QM48T40010-PBBT [BEL]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid;
| 型号： | QM48T40010-PBBT |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid |
| 文件： | 总38页 (文件大小：697K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QM48 Series - 40A
Data Sheet
The QmaXTM Series of high current single output DC/DC
converters from di/dt sets new standards for thermal per-
formance and power density in the quarter brick package.
The 40A QM48 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.
QM48T40 Converters
The QM48T40 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
QM48T40 converter from di/dt.
Features
•
•
•
Delivers up to 40 A (132 W)
Industry-standard quarter brick pinout
Higher current capability at 70ºC than most com-
petitors’ 40 A half bricks
Low body profile and the preclusion of heatsinks minimize
impedance to system airflow, thus enhancing cooling for
downstream devices. The use of 100% automation for as-
sembly, coupled with di/dt’s advanced electric and thermal
design, results in a product with extremely high reliability.
•
•
•
•
•
•
•
•
•
•
•
•
•
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 heatsink required
Start up into pre-biased output
No minimum load required
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.
Lowest profile in industry: 0.31” [7.9 mm]
Lowest weight in industry: 1.06 oz [30 g] typical
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%)
Applications
•
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 recognized in US and Canada and DEMKO
certified per IEC/EN 60950 (pending)
•
•
•
Telecommunications
Data communications
Wireless
•
•
•
Servers
•
•
Meets conducted emissions requirements of FCC
Class B and EN 55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
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Page 1 of 38
QM48 Series - 40A
Data Sheet
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
Continuous
0
-40
-55
80
85
125
Vdc
°C
°C
Operating Ambient Temperature
Storage Temperature
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
36
48
75
Vdc
Non-latching
100 ms
33
31
34
32
35
33
100
Vdc
Vdc
Vdc
Turn-off Threshold
Input Voltage Transient
ISOLATION CHARACTERISTICS
I/O Isolation
2000
10
Vdc
nF
MΩ
Isolation Capacitance
Isolation Resistance
1.4
FEATURE CHARACTERISTICS
Switching Frequency
415
kHz
%
Output Voltage Trim Range1
-20
-10
+10
+10
+10
140
Industry-std. equations (3.3 -
%
Use trim equation on Page 4 (1.2 - 1.0 V)
Remote Sense Compensation1
Output Over-Voltage Protection
Over-Temperature Shutdown (PCB)
Auto-Restart Period
Percent of VOUT(NOM)
%
%
°C
ms
ms
Non-latching
Non-latching
117
128
125
100
4
Applies to all protection features
Turn-On Time
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.
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QM48 Series - 40A
Data Sheet
age of ≤ 0.8 V. An external voltage source of ±20 V max.
may be connected directly to the ON/OFF input, in which
case it should be capable of sourcing or sinking (depending
on the signal polarity) up to 1 mA. 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)
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
3.3V – 1.0 V outputs.
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).
TM Series
Rw
QmaX
Vout (+)
100
SENSE (+)
Vin (+)
ON/OFF
Vin (-)
Converter
(Top View)
ON/OFF (Pin 2)
Rload
TRIM
Vin
SENSE (-)
10
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.
Vout (-)
Rw
Fig. B: Remote sense circuit configuration.
TM Series
QmaX
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
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.
Converter
(Top View)
Rload
Vin
SENSE (-)
Vout (-)
CONTROL
INPUT
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.
Fig. A: Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF pin is
at logic high and turns off when at logic low. The converter is
on when the ON/OFF pin is left open.
The negative logic version turns on when the pin is at logic
low and turns off when the pin is at 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.
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.
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-
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QM48 Series - 40A
Data Sheet
When using remote sense, the output voltage at the con-
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.
QmaXTM Series
Converter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
(Top View)
R T-INCR
Rload
Vin
SENSE (-)
Vout (-)
Output Voltage Adjust /TRIM (Pin 6)
Fig. C: Configuration for increasing output voltage.
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.
To decrease the output voltage (Fig. D), a trim resistor,
RT-DECR, should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
511
RT−DECR
RT−DECR
RT−DECR
=
=
=
−10.22
− 15
[kΩ] (For 3.3V - 1.5V)
[kΩ] (1.2V)
| ∆ |
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.
700
| ∆ |
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:
700
| ∆ |
− 17
[kΩ] (1.0V)
where,
5.11(100 + ∆)VO−NOM − 626
RT−DECR = Required value of trim-down resistor [kΩ]
and ∆ is as defined above.
R
R
R
T−INCR
=
=
=
− 10.22 [kΩ](3.3V-1.5V)
[kΩ] (1.2V)
1.225∆
84.6
∆
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).
