Technical Specification
*
Quarter
Brick
48Vin 12Vout 25A
Narrow Input, Isolated DC/DC Bus Converter
The BusQor
™
BQ50120QTA25 bus converter is a
next-generation, board-mountable, isolated, fixed
switching frequency dc/dc converter that uses synchro-
nous rectification to achieve extremely high conversion
efficiency. The power dissipated by the converter is so
low that a heatsink is not required, which saves cost,
weight, height, and application effort. The BusQor
series provides an isolated step down voltage from 48V
to a 12V intermediate bus with no regulation in a stan-
dard “quarter-brick” module. BusQor converters are
ideal for customers who need multiple outputs and wish
to build or buy point of load converters to work with a
12V rail.
Bus
Conver ter
BQ50120QTA25 Module
Operational Features
• Ultra-high efficiency, >96% at full rated load current
• Delivers up to 25 amps (300 Watts) of output current
(power) with minimal derating - no heatsink required
• Input voltage range: 42V – 53V
• Fixed frequency switching provides predictable EMI
performance
Protection Features
• Input under-voltage lockout and over-voltage
shutdown protects against abnormal input voltages
• Output current limit and short circuit protection
• Output over-voltage protection
• Thermal shutdown
Mechanical Features
• Industry standard quarter-brick bus converter pin-out
• Industry standard size: 1.45” x 2.3”
(36.8x58.4mm)
• Total height only 0.43”
(10.9mm),
permits better air-
flow and smaller card pitch
• Total weight: 1.5 oz.
(42 grams)
• Flanged pins designed to permit surface mount sol-
dering (avoid wave solder) using FPiP technique
Safety Features
• 2000V, 30 MΩ input-to-output isolation
• UL/cUL 60950 recognized (US & Canada), basic
insulation rating
• TUV certified to EN60950
• Meets 72/23/EEC and 93/68/EEC directives
• Meets UL94V-0 flammability requirements
Control Features
• On/Off control referenced to input side
• Current sharing allowed without the use of any
external circuitry.
Product # BQ50120QTA25
Phone 1-888-567-9596
* Final datasheet pending ECO review and signature.
Doc.# 005-2BQ512M Rev. B
8/31/04
Page 1
Technical Specification
Quarter
Brick
MECHANICAL
DIAGRAM
2.30
(58.4)
48Vin 12Vout 25A
0.14
(3.6)
2.00
(50.8)
0.43
(10.8)
Top View
0.600
(15.24)
1.45
(36.8)
0.600
(15.24)
0.300
(7.62)
Side View
0.43
(10.9)
Bottom side
Clearance
See Note 9
0.060+/-0.030
(1.52+/-0.76)
Lowest
Component
Load Board
Flanged Pin
See Note 10
0.145
(3.68)
See Note 3
NOTES
1) Pins 1-3 are 0.040” (1.02mm) diameter with
0.080” (2.03 mm) diameter standoff shoulders.
2) Pins 4 and 5 are 0.062” (1.57 mm) diameter with
0.100” (2.54 mm) diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
4) All Pins: Material - Copper Alloy
Finish - Tin/Lead over Nickel plate
5) Undimensioned components are shown for visual
reference only.
6) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: 1.5 oz. (42 g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
9) UL/TUV standards require a clearance of 0.04”
(1.02mm) around primary areas of the module. Refer to
section on Keep Out Areas under Application
Considerations for details.
10) The flanged pins are designed to permit surface mount
soldeing (avoiding the wave soldering process) through
the use of the flanged pin-in-paste technique.
Product # BQ50120QTA25
Phone 1-888-567-9596
PIN DESIGNATIONS
Pin No.
1
2
3
4
5
Name
Vin(+)
ON/OFF
Vin(-)
Vout(-)
Vout(+)
Function
Input Positive (42V - 53V)
Logic control input to turn
converter on and off.
