Technical
Specification
BQ55120ETL16
35-55V
Input
12V
Output
192Watt
Power
2000Vdc
Isolation
Eighth-brick
DC Bus Converter
The BusQor BQ55120ETL16 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 35-55V to a 12V intermediate
bus with no regulation in a standard “eighth-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.
RoHS compliant (see page 12).
Bus
Converter
Operational Features
• Ultra-high efficiency, >95% at full rated load current
• Delivers up to 16 amps of output current (192W) with
minimal derating - no heatsink required
• Input voltage range: 35V – 55V provides 12V bus for
distributed power architectures
• Fixed frequency switching provides predictable
EMI performance
BQ55120ETL16 Module
Protection 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 0.320” (8.13mm), permits better airflow
and smaller card pitch
• Total weight: 0.7 oz. (20 grams)
• Flanged pins designed to permit surface mount soldering
(avoid wave solder) using FPiP technique
Safety Features
• 2000V, 30 MW
input-to-output isolation
• UL 60950-1:R2011-12
• EN60950-1/A12:2011
• CAN/CSA-C22.2 No. 60950-1/A1:2011
Control Features
• On/Off control referenced to input side (positive and
negative logic options available)
Product # BQ55120ETL16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE552B Rev. D
10/10/2013
Page 1
Technical Specification
MECHANICAL
DIAGRAM
(50.8)
Input:
Output:
Current:
Package:
35-55 V
12 V
16 A
(192W)
Eighth-brick
(58.4)
2.30
2.00
0.14
(3.6)
Top View
0.15
(3.8)
1
2
3
(15.24)
5
(22.9)
0.90
4
0.600
0.300
(7.62)
0.025 +0.013
(0.64 +0.33)
Side View
Bottom side
Clearance
See Note 9
(3.68)
See Note 3
0.145
Lowest
Component
Load Board
Flanged Pin
See Note 10
0.320 +0.015
Overall height
(8.13 +0.38)
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: 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. Name
1
2
3
4
5
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 # BQ55120ETL16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE552B Rev. D
10/10/2013
Page 2
Technical Specification
BQ55120ETL16 ELECTRICAL CHARACTERISTICS
Parameter
ABSOLUTE MAXIMUM RATINGS
Input:
Output:
Current:
Package:
35-55 V
12 V
16 A
(192W)
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
temperature with appropriate power derating.
Specifications subject to change without notice.
Min.
-40
-55
-2
35
8.0
0
Typ.
48
32.0
30.5
1.5
59.0
58.0
7
5
50
1.5\2.0
47
12.00
+
20 \ 2.4
+
4.1 \ 500
+
1.7 \ 200
100
20
25
Vin / 8
+
10
10
200
200
9
3
0
95.3
95.5
2000
30
Max.
60
56
2000
100
125
18
55
4.7
0.1
15
0.1
100
12
13.8
150
40
16
3,000
125
125
125
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 CHARACTERISTICS
Input Voltage
Non-Operating
Operating
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
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
100% Load, 35Vin
OUTPUT CHARACTERISTICS
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 16A 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
DYNAMIC CHARACTERISTICS
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
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
EFFICIENCY
TEMPERATURE LIMITS FOR POWER DERATING CURVES
ISOLATION CHARACTERISTICS
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
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 # BQ55120ETL16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE552B Rev. D
10/10/2013
Page 3
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
FEATURE CHARACTERISTICS
Input:
Output:
Current:
Package:
35-55 V
12 V
16 A
(192W)
Eighth-brick
Min.
165
-1.0
2.4
2.4
-1.0
140
Typ.
190
10
30
10
1333
2.81
0.91
Max.
215
0.8
18
18
0.8
150
Units
kHz
V
V
V
V
V
kW
°C
°C
Notes & Conditions
RELIABILITY CHARACTERISTICS
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
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
Figures A & B
Average PCB Temperature
See App Note: Output Load Current Calc.
10
6
Hrs.
TR-NWT-000332; 100% load,300LFM, 40
oC Ta
10
6
Hrs.
MIL-HDBK-217F; 100% load, 300LFM, 40
oC Ta
10
6
Hrs. See our website for details
STANDARDS COMPLIANCE
STANDARDS COMPLIANCE
UL 60950-1:R2011-12
Basic insulation
EN60950-1/A12:2011
CAN/CSA-C22.2 No. 60950-1/A1:2011
Note: 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.
Parameter
Notes & Conditions
QUALIFICATION TESTING
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
Parameter
# Units
32
5
5
10
5
5
5
15 pins
Test Conditions
95% rated Vin and load, units at derating point, 1000 hours
10-55 Hz sweep, 0.060” total excursion, 1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x, y and z axis
-40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
85 °C, 95% RH, 1000 hours, continuous Vin applied except 5 min/day
MIL-STD-883, method 2003
Product # BQ55120ETL16
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BE552B Rev. D
10/10/2013
Page 4
Technical Specification
Input:
Output:
Current:
Package:
35-55 V
12 V
16 A
(192W)
Eighth-brick
Figure 1:
Efficiency at nominal output voltage vs. load current for
minimum, 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.
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).
Figure 4:
Output voltage regulation vs. load current for minimum,
nominal, and maximum input voltage at 25
°
C.
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 5:
Maximum output power derating curves vs. ambient air
temperature for airflow rates of 100 LFM through 400 LFM with air
flowing from pin 3 to pin 1 (nominal input voltage).
Product # BQ55120ETL16
Phone 1-888-567-9596
Figure 6:
Thermal plot of converter at 16 amp load current (192W)
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.# 005-2BE552B Rev. D
10/10/2013
Page 5
www.synqor.com
