50A [465W-813W]

Technical
Specification
BQ57120QEx50
52.5 V
9.3-16.25 V
50 A
630 W
2000 V dc
Quarter-brick
Input
Output
Current
Power
Isolation
DC-DC Converter
®
The BusQor® BQ57120QEx50 bus converter is a nextgeneration, 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
52.5 V to 13.1 V 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.
BQ57120QEx50 Model
Operational Features
•
•
•
•
•
Mechanical Features
High efficiency, 96.25% at full rated load current
Delivers 50 A full power with minimal derating - no heatsink required
Operating input voltage range: 40-65 V
Fixed frequency switching provides predictable EMI
No minimum load requirement
• Industry standard quarter-brick pin-out configuration
• Size: 1.45” x 2.3” (36.8 x 58.4 mm), 0.467” (11.86 mm)
• Open frame weight: 1.5 oz (42 g)
Protection Features
Control Features
• On/Off control referenced to input side
(positive and negative logic options are available)
• Inherent current share (by droop method) for high current and
parallel applications.
• 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
Contents
Page No.
Safety Features
• UL 60950-1/R2011-12
• EN60950-1/A2:2013
• CAN/CSA-C22.2 No. 60950-1/A1:2011
Product # BQ57120QEx50
Phone 1-888-567-9596
Open Frame Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Baseplated Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Compliance & Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Technical Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Applications Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 1
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Open Frame Mechanical Diagram
1.450
[ 36.83]
.600
[15.24 ]
5
.467 ±.020
[ 11.86 ±0.5]
OVERALL HEIGHT
4
.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 ]
.110
[ 2.79 ]
SEE NOTE 3
.300
[ 7.62 ]
.600
[ 15.24 ]
NOTES
PIN DESIGNATIONS
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)
7) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
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.
Product # BQ57120QEx50
Phone 1-888-567-9596
Pin
Name
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
www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 2
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Baseplated Mechanical Diagram
1.510[38.35]
.517±.030
[ 13.13±0.76 ]
OVERALL HEIGHT
1.100[27.94]
.600
[15.24]
.053±.030
[ 1.35±0.76 ]
BOTTOMSIDE
CLEARANCE
4
5
2.340
[59.44]
1.900
[48.26]
2.000
[50.8]
.750
[19.05]
1
2
3
.060
[1.52]
.160±.015 [4.06±0.38]
.455±.0151 [1.56±0.38]
.110
[2.79]
SEE NOTE 4
M3 INSERTS
(3 PLACES)
(SEE NOTES 1&2
.300[7.62]
.600[15.24]
.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.
2) Applied torque per screw should not exceed 6in-lb (0.7Nm)
3) Baseplate flatness tolerance is 0.004" (.10mm) TIR for surface
4) Other pin extension lengths available
5) 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)
Product # BQ57120QEx50
Phone 1-888-567-9596
PIN DESIGNATIONS
Pin
Name
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
www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 3
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Technical Specification
BQ57120QEx50 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 52.5 V 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.
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 (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
EFFICIENCY
100% Load
50% Load
Product # BQ57120QEx50
Typ.
Max.
Units Notes & Conditions
-1
40
75
65
V
V
-40
-45
-2
2000
100
125
18
V
°C
°C
V
65
V
40
52.5
38.4
35.8
2.6
66.3
68.5
8.5
25
550
17
160
12.0
50
20
47
0.47\11
µH\µF
13.12
V
48\6.25
4.6\600
1.6\200
%\V
%\mV
%\mV
V
9.30
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V
V
V
V
V
V
A
mA
mA
mA
mA
A
µF
16.25
110
40
0
180
50
mV
mV
A
5,000
A
V
mA
µF
63
9
10
96.3
96.6
www.synqor.com
Continuous
Continuous
RMS through 10 µH inductor
RMS, full load
Fast blow external fuse recommended
Typical ESR 0.1-0.2 Ω
Internal values
Over sample, line, load, temperature & life
20 MHz bandwidth; see Note 2
Full load
Full load
Subject to thermal derating
Output Voltage 10% Low
Negative current drawn from output
10.5 Vout at 30 A Resistive Load
%
%
Doc.# 005-0006201 Rev. C
07/21/15
Page 4
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Technical Specification
BQ57120QEx50 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 52.5 V 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.
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 5 mF output capacitance)
Start-Up Inhibit Time
Output Voltage Overshoot
ISOLATION CHARACTERISTICS
Typ.
Max.
350
100
15
200
0
25
Units Notes & Conditions
mV
µs
50% to 75% to 50% Iout max
To within 1% Vout nom
ms
ms
%
Half load, Vout=90% nom.
