vs. load current showing cur-
rent limit point and converter shutdown point. Input voltage
has almost no effect on current limit characteristic.
NOV 13, 2006 revised to MAR 28, 2007
Page 19 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Electrical Specifications: QM48S40018 (1.8 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.8 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
40 Adc, 1.8 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
2.4
Adc
mAdc
mAdc
mAPK-PK
dB
3
38
10
120Hz
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
1.782
1.773
1.800
1.818
Vdc
±2
±2
±4
±5
1.827
50
40,000
40
52
mV
mV
Vdc
mVPK-PK
μF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 μF tantalum + 1 μF ceramic
Plus full load (resistive)
30
0
42
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
60
15
Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 1 A/μS
Setting Time to 1%
Co = 470 μF tantalum + 1 μF ceramic
120
120
mV
µs
EFFICIENCY
100% Load
50% Load
87
89.5
%
%
Additional Notes: 2. -40ºC to 85ºC
50
50
40
30
40
30
20
10
0
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
20
10
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 1.8V.1: Available load current vs. ambient air temperature
and airflow rates for QM48S40018 converter mounted verti-
cally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
Fig. 1.8V.2: Available load current vs. ambient air temperature
and airflow rates for QM48S40018 converter mounted horizon-
tally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
NOV 13, 2006 revised to MAR 28, 2007
Page 20 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40018 (1.8 Volts Out)
0.95
0.90
0.85
0.80
0.95
0.90
0.85
0.80
0.75
0.70
0.65
70 C
55 C
40 C
72 V
48 V
36 V
0.75
0.70
0.65
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 1.8V.4: Efficiency vs. load current and ambient tempera-
ture for converter mounted vertically with Vin = 48 V and air
flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 1.8V.3: Efficiency vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to pin 1
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
16.00
12.00
8.00
16.00
12.00
8.00
70 C
55 C
40 C
72 V
48 V
36 V
4.00
4.00
0.00
0.00
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 1.8V.6: Power dissipation vs. load current and ambient
temperature for converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0
m/s).
Fig. 1.8V.5: Power dissipation vs. load current and input volt-
age for converter mounted vertically with air flowing from pin 3
to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
NOV 13, 2006 revised to MAR 28, 2007
Page 21 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40018 (1.8 Volts Out)
Fig. 1.8V.7: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (1 V/div.) Time scale: 2 ms/div.
Fig. 1.8V.8: Turn-on transient at full rated load current (resis-
tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (1 V/div.). Time scale: 2 ms/div.
Fig. 1.8V.9: Output voltage response to load current step-
change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div).
Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-
ramic. Time scale: 0.2 ms/div.
Fig. 1.8V.10: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 μF tantalum +
1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.
NOV 13, 2006 revised to MAR 28, 2007
Page 22 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40018 (1.8 Volts Out)
iS
iC
10 μH
source
inductance
TM Series
33 μF
ESR <1
electrolytic
capacitor
1 μF
ceramic
capacitor
QmaX
DC/DC
Converter
Vout
Vsource
Fig. 1.8V.11: Test setup for measuring input reflected ripple currents, ic and is.
Fig. 1.8V.12: Input reflected ripple current, is (10 mA/div), meas-
ured through 10 μH at the source at full rated load current and
Vin = 48 V. Refer to Fig. 1.8V.11 for test setup. Time scale:
1μs/div.
Fig. 1.8V.14: Input reflected ripple current, ic (100 mA/div),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 1.8V.11 for test setup. Time scale: 1 μs/div.
3.0
2.5
2.0
1.5
1.0
0.5
0
60
0
15
30
45
Iout [Adc]
Fig. 1.8V.15: Load current (top trace, 20 A/div, 20 ms/div) into
a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom trace
(20 A/div, 2 ms/div) is an expansion of the on-time portion of
the top trace.
Fig. 1.8V.13: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has al-
most no effect on current limit characteristic.
