Technical
S pecification
BQ55120ETx20
35-55V
Input
12V
Output
240Watt
Power
2250Vdc
Isolation
Eighth-brick
DC Bus Conver ter
The BusQor
®
BQ55120ETx20 bus converter is a next-gener-
ation, board-mountable, isolated, fixed switching frequency
dc/dc converter that uses synchronous 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 35-55V to
a 12V intermediate bus with no regulation in a standard
“eighth-brick” module. BusQor converters are ideal for creat-
ing the mid-bus voltage required to drive point-of-load (non-iso-
lated) converters in intermediate bus architectures. RoHS
Compliant (see page 13 ).
Operational Features
• Ultra-high efficiency, >95.5% at full rated load current
• Delivers up to 20 amps of output current (240W) with
minimal derating - no heatsink required
• Input voltage range: 35V – 55V provides 12V bus for
distributed power architectures
• Fixed frequency switching provides predictable EMI per-
formance
Bus
Conver ter
BQ55120ETA20 Module
Pr otection Features
• Input under-voltage lockout and over-voltage shutdown
protects against abnormal input voltages
• Output current limit and short circuit protection
• Thermal shutdown
Mechanical Features
• Industry standard eighth-brick bus converter pin-out
• Industry standard size: 0.90” x 2.3” (22.9x58.4mm)
• Total height only 0.484” (12.29mm), permits better air-
flow and smaller card pitch
• Total weight: 0.7 oz. (20 grams)
• Flanged pins designed to permit surface mount solder-
ing (avoid wave solder) using FPiP technique
Safety Features
• 2250V, 30 MW input-to-output isolation
• UL/cUL 60950-1 recognized (US & Canada), basic
insulation rating
• TUV certified to EN60950-1
• Meets 72/23/EEC and 93/68/EEC directives
• Meets UL94V-0 flammability requirements
Contr ol Features
• On/Off control referenced to input side (positive and
negative logic options available)
Product # BQ55120ETx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE553C Rev. D
09/26/11
Page 1
Technical Specification
MECHANICAL
DIAGRAM
(open frame)
0.14
(3.6)
Input:
Output:
Current:
Package:
35-55 V
12 V
20 A
(240W)
Eighth-brick
2.30
(58.4)
2.00
(50.8)
5
Top View
0.15
(3.8)
1
0.90
2
3
0.300
(7.62)
(22.9)
0.600
(15.24)
4
0.082 +0.017
(2.08 +0.43)
Side View
Bottom side
Clearance
See Note 9
0.145
(3.68)
See Note 3
Lowest
Component
Load Board
Flanged Pin
See Note 10
0.463 +0.018
(11.76 +0.46)
Overall height
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 - Matte Tin 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: 0.7 oz. (20 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
soldering (avoiding the wave soldering process) through
the use of the flanged pin-in-paste technique.
PIN DESIGNATIONS
Pin No.
1
2
3
4
5
Name
Vin(+)
ON/OFF
Vin(-)
Vout(-)
Vout(+)
Function
Input Positive (35V - 55V)
Logic control input to turn
converter on and off.
Input Negative
Output Negative
Output Positive
Product # BQ55120ETx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE553C Rev. D
09/26/11
Page 2
Technical Specification
MECHANICAL
DIAGRAM
(encased)
0.99
(25)
0.600
(15.24)
0.496 ±0.025
Input:
Output:
Current:
Package:
35-55 V
12 V
20 A
(240W)
Eighth-brick
(12.6 ±0.63)
Overall height
5
4
Flanged Pin
See Note 10
(60.6)
2.39
(50.8)
2.00
Top View
Side View
0.18
(4.6)
0.145
1
2
3
0.19
(4.9)
0.300
(7.62)
0.600
(15.24)
0.010 ±0.010
(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 - Matte Tin 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: TBD oz. (TBD g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
9) The flanged pins are designed to permit surface mount
soldering (allowing to avoid the wave soldering process)
through the use of the flanged pin-in-paste technique.