-40 °C to +125 °C; Figure E
5 mF load capacitance
Isolation Voltage (dielectric strength)
2000
V
See Absolute Maximum Ratings
Isolation Resistance
30
MΩ
Isolation Capacitance (input to output)
470
pF
See Note 3
Semiconductor Junction Temperature
125
°C
Package rated to 150 °C
Board Temperature
125
°C
UL rated max operating temp 130 °C
Transformer Core Temperature
125
°C
Maximum Baseplate Temperature, Tb
100
°C
FEATURE CHARACTERISTICS
Switching Frequency
175
200
225
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)
On-State Voltage
-1
0.8
V
Off-State Voltage
2.4
18
V
ON/OFF Control (Either Option)
Application notes Figures A & B
Pull-Up Voltage
5
V
Pull-Up Resistance
124
kΩ
Over-Temperature Shutdown OTP Trip Point
135
°C
Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis
10
°C
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
4.8
106 Hrs. 80% load, 200LFM, 40 °C Ta
Calculated MTBF (MIL-217) MIL-HDBK-217F
3.3
106 Hrs. 80% load, 200LFM, 40 °C Ta
Field Demonstrated MTBF
106 Hrs. See our website for details
Note 1: UL’s product certification tests were carried out using 20 A fast blow fuse. Fuse interruption characteristics have to be taken into account while
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Note 3: Isolation capacitance can be added external to the module.
Product # BQ57120QEx50
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www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 5
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Technical Specification
Compliance & Testing
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1/R2011-12
Basic insulation
EN60950-1/A2:2013
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
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
Product # BQ57120QEx50
# Units
32
5
5
10
5
5
5
15 pins
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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
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Doc.# 005-0006201 Rev. C
07/21/15
Page 6
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Technical Figures
100
98.0
95
97.5
90
97.0
Efficiency (%)
Efficiency (%)
85
80
75
70
96.5
96.0
40 Vin
25º C
52.5 Vin
65
95.5
65 Vin
55º C
60
0
10
20
30
Load Current (A)
40
40º C
95.0
50
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25 °C.
100
200
Air Flow (LFM)
300
400
Figure 2: 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).
35
14
25
Power Dissipation (W)
Power Dissipation (W)
30
20
15
10
40 Vin
13
12
11
40º C
65 Vin
55º C
0
0
10
20
30
Load Current (A)
40
10
100
50
Figure 3: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25 °C.
200
Air Flow (LFM)
300
400
Figure 4: Power dissipation 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).
700
60
600
50
500
Pout (W)
40
Iout (A)
25º C
52.5 Vin
5
30
20
400
300
200
400 LFM (2.0 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
10
300 LFM (1.5 m/s)
100
200 LFM (1.0 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
100 LFM (0.5 m/s)
0
0
25
40
50
60
70
25
85
Ambient Air Temperature (ºC)
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Semiconductor
junction
is
50
60temperature 70
within 1°C of surface temperature
85
Ambient Air Temperature (ºC)
Figure 5: Maximum output current derating curve vs. ambient air temperature
(with both baseplate and heat sink) at different airflow rates with air flowing
from output to input (nominal input voltage).
Product # BQ57120QEx50
40
Figure 6: Maximum output power derating curve vs. ambient air temperature
(with both baseplate and heat sink) at different airflow rates with air flowing
from output to input (nominal input voltage).
www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 7
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Technical Figures
700
60
600
50
500
Pout (W)
Iout (A)
40
30
20
400
300
200
400 LFM (2.0 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
10
300 LFM (1.5 m/s)
100
200 LFM (1.0 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
100 LFM (0.5 m/s)
0
0
25
40
50
60
70
85
25
Ambient Air Temperature (ºC)
40
50
60
70
85
Ambient Air Temperature (ºC)
Figure 7: Maximum output current derating curve vs. ambient air temperature
(with baseplate only) at different airflow rates with air flowing from output to
input (nominal input voltage).
Figure 8: Maximum output power derating curve vs. ambient air temperature
(with baseplate only) at different airflow rates with air flowing from output to
input (nominal input voltage).
Figure 9: Turn-on transient at half load (resistive load) (5 ms/div). Load cap: 5
mF ceramic output capacitance. Input voltage pre-applied. Ch 1: Vout (5 V/div).
Ch 2: ON/OFF input (2 V/div).
Figure 10: Turn-on transient at zero load (5 ms/div). Load cap: 5 mF ceramic
output capacitance. Ch 1: Vout (5 V/div), Ch 2: ON/OFF input (2 V/div).
Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1 A/µs). Load cap: 15 µF, 30 mΩ ESR tantalum cap
and 1 µF ceramic cap. Ch 1: Vout (500 mV/div), Ch 2: Iout (20 A/div). tantalum
cap and 1 µF ceramic cap. Ch 1: Vout (500 mV/div), Ch 2: Iout (20 A/div).