NOV 13, 2006 revised to MAR 28, 2007
Page 23 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Electrical Specifications: QM48S40015 (1.5 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.5 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
40 Adc, 1.5 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
2
Adc
mAdc
mAdc
mAPK-PK
dB
3
32
7.5
TBD
120Hz
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
1.485
1.477
1.500
1.515
Vdc
±2
±2
±4
±4
1.523
50
40,000
40
52
mV
mV
Vdc
mVPK-PK
μF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 μF tantalum + 1 μF ceramic
Plus full load (resistive)
30
0
42
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
60
15
Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 1 A/μS
Setting Time to 1%
Co = 470 μF tantalum + 1 μF ceramic
120
150
mV
µs
EFFICIENCY
100% Load
50% Load
85.5
88
%
%
Additional Notes: 2. -40ºC to 85ºC
50
50
40
30
40
30
20
10
0
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
20
10
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 1.5V.1: Available load current vs. ambient air temperature
and airflow rates for QM48S40015 converter mounted verti-
cally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
Fig. 1.5V.2: Available load current vs. ambient air temperature
and airflow rates for QM48S40015 converter mounted horizon-
tally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
NOV 13, 2006 revised to MAR 28, 2007
Page 24 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40015 (1.5 Volts Out)
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
0.90
0.85
0.80
72 V
48 V
36 V
70 C
55 C
40 C
0.75
0.70
0.65
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 1.5V.3: Efficiency vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to pin 1
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.5V.4: Efficiency vs. load current and ambient tempera-
ture for converter mounted vertically with Vin = 48 V and air
flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
16.00
12.00
8.00
16.00
12.00
8.00
70 C
55 C
40 C
72 V
48 V
36 V
4.00
4.00
0.00
0.00
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 1.5V.6: Power dissipation vs. load current and ambient
temperature for converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0
m/s).
Fig. 1.5V.5: Power dissipation vs. load current and input volt-
age for converter mounted vertically with air flowing from pin 3
to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
NOV 13, 2006 revised to MAR 28, 2007
Page 25 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40015 (1.5 Volts Out)
Fig. 1.5V.8: Turn-on transient at full rated load current (resis-
tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (0.5 V/div.). Time scale: 2 ms/div.
Fig. 1.5V.7: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (0.5 V/div.) Time scale: 2 ms/div.
Fig. 1.5V.10: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 μF tantalum +
1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.
Fig. 1.5V.9: Output voltage response to load current step-
change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div).
Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-
ramic. Time scale: 0.2 ms/div.
NOV 13, 2006 revised to MAR 28, 2007
Page 26 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40015 (1.5 Volts Out)
iS
iC
10 μH
source
inductance
TM Series
33 μF
ESR <1
electrolytic
capacitor
1 μF
ceramic
capacitor
QmaX
DC/DC
Converter
Vout
Vsource
Fig. 1.5V.11: Test setup for measuring input reflected ripple currents, ic and is.
Fig. 1.5V.12: Input reflected ripple current, is (10 mA/div),
measured through 10 μH at the source at full rated load cur-
rent and Vin = 48 V. Refer to Fig. 1.5V.11 for test setup.
Time scale: 1μs/div.
Fig. 1.5V.14: Input reflected ripple current, ic (100 mA/div),
measured at input terminals at full rated load current and Vin
= 48 V. Refer to Fig. 1.5V.11 for test setup. Time scale: 1
μs/div.
2.0
1.5
1.0
0.5
0
60
0
15
30
45
Iout [Adc]
Fig. 1.5V.15: Load current (top trace, 20 A/div, 20 ms/div)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-
tom trace (20 A/div, 1 ms/div) is an expansion of the on-time
portion of the top trace.
Fig. 1.5V.13: Output voltage vs. load current showing cur-
rent limit point and converter shutdown point. Input voltage
has almost no effect on current limit characteristic.
NOV 13, 2006 revised to MAR 28, 2007
Page 27 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Electrical Specifications: QM48S40012 (1.2 Volts Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.2 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
40 Adc, 1.2 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
1.7
Adc
mAdc
mAdc
mAPK-PK
dB
3
28
7.5
TBD
120Hz
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
1.188
1.176
1.200
1.212
Vdc
±1
±1
±3
±3
1.224
50
40,000
40
52
mV
mV
Vdc
mVPK-PK
μF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 μF tantalum + 1 μF ceramic
Plus full load (resistive)
30
0
42
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
60
15
Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 1 A/μS
Setting Time to 1%
Co = 470 μF tantalum + 1 μF ceramic
120
250
mV
µs
EFFICIENCY
100% Load
50% Load
83
86.5
%
%
Additional Notes: 2. -40ºC to 85ºC
50
50
40
30
40
30
20
10
0
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
20
10
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 1.2V.1: Available load current vs. ambient air temperature
and airflow rates for QM48S40012 converter mounted verti-
cally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
Fig. 1.2V.2: Available load current vs. ambient air temperature
and airflow rates for QM48S40012 converter mounted horizon-
tally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
NOV 13, 2006 revised to MAR 28, 2007
Page 28 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40012 (1.2 Volts Out)
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
0.90
0.85
0.80
72 V
48 V
36 V
70 C
55 C
40 C
0.75
0.70
0.65
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 1.2V.3: Efficiency vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to pin 1
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.2V.4: Efficiency vs. load current and ambient tempera-
ture for converter mounted vertically with Vin = 48 V and air
flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
16.00
12.00
8.00
16.00
12.00
8.00
72 V
48 V
36 V
70 C
55 C
40 C
4.00
4.00
0.00
0.00
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 1.2V.5: Power dissipation vs. load current and input volt-
age for converter mounted vertically with air flowing from pin 3
to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.2V.6: Power dissipation vs. load current and ambient
temperature for converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0
m/s).
