BQ55120QEx50
35-55V
Continuous Input
Technical
Specification
Quarter-brick
DC-DC Converter
®
12.0V
Output
50A
Max Current
2000V dc
The BusQor BQ55120QEx50 bus converter is a next-
generation, 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 48V to 12 or 9.6V intermediate bus with no
regulation in a standard “quarter-brick” module. BusQor
converters are ideal for creating the mid-bus voltage
required to drive point-of-load (non-isolated) converters in
intermediate bus architectures.
Bus
Isolation
Bus
Converter
Operational Features
•
•
•
•
•
High efficiency, 96.8 % at full rated load current at full load
Delivers full power with minimal derating - no heatsink required
Operating input voltage range: 35-55V dc
Fixed frequency switching provides predictable EMI
No minimum load requirement
BQ55120QEA50NRS-G
Control Features
• On/Off control referenced to input side
• Inherent current share (by droop method) for high current and
parallel applications.
Mechanical Features
•
•
•
•
•
Industry standard size: 1.45” x 2.3” (36.8x58.4mm)
Total OF height: 0.467” (11.86mm)
Total open frame weight: 1.5 oz (42 g)
Total Baseplate height: 0.517" (13.13mm)
Total Baseplate weight: 2.7 oz (78 g)
Safety Features
• UL 60950-1:2007
• EN60950-1/A11:2009/A1:2010
• CAN/CSA-C22.2 No. 60950-1:2007
• IEC 61000-4-2
Contents
Protection Features
• Input under-voltage lockout and over-voltage shutdown protects
against abnormal input voltages
• Output current limit and short circuit protection (auto recovery)
• Output over-voltage protection
• Thermal shutdown
Open Frame Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Baseplated Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Standards and Qualifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Technical Figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ordering Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Page No.
Product # BQ55120QEx50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005571 Rev. F
10/03/11
Page 1
Open Frame Mechanical
1.450
[ 36.83]
.600
[15.24 ]
5
4
.467 ±.020
[ 11.86 ±0.5]
OVERALL HEIGHT
Input:35-55V
Output:12.0V
Current:50A
Part No.:BQ55120QEx50
.056 ±.010
[ 1.42 ±0.25 ]
BOTTOMSIDE
CLEARANCE
2.300
[ 58.42 ]
2.000
[ 50.8 ]
.143
[ 3.63 ]
1
2
3
.425
[ 10.8 ]
.300
[ 7.62 ]
.600
[ 15.24 ]
.110
[ 2.79 ]
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 4-5 are 0.062” (1.57 mm) diameter with 0.100” (2.54 mm)
diameter standoff shoulders.
3) Other pin 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: 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.
10)
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.
Pin
Name
PIN DESIGNATIONS
Function
1 Vin(+) Positive input voltage
2 ON/OFF Logic control input to turn converter on/off.
3 Vin(–) Negative input
4 Vout(–) Negative output
5 Vout(+) Positive output
Product # BQ55120QEx50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005571 Rev. F
10/03/11
Page 2
Baseplated Mechanical Diagram
1.510[38,35]
1.100[27,94]
.600
[15,24]
.517±.030
[ 13,13±0,76 ]
OVERALL HEIGHT
Input:35-55V
Output:12.0V
Current:50A
Part No.:BQ55120QEx50
5
4
.053±.030
[ 1,35±0,76 ]
BOTTOMSIDE
CLEARANCE
2.340
[59,44]
2.000
[50,8]
1.900
[48,26]
.750
[19,05]
1
.160±.0154,06±0,38[]
.455±.01511,56±0,38[]
.300[7,62]
.600[15,24]
2
3
.060
[1,52]
M3 INSERTS
(3 PLACES)
(SEE NOTES 1&2
.110
[2,79]
SEE NOTE 4
.850[21,59]
NOTES
1) M3 screws used to bolt unit's baseplate to other surfaces such as
heatsinks must not exceed 0.10" (2.54mm) depth below the surface
of the baseplate.