T−INCR
T−INCR
− 7.2
120
∆
− 9
[kΩ] (1.0V)
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.
where,
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:
RT−INCR = Required value of trim-up resistor [kΩ]
VO−NOM = Nominal value of output voltage [V]
485
(VO-REQ − VO-NOM)
RT−INCR =
RT−INCR =
RT−DECR =
[kΩ] (1.2V)
∆ =
X 100 [%]
∆
VO -NOM
323
∆
− 2
[kΩ] (1.0V)
VO−REQ = Desired (trimmed) output voltage [V].
511
| ∆ |
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.
− 10.22
[kΩ] (For 1.2V and 1.0V)
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QM48 Series - 40A
Data Sheet
Protection Features
Input Under-Voltage Lockout
For 1.2V only, “U” version converter with the last character in
the part number “U” uses the following trim equations:
100
Input under-voltage lockout is standard with this converter.
The converter will shut down when the input voltage drops
below a pre-determined voltage.
RT−INCR =
[kΩ]
[kΩ]
∆
100
| ∆ |
RT−DECR =
− 2
The input voltage must be at least 35 V for the converter to
turn on. Once the converter has been turned on, it will shut
off when the input voltage drops below 31 V. This feature is
beneficial in preventing deep discharging of batteries used in
telecom applications.
TM Series
QmaX
Vin (+)
Vout (+)
SENSE (+)
TRIM
Converter
Output Over-Current Protection (OCP)
(Top View)
Rload
ON/OFF
Vin (-)
The converter is protected against over-current 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 60% of the nominal value of output volt-
age, the converter will shut down.
Vin
RT-DECR
SENSE (-)
Vout (-)
Fig. D: Configuration for decreasing output voltage.
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 60% of its nominal value.
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:
Output Over-Voltage Protection (OVP)
The converter will shut down if the output voltage across
Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of
the OVP circuitry. The OVP circuitry contains its own refer-
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.
[VOUT(+) − VOUT(−)]−[VSENSE(+) − VSENSE(−)] ≤ VO - NOM X10% [V]
This equation is applicable for any condition of output sens-
ing and/or output trim.
Over-Temperature Protection (OTP)
The converter will shut down under an over-temperature
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.
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QM48 Series - 40A
Data Sheet
Safety Requirements
Characterization
The converters meet North American and International
safety regulatory requirements per UL60950 and EN60950
(pending). Basic Insulation is provided between input and
output.
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.
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.
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.
Output Voltage
3.3 V
Fuse Rating
2.5 -1.8 V
1.5 - 1.0 V
The following pages contain specific plots or waveforms as-
sociated with the converter. Additional comments for specific
data are provided below.
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.
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.
Electromagnetic Compatibility (EMC)
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, di/dt tests its converters to several system level
standards, primary of which is the more stringent EN55022,
Information technology equipment - Radio disturbance char-
acteristics - Limits and methods of measurement.
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.
Effective internal LC differential filter significantly reduces
input reflected ripple current, and improves EMC.
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 di/dt Applications Engineering for details of this test-
ing.
All measurements requiring airflow were made in di/dt’s ver-
tical and horizontal wind tunnel facilities using Infrared (IR)
thermography and thermocouples for thermometry.
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. di/dt recommends
the use of AWG #40 gauge thermocouples to ensure meas-
urement accuracy. Careful routing of the thermocouple leads
will further minimize measurement error. Refer to Figure H
for optimum measuring thermocouple location.
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QM48 Series - 40A
Data Sheet
Thermal Derating
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.
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
and 85°C, with airflow rates from 30 to 500 LFM (0.15 to 2.5
m/s).
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.
For each set of conditions, the maximum load current was
defined as the lowest of:
(i) The output current at which either any FET junction tem-
perature did 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 or equal to 120°C should not be exceeded.
Temperature on the PCB at the thermocouple location
shown in Fig. H should not exceed 118°C in order to operate
inside the derating curves.
Efficiency
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.
Fig. H: Location of the thermocouple for thermal testing.
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.
Start-up
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.
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QM48 Series - 40A
Start-up Information (using negative ON/OFF)
Data Sheet
VIN
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure E.
ON/OFF
STATE
Time
Comments
OFF
ON
t0
ON/OFF pin is ON; system front end power is toggled
on, VIN to converter begins to rise.
t1
t2
t3
VIN crosses Under-Voltage Lockout protection circuit
threshold; converter enabled.
VOUT
Converter begins to respond to turn-on command (con-
verter 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.
t
t0
t1 t2
t3
Fig. E: Start-up scenario #1.
VIN
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure F.