NOV 13, 2006 revised to MAR 28, 2007
Page 29 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40012 (1.2 Volts Out)
Fig. 1.2V.7: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (0.5 V/div.) Time scale: 2 ms/div.
Fig. 1.2V.8: Turn-on transient at full rated load current (resis-
tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (0.5 V/div.). Time scale: 2 ms/div.
Fig. 1.2V.9: Output voltage response to load current step-
change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div).
Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-
ramic. Time scale: 0.2 ms/div.
Fig. 1.2V.10: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 μF tantalum +
1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.
NOV 13, 2006 revised to MAR 28, 2007
Page 30 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40012 (1.2 Volts Out)
iS
iC
10 μH
source
inductance
TM Series
33 μF
ESR <1
electrolytic
capacitor
1 μF
ceramic
capacitor
QmaX
DC/DC
Converter
Vout
Vsource
Fig. 1.2V.11: Test setup for measuring input reflected ripple currents, ic and is.
Fig. 1.2V.12: Input reflected ripple current, is (10 mA/div),
measured through 10 μH at the source at full rated load cur-
rent and Vin = 48 V. Refer to Fig. 1.2V.11 for test setup.
Time scale: 1μs/div.
Fig. 1.2V.14: Input reflected ripple current, ic (100 mA/div),
measured at input terminals at full rated load current and Vin
= 48 V. Refer to Fig. 1.2V.11 for test setup. Time scale: 1
μs/div.
1.5
1.0
0.5
0
60
0
15
30
45
Iout [Adc]
Fig. 1.2V.15: Load current (top trace, 20 A/div, 20 ms/div)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-
tom trace (20 A/div, 1 ms/div) is an expansion of the on-time
portion of the top trace.
Fig. 1.2V.13: Output voltage vs. load current showing cur-
rent limit point and converter shutdown point. Input voltage
has almost no effect on current limit characteristic.
NOV 13, 2006 revised to MAR 28, 2007
Page 31 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Electrical Specifications: QM48S40010 (1.0 Volt Out)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, Vout=1.0 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
40 Adc, 1.0 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25MHz bandwidth
1.4
Adc
mAdc
mAdc
mAPK-PK
dB
3
27
7.5
TBD
120Hz
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
0.990
0.980
1.000
1.010
Vdc
±1
±1
±3
±3
1.020
50
40,000
40
52
mV
mV
Vdc
mVPK-PK
μF
Adc
Adc
A
Over line, load and temperature2
Full load + 10 μF tantalum + 1 μF ceramic
Plus full load (resistive)
30
0
42
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
60
15
Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 1 A/μS
Setting Time to 1%
Co = 470 μF tantalum + 1 μF ceramic
120
280
mV
µs
EFFICIENCY
100% Load
50% Load
81
85
%
%
Additional Notes: 2. -40ºC to 85ºC
50
50
40
30
40
30
20
10
0
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
20
10
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 1.0V.1: Available load current vs. ambient air temperature
and airflow rates for QM48S40010 converter mounted verti-
cally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
Fig. 1.0V.2: Available load current vs. ambient air temperature
and airflow rates for QM48S40010 converter mounted horizon-
tally with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
NOV 13, 2006 revised to MAR 28, 2007
Page 32 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40010 (1.0 Volt Out)
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
0.90
0.85
0.80
72 V
48 V
36 V
70 C
55 C
40 C
0.75
0.70
0.65
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 1.0V.3: Efficiency vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to pin 1
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.0V.4: Efficiency vs. load current and ambient tempera-
ture for converter mounted vertically with Vin = 48 V and air
flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
16.00
12.00
8.00
16.00
12.00
8.00
72 V
48 V
36 V
70 C
55 C
40 C
4.00
4.00
0.00
0.00
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
Fig. 1.0V.5: Power dissipation vs. load current and input volt-
age for converter mounted vertically with air flowing from pin 3
to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
Fig. 1.0V.6: Power dissipation vs. load current and ambient
temperature for converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0
m/s).
NOV 13, 2006 revised to MAR 28, 2007
Page 33 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40010 (1.0 Volt Out)
Fig. 1.0V.7: Turn-on transient at full rated load current (resis-
tive) with no output capacitor at Vin = 48 V, triggered via
ON/OFF pin. Top trace: ON/OFF signal (5 V/div.). Bottom
trace: output voltage (0.5 V/div.) Time scale: 2 ms/div.
