Q48T08120-PBB0G [BEL]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid;
| 型号： | Q48T08120-PBB0G |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid |
| 文件： | 总14页 (文件大小：328K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
The Q48T08120 through-hole mounted DC/DC converter
offers unprecedented performance in the industry-standard
quarter brick format. This is accomplished through the use of
patent pending circuit and packaging techniques to achieve
ultra-high efficiency, excellent thermal performance and a
very low body profile.
&&
In telecommunications applications theQFamily 8 A con-
verters provide excellent thermal performance. Low body
profile and the preclusion of heat sinks minimize airflow
shadowing, thus enhancing cooling for downstream devices.
The use of 100% surface-mount technologies for assembly,
coupled with Power-One’s advanced electric and thermal
circuitry and packaging, results in a product with extremely
high quality and reliability.
Q48T08120 Converter
Features
10
9
•
RoHS lead-free solder and lead-solder-exempted
products are available
8
7
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Delivers up to 8 A
High efficiency: 89.5% @ 8 A, 89.5% @ 4 A
Start-up into pre-biased output
No minimum load required
No heat sink required
6
5
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)
4
3
Low profile: 0.28” [7.2 mm]
Low weight: 1 oz [28 g] typical
2
1
0
Industry-standard footprint: 1.45” x 2.30”
Industry-standard pinout
Meets Basic Insulation Requirements of EN60950
Withstands 100 V input transient for 100 ms
On-board LC input filter
Fixed-frequency operation
Fully protected
Remote output sense
Output voltage trim range: +10%/-20%
Trim resistor via industry-standard equations
High reliability: MTBF 2.6 million hours, calculated per
Telcordia TR-332, Method I Case 1
Positive or negative logic ON/OFF option
UL 60950 recognized in U.S. & Canada, and DEMKO
certified per IEC/EN 60950
Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 1: Available load current vs. ambient air temperature and air-
flow rates for Q48T08120 converter mounted vertically with air flow-
ing from pin 3 to pin 1, MOSFET temperature ≤ 120°C, Vin = 54 V.
Applications
•
•
•
•
Telecommunications
Data communications
Wireless
•
•
Servers
•
•
JUN 23, 2004 revised to NOV 20, 2006
Page 1 of 14
www.power-one.com
Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
Electrical Specifications
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, 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 Transient Withstand (Susceptibility)
36
48
75
Vdc
Non-latching
100 ms
33
31
34
32
35
33
100
Vdc
Vdc
Vdc
OUTPUT CHARACTERISTICS
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Plus full load (resistive)
2,200
8
11
20
4
µF
Adc
Adc
A
0
9
Non-latching
Non-latching. Short=10mΩ.
Non-latching
10
15
Arms
ISOLATION CHARACTERISTICS
I/O Isolation
Isolation Capacitance
2000
10
Vdc
ρF
Mꢀ
230
435
Isolation Resistance
FEATURE CHARACTERISTICS
Switching Frequency
kHz
%
Output Voltage Trim Range1, 2
Use trim equations on Page 6
Percent of VOUT(NOM)
-20
+10
+10
127
Remote Sense Compensation1
%
Output Over-Voltage Protection
Over-Temperature Shutdown (PCB)
Auto-Restart Period
Non-latching
Non-latching
Applies to all protection features
117
122
118
100
4
%
°C
ms
ms
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. See further discussion at end of
Output Voltage Adjust /TRIM section.
2. The output voltage can be trimmed down to 8V, using the trim equations on page 6, without deteriorating electrical parameters and derating
plots. With 1% external trimming resistor, the output voltage set point accuracy will be +/-1.6% (worst case).