Time
Comments
t0
t1
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
Comments
Fig. F: Start-up scenario #2.
t0
t1
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.
100 ms
If (t2- t1) > 100 ms, ON/OFF pin action is internally
enabled.
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.
VOUT
Converter VOUT reaches 100% of nominal value.
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.
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QM48 Series - 40A
Data Sheet
Electrical Specifications: QM48T40033 (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
-40ºC to 85ºC
3.267
3.250
3.300
3.333
Vdc
Over Line
±2
±2
±5
±5
3.350
50
mV
mV
Vdc
mVPK-PK
µF
Over Load
Output Voltage Range
Over line, load and temperature
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
30
40,000
40
0
42
Adc
Adc
A
Current Limit Inception
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
52
Peak Short-Circuit Current
60
RMS Short-Circuit Current
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
90.5
92.5
%
%
50% Load
50
40
30
20
10
0
50
40
30
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
Fig. 3.3V.1: Available load current vs. ambient air temperature
and airflow rates for QM48T40033 converter with B height pins
mounted vertically 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 QM48T40033 converter with B height pins
mounted horizontally with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
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QM48 Series - 40A
Data Sheet
QM48T40033 (3.3 Volts Out)
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
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
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).
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QM48 Series - 40A
Data Sheet
QM48T40033 (3.3 Volts Out)
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.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. 3.3V9: 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.
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.
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QM48 Series - 40A
Data Sheet
QM48T40033 (3.3 Volts Out)
iS
iC
10 µH
source
TM
33 µF
1 µF
Series
QmaX
inductance
Ω
ESR <1
ceramic
capacitor
DC/DC
Vout
electrolytic
capacitor
Converter
Vsource
Fig. 3.3V.11: Test Set-up 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.
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QM48 Series - 40A
Data Sheet
Electrical Specifications: QM48T40025 (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
-40ºC to 85ºC
2.475
2.462
2.500
2.525
Vdc
Over Line
±2
±2
±5
±5
2.538
50
mV
mV
Vdc
mVPK-PK
µF
Over Load
Output Voltage Range
Over line, load and temperature
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
30
40,000
40
0
42
Adc
Adc
A
Current Limit Inception
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
52
Peak Short-Circuit Current
60
RMS Short-Circuit Current
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
89
91
%
%
50% Load
50
40
30
20
10
0
50
40
30
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
Fig. 2.5V.1: Available load current vs. ambient air temperature
and airflow rates for QM48T40025 converter with B height pins
mounted vertically 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 QM48T40025 converter with B height pins
mounted horizontally with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
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QM48 Series - 40A
Data Sheet
QM48T40025 (2.5 Volts Out)
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
0.90
0.85
0.80
0.75
0.70
0.65
72 V
48 V
36 V
70 C
55 C
40 C
0
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
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.
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).
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).
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QM48 Series - 40A
Data Sheet
QM48T40025 (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.
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QM48 Series - 40A
Data Sheet
QM48T40025 (2.5 Volts Out)
iS
iC
10 µH
source
TM
33 µF
1 µF
Series
QmaX
inductance
Ω
ESR <1
ceramic
capacitor
DC/DC
Vout
electrolytic
capacitor
Converter
Vsource
Fig. 2.5V.11: Test Set-up 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.
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QM48 Series - 40A
Data Sheet
Electrical Specifications: QM48T40020 (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
-40ºC to 85ºC
1.98
2.000
2.02
Vdc
Over Line
±2
±2
±5
±5
2.030
50
mV
mV
Vdc
mVPK-PK
µF
Over Load
Output Voltage Range
Over line, load and temperature
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
1.970
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
30
40,000
40
0
42
Adc
Adc
A
Current Limit Inception
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
52
Peak Short-Circuit Current
60
RMS Short-Circuit Current
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
88
90
%
%
50% Load
50
40
30
20
10
0
50
40
30
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
Fig. 2.0V.1: Available load current vs. ambient air temperature
and airflow rates for QM48T40020 converter with B height pins
mounted vertically 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 QM48T40020 converter with B height pins
mounted horizontally with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
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QM48 Series - 40A
Data Sheet
QM48T40020 (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
0.75
0.70
0.65
72 V
48 V
36 V
70 C
55 C
40 C
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).
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QM48 Series - 40A
Data Sheet
QM48T40020 (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.
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QM48 Series - 40A
Data Sheet
QM48T40020 (2.0 Volts Out)
iS
iC
10 µH
source
TM
33 µF
1 µF
Series
QmaX
inductance
Ω
ESR <1
ceramic
capacitor
DC/DC
Vout
electrolytic
capacitor
Converter
Vsource
Fig. 2.0V.11: Test Set-up 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.