10) Baseplate tolerance is 0.004” (0.10mm) TIR for surface.
(0.25 ±0.25)
Botom side clearance
See Note 9
PIN DESIGNATIONS
See previous page
Product # BQ55120ETx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE553C Rev. D
09/26/11
Page 3
Technical Specification
BQ55120ETx20 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input:
Output:
Current:
Package:
35-55 V
12 V
20 A
(240W)
Eighth-brick
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 tem-
perature with appropriate power derating. Specifications subject to change without notice.
Min.
Typ.
Max.
60
56
2250
100
125
18
48
32.0
30.5
1.5
59.0
58.0
7
10
50
1.5\2.0
47
12.00
+20 \ 2.4
+4.1 \ 500
+1.7 \ 200
8.0
100
20
0
27
Vin / 8
+10
10
3,000
200
200
9
3
0
95.5
96.0
125
125
125
2250
30
13.8
150
40
20
5.5
0.1
15
0.1
100
12
55
Units
V
V
V
°C
°C
V
V
V
V
V
V
V
A
A
mA
A
2
s
mA
mA
A
µH\µF
µF
V
%\V
%\mV
%\mV
V
mV
mV
A
A
V
%
mA
µF
mV
µs
ms
ms
%
%
%
°C
°C
°C
V
M
W
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
INPUT CHARACTERISTICS
-40
-55
-2
35
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
Input Filter Component Values (L\C)
Recommended External Input Capacitance
OUTPUT CHARACTERISTICS
100% Load, 35Vin
RMS through 10µH inductor; Figures 12 & 14
RMS, full load; Figures 12 & 13
Fast blow external fuse recommended
Internal values
Typical ESR 0.1-0.2W, see Figure 12
48Vin, no load
Figure 4
Figure 4
Figure 4
Over sample, line, load, temperature & life
20MHz bandwidth; Figures 12 & 15
Full Load, see Figures 12 & 15
Full Load, see Figures 12 & 15
Subject to thermal derating; Figures 5 - 8
Output Voltage 10% Low; Figure 16
% of rated output current
Negative current drawn from output
12Vout at 20A Resistive Load
50% to 75% to 50% Iout max; Figure 11
To within 1% Vout nom
Full load, Vout=90% nom.; Figures 9 & 10
-40°C to +125°C
2,500 µF load capacitance, Iout = 0A
Figures 1 - 3
Figures 1 - 3
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 5 - 8 for derating curves
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
1
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
DYNAMIC CHARACTERISTICS
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
EFFICIENCY
100% Load
50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com).
Product # BQ55120ETx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE553C Rev. D
09/26/11
Page 4
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
FEATURE CHARACTERISTICS
Input:
Output:
Current:
Package:
35-55 V
12 V
20 A
(240W)
Eighth-brick
Min.
165
-1.0
2.4
2.4
-1.0
Typ.
190
Max.
215
0.8
18
18
0.8
Units
kHz
V
V
V
V
Notes & Conditions
Switching Frequency
ON/OFF Control (Option P)
Off-State Voltage
On-State Voltage
ON/OFF Control (Option N)
Off-State Voltage
On-State Voltage
ON/OFF Control (Either Option)
Pull-Up Voltage
Pull-Up Resistance
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
RELIABILITY CHARACTERISTICS
Figures A & B
10
30
140
10
667
2.36
1.79
150
V
kW
°C
°C
Average PCB Temperature
See App Note: Output Load Current Calc.
10
6
Hrs.
TR-NWT-000332; 80% load,300LFM, 40oC Ta
10
6
Hrs.
MIL-HDBK-217F; 80% load, 300LFM, 40oC Ta
10
6
Hrs. See our website for details
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
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 60950-1
EN60950-1
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
3
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 Pin Length and Feature Set
for this family of Power Interface Modules. Please consult the last
page for information on available options.
PATENTS
SynQor is protected under various patents. Please consult the
last page for further information.
Product # BQ55120ETx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE553C Rev. D
09/26/11
Page 5
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