Input Negative
Output Negative
Output Positive
Doc.# 005-2BQ512M Rev. B
8/31/04
Page 2
Technical Specification
Quarter
Brick
BQ50120QTA25 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
48Vin 12Vout 25A
T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient
temperature with appropriate power derating. Specifications subject to change without notice.
Min.
Typ.
Max.
60
56
2000
100
125
12
48
39.5
38.0
1.5
55.0
54.0
0.07
7.5
5
75
1\1\4.4
47
12.00
+20 \ 2.4
+4.1 \ 500
+1.7 \ 200
100
25
34
8
+10
10
53
Units
V
V
V
°C
°C
V
V
V
V
V
V
V
A
A
mA
A
2
s
mA
mA
A
µF\µH\µF
µF
V
%\V
%\mV
%\mV
V
mV
mV
A
A
V
%
mA
µF
mV
µs
µs
ms
%
%
%
Notes & Conditions
continuous
continuous
Basic insulation, Pollution Degree 2
Input Voltage
Non-Operating
Operating
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
-40
-55
-2
42
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Maximum Input Current
No-Load Input Current
Disabled Input Current
Inrush Current Transient Rating
Input Reflected-Ripple Current
Input Terminal-Ripple Current
Recommended Input Fuse
1
Input Filter Component Values (C\L\C)
Recommended External Input Capacitance
6.8
0.11
15
0.01
100
12
Vin when unit will shut down
Vin when unit turns on after shutdown event
100% Load, 42 Vin
I
2
T rating of external fuse should be higher
RMS through 10µH inductor; Figs. 12 & 14
RMS, full load; Figs. 12 & 13
fast blow external fuse recommended
internal values
Typical ESR 0.1-0.2Ω, see Figure 12
48Vin, no load
Figure 4
Figure 4
Figure 4
over sample, line, load, temperature & life
20MHz bandwidth; Fig. 12 & 15
Full Load, see Figures 12 & 15
Full Load, see Figures 12 & 15
Subject to thermal derating; Figs 5-8
Output Voltage 10% Low; Fig. 16
% of rated output current
Negative current drawn from output
12Vout at 25A Resistive Load
50% to 75% to 50% Iout max; Figure 11
to within 1% Vout nom
Full load, Vout=90% nom.; Figs. 9 & 10
-40°C to +125°C; Figure E
5,000 µF load capacitance, Iout = 0A
Figure 1
Figure 1
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 5 - 8 for derating curves
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
2
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Current Share Accuracy (2 units paralleled)
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Start-Up Inhibit Time
Output Voltage Overshoot
100% Load
50% Load
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
9.7
13.3
150
40
25
0
3,000
DYNAMIC CHARACTERISTICS
200
100
500
63
5
96.1
96.4
125
125
125
2000
30
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
°C
°C
°C
V
M
Ω
pF
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
3
Isolation Resistance
Isolation Capacitance
4
470
Note 1: UL's product certification tests were carried out using 20A fast blow fuse. Fuse interruption characteristics have to be taken into account
while designing input traces. User should ensure that Input trace is capable of withstanding fault currents until fuse blows.
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com)
Note 3: For modules with isolation voltage rating of 2250V, order the Feature Set option C. See back page for ordering details.
Note 4: Higher values of isolation capacitance can be added external to the module.
Product # BQ50120QTA25
Phone 1-888-567-9596
Doc.# 005-2BQ512M Rev. B
8/31/04
Page 3
Technical Specification
Quarter
Brick
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
P
FEATURE CHARACTERISTICS
48Vin 12Vout 25A
Units
kHz
V
V
V
V
V
°C
°C
Min.
127.5
-1.0
2.4
2.4
-1.0
Typ.
150
Max.
172
0.8
18
18
0.8
Notes & Conditions
Figure B
Figure B
Over full temp range; no load
Average PCB Temperature
See App Note: Output Load Current Calc.
Switching Frequency
ON/OFF Control (Option P)
Off-State Voltage
On-State Voltage
ON/OFF Control (Option N)
Off-State Voltage
On-State Voltage
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
13.75
120
10
800
2.7
2.0
RELIABILITY CHARACTERISTICS
10
6
Hrs.