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QM48 Series - 40A
Data Sheet
Electrical Specifications: QM48T40018 (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
-40ºC to 85ºC
1.782
1.773
1.800
1.818
Vdc
Over Line
±2
±2
±4
±5
1.827
50
mV
mV
Vdc
mVPK-PK
µF
Over Load
Output Voltage Range
Over line, load and temperature
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
30
40,000
40
0
42
Adc
Adc
A
Current Limit Inception
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
52
Peak Short-Circuit Current
60
RMS Short-Circuit Current
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
87
89.5
%
%
50% Load
50
40
30
20
10
0
50
40
30
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
Fig. 1.8V.1: Available load current vs. ambient air temperature
and airflow rates for QM48T40018 converter with B height pins
mounted vertically 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 QM48T40018 converter with B height pins
mounted horizontally with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
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QM48 Series - 40A
Data Sheet
QM48T40018 (1.8 Volts Out)
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
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
10
20
30
40
50
0
10
20
30
40
50
Load Current [Adc]
Load Current [Adc]
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.
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).
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.
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QM48 Series - 40A
Data Sheet
QM48T40018 (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.
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QM48 Series - 40A
Data Sheet
QM48T40018 (1.8 Volts Out)
iS
iC
10 µH
source
TM
33 µF
1 µF
Series
QmaX
inductance
Ω
ESR <1
ceramic
capacitor
DC/DC
Vout
electrolytic
capacitor
Converter
Vsource
Fig. 1.8V.11: Test Set-up 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.
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QM48 Series - 40A
Data Sheet
Electrical Specifications: QM48T40015 (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
-40ºC to 85ºC
1.485
1.477
1.500
1.515
Vdc
Over Line
±2
±2
±4
±4
1.523
50
mV
mV
Vdc
mVPK-PK
µF
Over Load
Output Voltage Range
Over line, load and temperature
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
30
40,000
40
0
42
Adc
Adc
A
Current Limit Inception
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
52
Peak Short-Circuit Current
60
RMS Short-Circuit Current
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
85.5
88
%
%
50% Load
50
40
30
20
10
0
50
40
30
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
Fig. 1.5V.1: Available load current vs. ambient air temperature
and airflow rates for QM48T40015 converter with B height pins
mounted vertically 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 QM48T40015 converter with B height pins
mounted horizontally with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
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QM48 Series - 40A
Data Sheet
QM48T40015 (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
0.75
0.70
0.65
72 V
48 V
36 V
70 C
55 C
40 C
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.
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QM48 Series - 40A
Data Sheet
QM48T40015 (1.5 Volts Out)
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.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.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. 1.5V.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.
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QM48 Series - 40A
Data Sheet
QM48T40015 (1.5 Volts Out)
iS
iC
10 µH
source
TM
33 µF
1 µF
Series
QmaX
inductance
Ω
ESR <1
ceramic
capacitor
DC/DC
Vout
electrolytic
capacitor
Converter
Vsource
Fig. 1.5V.11: Test Set-up 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.
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QM48 Series - 40A
Data Sheet
Electrical Specifications: QM48T40012 (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
-40ºC to 85ºC
1.188
1.182
1.200
1.212
Vdc
Over Line
±1
±1
±3
±3
1.218
50
mV
mV
Vdc
mVPK-PK
µF
Over Load
Output Voltage Range
Over line, load and temperature
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
30
40,000
40
0
42
Adc
Adc
A
Current Limit Inception
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
52
Peak Short-Circuit Current
60
RMS Short-Circuit Current
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
83
86.5
%
%
50% Load
50
40
30
20
10
0
50
40
30
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
Fig. 1.2V.1: Available load current vs. ambient air temperature
and airflow rates for QM48T40012 converter with B height pins
mounted vertically 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 QM48T40012 converter with B height pins
mounted horizontally with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
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QM48 Series - 40A
Data Sheet
QM48T40012 (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
0.75
0.70
0.65
72 V
48 V
36 V
70 C
55 C
40 C
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).
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QM48 Series - 40A
Data Sheet
QM48T40012 (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.
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QM48 Series - 40A
Data Sheet
QM48T40012 (1.2 Volts Out)
iS
iC
10 µH
source
TM
33 µF
1 µF
Series
QmaX
inductance
Ω
ESR <1
ceramic
capacitor
DC/DC
Vout
electrolytic
capacitor
Converter
Vsource
Fig. 1.2V.11: Test Set-up 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.