Applied torque per screw should not exceed 6in-lb (0.7nm)
Baseplate flatness tolerance is 0.004" (.10mm) TIR for surface
Other pin extension lengths available
Pins 1-3 are 0.040" (1.02mm) dia. with 0.080" (2.03mm) dia.
standoff shoulders
6) Pins 4 and 5 are 0.062" (1.57mm) dia. with 0.100" (2.54mm) dia.
standoff shoulders
7) All pins: Material: Copper Alloy
Finish: Matte Tin over Nickel plate
8) Undimensioned components are shown for visual reference only
9) Weight: 2.7 oz (78 g) typical
10) All dimensions in inches(mm)
Tolerances: x.xxin +/-0.02 (x.xmm +/-0.5mm)
x.xxxin +/-0.010 (x.xxmm +/-0.25mm)
2)
3)
4)
5)
Pin
Name
PIN DESIGNATIONS
Function
1 Vin(+) Positive input voltage
2 ON/OFF Logic control input to turn converter on/off.
3 Vin(–) Negative input
4 Vout(–) Negative output
5 Vout(+) Positive output
Product # BQ55120QEx50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005571 Rev. F
10/03/11
Page 3
Technical Specification
BQ55120QEx50 Electrical Characteristics
Input:35-55V
Output:12.0V
Current:50A
Part No.:BQ55120QEx50
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc 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.
Parameter
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Isolation Voltage
Input to Output
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
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-On Voltage Threshold
Turn-Off Voltage Threshold
Maximum Input Current
No-Load Input Current
Disabled Input Current
Input Reflected-Ripple Current
Input Terminal-Ripple Current
Recommended Input Fuse (see Note 1)
Recommended External Input Capacitance
Input Filter Component Values (C\L\C)
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
Settling Time
Turn-On Transient
Turn-On Time (with 5mF output capacitance)
Start-Up Inhibit Time
Output Voltage Overshoot
Min.
0
35
Typ.
Max.
60
55
2000
100
125
18
Units Notes & Conditions
V
V
V
°C
°C
V
V
V
V
V
V
V
V
A
mA
mA
mA
mA
A
µF
µH\µF
V
%\V
%\mV
%\mV
V
mV
mV
A
A
V
mA
µF
Continuous
Continuous
48
-40
-55
-2
35
48
33.4
31
2.4
56.9
59.2
55
8.5
10
600
47
0.47\11
12.0
40\4.75
5.2\500
2\200
8.300
75
30
0
65
10.4
10
14.5
110
12.0
20
20
RMS through 10µH inductor
RMS, full load
Fast blow external fuse recommended
Typical ESR 0.1-0.2 Ω
Internal values
No load Vin = 48 V
13.750
125
50
5,000
Over sample, line, load, temperature & life
20 MHz bandwidth; see Note 2
Full load
Full load
Subject to thermal derating
Output Voltage 10% Low
Vin = 48 V
Negative current drawn from output
12.0 Vout at Half Load Resistive Load
450
100
10
200
0
15
mV
µs
ms
ms
%
50% to 75% to 50% Iout max
To within 1% Vout nom
Half load, Vout=90% nom.
-40 °C to +125 °C; Figure E
5 mF load capacitance
Product # BQ55120QEx50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005571 Rev. F
10/03/11
Page 4
Technical Specification
Input:35-55V
Output:12.0V
Current:50A
Part No.:BQ55120QEx50
BQ55120QEx50 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc 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.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
2000
V
See Absolute Maximum Ratings
Isolation Resistance
30
MΩ
Isolation Capacitance (input to output)
470
pF
See Note 3
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
125
°C
Package rated to 150 °C
Board Temperature
125
°C
UL rated max operating temp 130 °C
Transformer Core Temperature
140
°C
Maximum Baseplate Temperature, Tb
100
°C
EFFICIENCY
100% Load
96.8
%
50% Load
97
%
FEATURE CHARACTERISTICS
Switching Frequency
133
150
165
kHz
ON/OFF Control (Option P)
Off-State Voltage
-1
0.8
V
On-State Voltage
2.4
18
V
ON/OFF Control (Option N)
Off-State Voltage
2.4
18
V
On-State Voltage
-1
0.8
V
ON/OFF Controll (Either Option)
Application note Figure B
Pull-Up Voltage
5
V
Pull-Up Resistance
100
kΩ
Over-Temperature Shutdown OTP Trip Point
140
150
°C
Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis
10
°C
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
3.7
106
Hrs. 80% load, 300LFM, 40 °C Ta
Calculated MTBF (MIL-217) MIL-HDBK-217F
2.9
106
Hrs. 80% load, 300LFM, 40 °C Ta
Field Demonstrated MTBF
106
Hrs.
See our website for details
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
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com)
Note 3: Isolation capacitance can be added external to the module.
Product # BQ55120QEx50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005571 Rev. F
10/03/11
Page 5
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