TR-NWT-000332; 100% load,300LFM, 40oC Ta
10
6
Hrs.
MIL-HDBK-217F; 100% load, 300LFM, 40oC Ta
10
6
Hrs. See website for latest values
STANDARDS COMPLIANCE
Parameter
P
STANDARDS COMPLIANCE
Notes
File # E194341, Basic insulation & pollution degree 2
Certified by TUV
test on entire assembly; board & plastic components UL94V-0 compliant
ESD test, 8kV - NP, 15kV air - NP
(Normal Performance)
Section 7 - electrical safety, Section 9 - bonding/grounding
UL/cUL 60950
EN60950
72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
GR-1089-CORE
• An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety
certificates on new releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter
P
QUALIFICATION TESTING
# Units
32
5
5
10
5
5
5
15 pins
Test Conditions
10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
95% rated V
in
and load, units at derating point, 1000 hours
100g minimum, 2 drops in x and y axis, 1 drop in z axis
-40°C to 100°C, unit temp. ramp 15°C/min., 500 cycles
T
operating
= min to max, V
in
= min to max, full load, 100 cycles
T
min
-10°C to T
max
+10°C, 5°C steps, V
in
= min to max, 0-105% load
85°C, 85% RH, 1000 hours, 2 minutes on and 6 hours off
MIL-STD-883, method 2003
• Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we
supply robust, reliable product. Contact factory for official product family qualification document.
OPTIONS
SynQor provides various options for Logic Sense, Pin Length and
Feature Set for this family of DC/DC converters. Please consult the
SynQor website (www.synqor.com) for information on available
options.
Product # BQ50120QTA25
Phone 1-888-567-9596
PATENTS
SynQor is protected under various patents, including but not lim-
ited to U.S. Patent numbers 5,999,417; 6,222,742 B1;
6,594,159 B2; 6,545,890 B2.
Doc.# 005-2BQ512M Rev. B
8/31/04
Page 4
Performance Curves
Quarter
Brick
12
10
100
98
96
48Vin 12Vout 25A
Power Dissipation (W)
Efficiency (%)
8
6
4
2
0
43 Vin
48 Vin
52 Vin
94
92
90
43 Vin
88
86
0
5
10
15
20
25
48 Vin
52 Vin
0
5
10
15
20
25
Load Current (A)
Load Current (A)
Figure 1:
Efficiency at nominal output voltage vs. load current for min-
imum, nominal, and maximum input voltage at 25
°
C.
Figure 2:
Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25
°
C.
98
97
Efficiency (%)
15
14
96
95
94
25 C
Output Voltage (V)
13
12
11
10
43Vin
9
8
48Vin
53Vin
0.0
2.5
5.0
7.5
10.0
12.5
15.0
17.5
20.0
22.5
25.0
93
92
0
100
200
300
400
40 C
55 C
500
Air Flow (LFM)
Load Current (A)
Figure 3:
Efficiency at nominal output voltage and 60% rated power vs.
airflow rate for ambient air temperatures of 25
°
C, 40
°
C, and 55
°
C
(nominal input voltage).
25
Figure 4:
Output voltage regulation vs. load current for minimum, nom-
inal, and maximum input voltage at 25
°
C.
20
I
out
(A)
15
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
50 LFM (0.25 m/s)
0
0
25
40
55
70
85
Semiconductor junction temperature is
within 1°C of surface temperature
Ambient Air Temperature (
o
C)
Figure 5:
Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 50 LFM through 400 LFM with air flowing
from pin 3 to pin 1 (nominal input voltage).
Product # BQ50120QTA25
Phone 1-888-567-9596
Figure 6:
Thermal plot of converter at 25 amp load current (300W)
with 55
°
C air flowing at the rate of 200 LFM. Air is flowing across the
converter from pin 3 to pin 1 (nominal input voltage).
Doc.# 005-2BQ512M Rev. B
8/31/04
Page 5
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