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QM48 Series - 40A
Data Sheet
Electrical Specifications: QM48T40010 (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
-40ºC to 85ºC
0.990
0.985
1.000
1.010
Vdc
Over Line
±1
±1
±3
±3
1.015
50
mV
mV
Vdc
mVPK-PK
µF
Over Load
Output Voltage Range
Over line, load and temperature
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
30
40,000
40
0
42
Adc
Adc
A
Current Limit Inception
Non-latching
Non-latching. Short=10mꢀ.
Non-latching
47
50
10
52
Peak Short-Circuit Current
60
RMS Short-Circuit Current
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
81
85
%
%
50% Load
50
40
30
20
10
0
50
40
30
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
Fig. 1.0V.1: Available load current vs. ambient air temperature
and airflow rates for QM48T40010 converter with B height pins
mounted vertically 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 QM48T40010 converter with B height pins
mounted horizontally with air flowing from pin 3 to pin 1,
MOSFET temperature ≤ 120°C, Vin = 48 V.
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QM48 Series - 40A
Data Sheet
QM48T40010 (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
0.75
0.70
0.65
72 V
48 V
36 V
70 C
55 C
40 C
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).
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QM48 Series - 40A
Data Sheet
QM48T40010 (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.
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QM48 Series - 40A
Data Sheet
QM48T40010 (1.0 Volt Out)
iS
iC
10 µH
source
TM
33 µF
1 µF
Series
QmaX
inductance
Ω
ESR <1
ceramic
capacitor
DC/DC
Vout
electrolytic
capacitor
Converter
Vsource
Fig. 1.0V.11: Test Set-up 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.
QM48T40 Family DS Ver 4 07-08-03
USA Toll Free 866 WOW-didt
Page 36 of 38
QM48 Series - 40A
Data Sheet
Physical Information
Pin Connections
Pin #
Function
Vin (+)
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
SENSE(+)
Vout (+)
1
2
3
4
5
6
7
8
1
2
8
7
6
5
4
TOP VIEW
3
•
•
All dimensions are in inches [mm]
Pins 1-3 and 5-7 are Ø 0.040” [1.02]
with Ø 0.078” [1.98] shoulder
Pins 4 and 8 are Ø 0.062” [1.57]
without shoulder
SIDE VIEW
•
•
•
•
Pin Material: Brass
Pin Finish: Tin/Lead over Nickel
Converter Weight: 1.06 oz [30 g]
typical
HT
CL
PL
Height
Option
(Maximum Height)
(Minimum Clearance)
Pin
(Pin Length)
Option
+0.000 [+0.00]
-0.038 [-0.97]
0.325 [8.26]
0.358 [9.09]
0.422 [10.72]
+0.016 [+0.41]
-0.000 [-0.00]
0.030 [0.77]
0.063 [1.60]
0.127 [3.23]
±0.005 [±0.13]
A
B
D
A
B
C
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
QM48T40 Family DS Ver 4 07-08-03
USA Toll Free 866 WOW-didt
Page 37 of 38
QM48 Series - 40A
Data Sheet
Converter Part Numbering Scheme
Product
Input
Mounting
Rated Load
Output
ON/OFF
Logic
Maximum
Pin
Special
Series
Voltage
Scheme
Current
Voltage
Height (HT)
Length (PL)
Features
QM
48
T
40
033
-
N
A
0
B
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
A ⇒ 0.325”
B ⇒ 0.358”
D ⇒ 0.422”
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
Quarter-
Brick
(For 1.2V
Through-
hole
40 A
N ⇒ Negative
P ⇒ Positive
36-75 V
only)
(1.0V - 3.3V)
Format
T ⇒ Special
Trim2
(For 1.2V &
1.0V only)
1. The example above describes P/N QM48T40033-NBA0: 36-75 V input, through-hole mounting, 40 A @ 3.3 V output, negative ON/OFF logic, a
maximum height of 0.358”, and a through the board pin length of 0.188”. 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
For more infdorim/datt,ioInnpcl.ease contact
1822 Aston Avenue •• Carlsbad, CA •• 92008 •• USA
USA Toll Free 866-WOW-didt (969-3438)
www.didt.com •• support@didt.com
The information and specifications contained in this data sheet are believed to be accurate and reliable at the time of publication. However, di/dt, Inc. assumes no responsibility for its use or for
any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of di/dt, Inc. Specifi-
cations are subject to change without notice.
©Copyright di/dt, Inc. 2003
QM48T40 Family DS Ver 4 07-08-03
USA Toll Free 866 WOW-didt
Page 38 of 38
相关型号：
QM48T40033-NBA0
DC-DC Regulated Power Supply Module, 1 Output, 132W, Hybrid, QUARTER BRICK PACKAGE-8
BEL
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