JUN 23, 2004 revised to NOV 20, 2006
Page 2 of 14
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Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
Electrical Specifications (continued)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=48 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
8 Adc, 12 Vdc Out @ 36 Vdc In
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
See Figure 25 - 25MHz bandwidth
120Hz
3
Adc
mAdc
mAdc
mAPK-PK
dB
2.5
65
6
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
-40ºC to 85ºC
11.880
11.820
12.000
12.120
Vdc
Over Line
Over Load
±4
±4
±10
±10
12.180
80
mV
mV
Vdc
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
Over line, load and temperature
Full load + 10 µF tantalum + 1 µF ceramic
50
mVPK-PK
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS
di/dt = 5 A/µS
Co = 1 µF ceramic (Fig.20)
Co = 450 µF tant. + 1 µF ceramic (Fig.21)
200
200
500
mV
mV
µs
Setting Time to 1%
EFFICIENCY
100% Load
50% Load
89.5
89.5
%
%
JUN 23, 2004 revised to NOV 20, 2006
Page 3 of 14
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Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
Physical Information
1
2
8
7
6
5
4
Pin Connections
Pin #
Function
Vin (+)
TOP VIEW
1
2
3
4
5
6
7
8
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
3
SIDE VIEW
SENSE(+)
Vout (+)
•
•
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
•
•
•
•
Pin Material: Brass
Pin Finish: Tin/Lead over Nickel
Converter Weight: 1 oz [28 g] typical
HT
CL
PL
Height
Option
(Maximum Height)
(Minimum Clearance)
Pin
Option
(Pin Length)
+0.000 [+0.00]
-0.038 [-0.97]
0.303 [7.69]
0.336 [8.53]
0.500 [12.70]
0.400 [10.16]
+0.016 [+0.41]
-0.000 [-0.00]
0.030 [0.77]
0.063 [1.60]
0.227 [5.77]
0.127 [3.23]
±0.005 [±0.13]
A
B
C
D
A
B
C
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
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
T
08
120
-
N
A
0
Q
B
A ⇒ 0.303”
B ⇒ 0.336”
C ⇒ 0.500”
D ⇒ 0.400”
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
Quarter-Brick
Format
Through-
hole
N ⇒ Negative
P ⇒ Positive
36-75 V
8 Adc
120 ⇒ 12 V
0 ⇒ STD
The example above describes P/N Q48T08120-NBA0: 36-75 V input, through-hole mounting, 8 A @ 12 V output, negative ON/OFF logic, a
maximum height of 0.336”, and a through the board pin length of 0.188”. Please consult factory regarding availability of a specific version.
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.
JUN 23, 2004 revised to NOV 20, 2006
Page 4 of 14
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Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
may be connected directly to the ON/OFF input, in which
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)
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 2,200 µF.
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. 3).
TM
Rw
Family
Q
Vout (+)
Vin (+)
Converter
100
SENSE (+)
(Top View)
ON/OFF (Pin 2)
Rload
ON/OFF
Vin (-)
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. 2.
Vout (-)
Rw
Fig. 3: Remote sense circuit configuration.
TM
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.
Family
Q
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
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. 2: 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)
JUN 23, 2004 revised to NOV 20, 2006
Page 5 of 14
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Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
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.
511
R
T−DECR
=
− 10.22 [kΩ]
∆
where,
TM
Family
Q
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
(Top View)
R T-INCR
Rload
Vin
SENSE (-)
Vout (-)
Output Voltage Adjust /TRIM (Pin 6)
The converter’s output voltage can be adjusted up 10% or
down 20% relative to the rated output voltage by the addition
of an externally connected resistor. The output voltage can
be trimmed down to 8V, using the trim equations below,
without deteriorating electrical parameters and derating
plots. With 1% external trimming resistor, the output voltage
set point accuracy will be +/-1.6% (worst case).
Fig. 4: Configuration for increasing output voltage.
RT−DECR = Required value of trim-down resistor [kΩ]
and ∆ is as defined above.
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter bricks.
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.
To increase the output voltage, refer to Fig. 4. A trim resistor,
R
T-INCR, should be connected between the TRIM (Pin 6) and
TM
Family
Q
SENSE(+) (Pin 7), with a value of:
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Converter
(Top View)
Rload
Vin
RT-DECR
5.11(100 + ∆)VO−NOM − 626
SENSE (-)
Vout (-)
R
T−INCR
=
− 10.22 [kΩ]
1.225∆
where,
RT−INCR = Required value of trim-up resistor kΩ]
VO−NOM = Nominal value of output voltage [V]
Fig. 5: Configuration for decreasing output voltage.
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 1.20 V, or:
(VO-REQ − VO-NOM)
∆ =
X 100 [%]
VO -NOM
VO−REQ = Desired (trimmed) output voltage [V].
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.
[VOUT(+) − VOUT(−)]−[VSENSE(+) − VSENSE(−)] ≤ 1.20 [V]
This equation is applicable for any condition of output sens-
ing and/or output trim.
To decrease the output voltage (Fig. 5), a trim resistor,
RT-DECR, should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
JUN 23, 2004 revised to NOV 20, 2006
Page 6 of 14
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Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
Protection Features
Safety Requirements
Input Undervoltage Lockout
The converters meet North American and International
safety regulatory requirements per UL60950 and EN60950.
Basic Insulation is provided between input and output.
Input undervoltage lockout is standard with this converter.
The converter will shut down when the input voltage drops
below a pre-determined voltage.
To comply with safety agencies requirements, an input line
fuse must be used external to the converter. A 5-A fuse is
recommended for use with this product.