Fig. 1.0V.8: Turn-on transient at full rated load current (resis-
tive) plus 40,000 μF at Vin = 48 V, triggered via ON/OFF pin.
Top trace: ON/OFF signal (5 V/div.). Bottom trace: output volt-
age (0.5 V/div.). Time scale: 2 ms/div.
Fig. 1.0V.9: Output voltage response to load current step-
change (20 A – 30 A – 20 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div).
Current slew rate: 1 A/μs. Co = 470 μF tantalum + 1 μF ce-
ramic. Time scale: 0.2 ms/div.
Fig. 1.0V.10: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 μF tantalum +
1uF ceramic and Vin = 48 V. Time scale: 1 μs/div.
NOV 13, 2006 revised to MAR 28, 2007
Page 34 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
QM48S40010 (1.0 Volt Out)
iS
iC
10 μH
source
inductance
TM Series
33 μF
ESR <1
electrolytic
capacitor
1 μF
ceramic
capacitor
QmaX
DC/DC
Converter
Vout
Vsource
Fig. 1.0V.11: Test setup for measuring input reflected ripple currents, ic and is.
Fig. 1.0V.12: Input reflected ripple current, is (10 mA/div),
measured through 10 μH at the source at full rated load cur-
rent and Vin = 48 V. Refer to Fig. 1.0V.11 for test setup.
Time scale: 1μs/div.
Fig. 1.0V.14: Input reflected ripple current, ic (100 mA/div),
measured at input terminals at full rated load current and Vin
= 48 V. Refer to Fig. 1.0V.11 for test setup. Time scale: 1
μs/div.
1.5
1.0
0.5
0
60
0
15
30
45
Iout [Adc]
Fig. 1.0V15: Load current (top trace, 20 A/div, 20 ms/div)
into a 10 mΩ short circuit during restart, at Vin = 48 V. Bot-
tom trace (20 A/div, 1 ms/div) is an expansion of the on-time
portion of the top trace.
Fig. 1.0V13: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has
almost no effect on current limit characteristic.
NOV 13, 2006 revised to MAR 28, 2007
Page 35 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Physical Information
Pin Connections
Pin #
Function
Vin (+)
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
SENSE(+)
Vout (+)
1
2
3
4
5
6
7
8
1
8
7
6
5
4
2
3
TOP VIEW
SIDE VIEW
QM48S Platform Notes
•
•
•
•
•
All dimensions are in inches [mm]
Connector Material: Copper
Connector Finish: Gold over Nickel
Converter Weight: 1.06oz [30 g]
Recommended Surface-Mount Pads:
Min. 0.080” X 0.112” [2.03 x 2.84]
Max. 0.092” X 0.124” [2.34 x 3.15]
Converter Part Numbering Scheme
Rated
Load
Current
Product
Series
Input
Voltage
Mounting
Scheme
Output
Voltage
ON/OFF
Logic
Maximum
Height (HT)
Pin
Length (PL)
Special
Features
48
S
40
033
-
N
0
0
QM
S
0 ⇒ STD
010 ⇒ 1.0 V
012 ⇒ 1.2 V
015 ⇒ 1.5 V
018 ⇒ 1.8 V
020 ⇒ 2.0 V
025 ⇒ 2.5 V
033 ⇒ 3.3 V
U ⇒ Special
Trim2
Quarter-Brick
Format
Surface
Mount
40 A
(1.0 - 3.3 V)
N ⇒ Negative
P ⇒ Positive
(For 1.2V only)
36-75 V
S ⇒ 0.295”
0 ⇒ 0.00”
T ⇒ Special
Trim2
(For 1.2V &
1.0V only)
1. The example above describes P/N QM48T40033-NS00: 36-75 V input, surface mount, 40 A @ 3.3 V output, negative ON/OFF logic, a maximum height
of 0.295”. Please consult factory regarding availability of a specific version.
2. For definitions, operation, and associated trim equations for all trim options please refer to Application Note 103, Trim Feature for Isolated dc-dc.
Models highlighted in yellow or shaded are not recommended for new designs.
RoHS Ordering Information:
•
•
No RoHS suffix character is required for lead-solder-exemption compliance.
For RoHS compliance to all six substances, add the letter "G" as the last letter of the part number.
NOV 13, 2006 revised to MAR 28, 2007
Page 36 of 37
www.power-one.com
QM48S DC-DC Converter Series Data Sheet
40A Output
Fig. H: Location of the thermocouple for thermal testing.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as components in life support
systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of
Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date
manufactured. Specifications are subject to change without notice.
NOV 13, 2006 revised to MAR 28, 2007
Page 37 of 37
www.power-one.com
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