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.
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, 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.
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent or short cir-
cuit conditions. Upon sensing an overcurrent condition, the
converter will switch to constant current operation and
thereby begin to reduce output voltage. When the output
voltage drops below 6 Vdc, the converter will shut down (Fig.
26).
With the addition of a simple external filter (see application
notes), all versions of the Q48T08 converters pass the re-
quirements of Class B conducted emissions per EN55022
and FCC, and meet at a minimum, Class A radiated emis-
sions per EN 55022 and Class B per FCC Title 47CFR, Part
15-J. Please contact Power-One Applications Engineering
for details of this testing.
Once the converter has shut down, it will attempt to restart
nominally every 100 ms with a 3% duty cycle (Fig. 27). The
attempted restart will continue indefinitely until the overload
or short circuit conditions are removed or the output voltage
rises above 6 Vdc.
Input Transient Withstand
Output Overvoltage Protection (OVP)
This family of converters meets the input transient withstand
requirements of Bellcore GR-513 (Section 13, Table 4.2) as
shown in Fig. 6, and also withstands 100 V input transient for
100 ms.
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.
Transient Duration
5 seconds
10 ms
Vdc
-65
-75
Overtemperature Protection (OTP)
-100
-200
10 µs
1µs
The converter will shut down under an overtemperature con-
dition to protect itself from overheating caused by operation
outside the thermal derating curves, or operation in abnor-
mal conditions such as system fan failure. After the con-
verter has cooled to a safe operating temperature, it will
automatically restart.
Fig. 6: Input transient withstand capability per Bellcore GR-513.
(Negative signs imply telecom transients relative to Vin(+) terminal)
JUN 23, 2004 revised to NOV 20, 2006
Page 7 of 14
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Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
tween 25°C and 85°C, with airflow rates from 30 to 500 LFM
(0.15 to 2.5 m/s), and vertical and horizontal converter
mounting.
Characterization
General Information
For each set of conditions, the maximum load current was
defined as the lowest of:
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 (either
105°C or 120°C) as indicated by the thermographic image,
or
(ii) The nominal rating of the converter (8 A)
The following pages contain specific plots or waveforms as-
sociated with the converter. Additional comments for specific
data are provided below.
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. 28 should not exceed 118°C in order to
operate inside the derating curves.
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.
Efficiency
Efficiency vs. load current plots are shown in Figs. 14 and 16
for ambient temperature of 25ºC, airflow rate of 300 LFM
(1.5 m/s), both vertical and horizontal orientations, and input
voltages of 36 V, 54 V and 72 V. Also, plots of efficiency vs.
load current, as a function of ambient temperature with Vin =
54 V, airflow rate of 200 LFM (1 m/s) are shown for both a
vertically and horizontally mounted converter in Figs. 15 and
17, respectively.
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.
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.
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 2,200 µF load capacitance in
Figs. 18 and 19, 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 28 for optimum measuring thermocouple location.
Ripple and Noise
Figure 22 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. 23. The corresponding
waveforms are shown in Figs. 24 and 25.
Thermal Derating
Load current vs. ambient temperature and airflow rates are
given in Figs. 10-13. Ambient temperature was varied be-
JUN 23, 2004 revised to NOV 20, 2006
Page 8 of 14
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Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
VIN
Start-up Information (using negative ON/OFF)
Scenario #1: Initial Start-up From Bulk Supply
ON/OFF function enabled, converter started via application of VIN.
See Figure 7.
ON/OFF
STATE
OFF
Time
t0
Comments
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.
Converter begins to respond to turn-on command (con-
verter turn-on delay).
ON
VOUT
Converter VOUT reaches 100% of nominal value.
For this example, the total converter start-up time (t3- t1) is typically
4 ms.
t
t
t
t0
t1 t2
t3
Fig. 7: 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 8.
Time
t0
t1
Comments
VINPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
ON/OFF
STATE
OFF
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.
ON
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 9.
t0
t1 t2
t3
Time
Comments
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.
Fig. 8: Start-up scenario #2.
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 8.
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.
t0
t1
t2
t3 t4
t5
Fig. 9: Start-up scenario #3.
JUN 23, 2004 revised to NOV 20, 2006
Page 9 of 14
www.power-one.com
Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
10
9
8
7
6
5
4
3
2
1
0
10
9
8
7
6
5
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)
4
3
2
1
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 10: Available load current vs. ambient air temperature and
airflow rates for converter mounted vertically with Vin = 54 V,
air flowing from pin 3 to pin 1 and maximum FET temperature ≤
120°C.
Fig. 11: Available load current vs. ambient air temperature and
airflow rates for converter mounted vertically with Vin = 54 V,
air flowing from pin 3 to pin 1 and maximum FET temperature ≤
105°C.
10
9
10
9
8
8
7
7
6
6
5
5
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
500 LFM (2.5 m/s)
400 LFM (2.0 m/s)
4
4
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
3
3
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
2
2
1
0
1
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 12: Available load current vs. ambient temperature and
airflow rates for converter mounted horizontally with Vin = 54
V, air flowing from pin 3 to pin 4 and maximum FET tempera-
ture ≤ 120°C.
Fig. 13: Available load current vs. ambient temperature and
airflow rates for converter mounted horizontally with Vin = 54
V, air flowing from pin 3 to pin 4 and maximum FET tempera-
ture ≤ 105°C.
JUN 23, 2004 revised to NOV 20, 2006
Page 10 of 14
www.power-one.com
Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
0.90
0.85
0.80
72 V
54 V
36 V
70 C
55 C
40 C
0.75
0.70
0.65
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
Load Current [Adc]
Load Current [Adc]
Fig. 14: Efficiency vs. load current and input voltage for con-
verter 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. 15: Efficiency vs. load current and ambient temperature
for converter mounted vertically with Vin = 54 V and air flowing
from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
0.95
0.90
0.85
0.80
0.95
0.90
0.85
0.80
70 C
55 C
40 C
0.75
72 V
54 V
36 V
0.75
0.70
0.65
0.70
0.65
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
Load Current [Adc]
Load Current [Adc]
Fig. 17: Efficiency vs. load current and ambient temperature
for converter mounted horizontally with Vin = 54 V and air flow-
ing from pin 3 to pin 4 at a rate of 200 LFM (1.0 m/s).
Fig. 16: Efficiency vs. load current and input voltage for con-
verter mounted horizontally with air flowing from pin 3 to pin 4
at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.
JUN 23, 2004 revised to NOV 20, 2006
Page 11 of 14
www.power-one.com
Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
Fig. 18: Turn-on transient at full rated load current (resistive)
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 (5 V/div.) Time scale: 1 ms/div.
Fig. 19: Turn-on transient at full rated load current (resistive)
plus 2,200 µF at Vin = 48 V, triggered via ON/OFF pin. Top
trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage
(5 V/div.). Time scale: 2 ms/div.
Fig. 20: Output voltage response to load current step-change
(2 A – 4 A – 2 A) at Vin = 48 V. Top trace: output voltage (200
mV/div). Bottom trace: load current (2 A/div.). Current slew
rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale: 0.5 ms/div.
Fig. 21: Output voltage response to load current step-change
(2 A – 4 A – 2 A) at Vin = 48 V. Top trace: output voltage (200
mV/div.). Bottom trace: load current (2 A/div). Current slew
rate: 5 A/µs. Co = 450 µF tantalum + 1 µF ceramic. Time scale:
0.5 ms/div.
JUN 23, 2004 revised to NOV 20, 2006
Page 12 of 14
www.power-one.com
Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
iS
iC
10 µH
source
inductance
TM
33 µF
ESR <1
electrolytic
capacitor
1 µF
ceramic
capacitor
Family
Q
DC/DC
Converter
Ω
Vout
Vsource
Fig. 23: Test setup for measuring input reflected ripple cur-
rents, ic and is.
Fig. 22: Output voltage ripple (50 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.
Fig. 25: Input reflected ripple current, is (10 mA/div.), measured
through 10 µH at the source at full rated load current and Vin =
48 V. Refer to Fig. 23 for test setup. Time scale: 1µs/div.
Fig. 24: Input reflected ripple curent, ic (100 mA/div.), meas-
ured at input terminals at full rated load current and Vin = 48 V.
Refer to Fig. 23 for test setup. Time scale: 1µs/div.
JUN 23, 2004 revised to NOV 20, 2006
Page 13 of 14
www.power-one.com
Q48T08120 DC-DC Converter Data Sheet
36-75 VDC Input; 12VDC @ 8A Output
14
12
10
8
6
4
2
0
0
2
4
6
8
10
12
Iout [Adc]
Fig. 27: Load current (top trace, 10 A/div, 20 ms/div) into a 10
mΩ short circuit during restart, at Vin = 48 V. Bottom trace (10
A/div, 1 ms/div) is an expansion of the on-time portion of the
top trace.
Fig. 26: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost
no effect on current limit characteristic.
Fig. 28: 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.
JUN 23, 2004 revised to NOV 20, 2006
Page 14 of 14
www.power-one.com
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