Figure 12: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 1 A/µs). Load cap: 15 µF, 30 mΩ ESR tantalum cap
and 1 µF ceramic cap. Ch 1: Vout (500 mV/div), Ch 2: Iout (20 A/div).
Product # BQ57120QEx50
Phone 1-888-567-9596
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Doc.# 005-0006201 Rev. C
07/21/15
Page 8
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Technical Figures
Input
Reflected
Ripple
Current
source
impedance
iS
Input
Terminal
Ripple
Current
iC
Output
Voltage
Ripple
DC-DC
Converter
VOUT
VSOURCE
electrolytic
capacitor
ceramic electrolytic
capacitor capacitor
Figure 13: Test set-up diagram showing measurement points for Input Terminal
Ripple Current (Figure 14), Input Reflected Ripple Current (Figure 15) and
Output Voltage Ripple (Figure 16).
Figure 14: Input Terminal Ripple Current, ic, at full rated output current and
nominal input voltage with 10 µH source impedance and 47 µF electrolytic
capacitor (500 mA/div). See Figure 13.
Figure 15: Input reflected ripple current, is, through a 10 µH source inductor,
using a 47 µF electrolytic input capacitor (50 mA/div). See Figure 13.
Figure 16: Output voltage ripple at nominal input voltage and rated load current
(100 mV/div). Load capacitance: 1 µF ceramic capacitor and 15 µF tantalum
capacitor. Bandwidth: 20 MHz. See Figure 13.
18
Output Voltage (V)
15
12
9
6
40 Vin
3
52.5 Vin
65 Vin
0
0
10
20
30
40
50
Load Current (A)
60
70
80
90
Figure 17: Output voltage vs. load current for different input voltages showing
typcial current limit curves.
Product # BQ57120QEx50
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Figure 18: Load current (50 A/div) as a function of time when the converter
attempts to turn on into a 1 mΩ short circuit. Top trace (500 µs/div) is an
expansion of the on-time portion of the bottom trace.
www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 9
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Applications Section
BASIC OPERATION AND FEATURES
CONTROL FEATURES
With voltages dropping and currents rising, the economics of
an Intermediate Bus Architecture (IBA) are becoming more
attractive, especially in systems requiring multiple low voltages.
IBA systems separate the role of isolation and voltage scaling
from regulation and sensing. The BusQor series bus converter
provides isolation and a coarse voltage step down in one
compact module, leaving regulation to simpler, less expensive
non-isolated converters.
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2,
permits the user to control when the converter is on or off.
This input is referenced to the return terminal of the input
bus, Vin(-). There are two versions of the converter that
differ by the sense of the logic used for the ON/OFF input.
In Figure A below, the BusQor module provides the isolation
stage of the IBA system. The isolated bus then distributes power
to the non-isolated buck regulators to generate the required
voltage levels at the point of load. In this case, the bucks are
represented with SynQor’s NiQor series of non-isolated dc/dc
converters. In many applications requiring multiple low voltage
outputs, significant savings can be achieved in board space
and overall system costs.
In the positive logic version, the ON/OFF input is active
high (meaning that a high turns the converter on). In the
negative logic version, the ON/OFF signal is active low
(meaning that a low turns the converter on). Figure B is a
detailed look of the internal ON/OFF circuitry.
When designing an IBA system with bus converters, the
designer can select from a variety of bus voltages. While there
is no universally ideal bus voltage, most designs employ one of
the following: 12 V, 9 V, 7.5 V, 5 V, or 3.3 V. Higher bus voltages
can lead to lower efficiency for the buck regulators but are
more efficient for the bus converter and provide lower board
level distribution current. Lower bus voltages offer the opposite
trade offs.
SynQor’s 12 Vout BusQor module acts as a true dc transformer.
The output voltage is proportional to the input voltage, with a
specified “turns ratio” or voltage ratio, plus minor drop from
the internal resistive losses in the module. When used in
IBA systems, the output variation of the BusQor must be in
accordance with the input voltage range of the non-isolated
converters being employed.
Vin(+)
On/Off
5V
124K
5V
49.9K
TTL
100k
The BusQor architecture is very scalable, meaning multiple bus
converters can be connected directly in parallel to allow current
sharing for higher power applications.
Vin(-)
Figure B: Internal ON/OFF pin circuitry
3.3V
Front End
52.5Vdc
40-65V
BusQor
Converter
13.1Vdc
2.5V
1.8V
1.5V
0.9V
Typical User Board
Converters
Loads
Figure A: Example of Intermediate Bus Architecture using BusQor bus converter
and NiQor non-isolated converters
Product # BQ57120QEx50
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Doc.# 005-0006201 Rev. C
07/21/15
Page 10
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Applications Section
PROTECTION FEATURES
Input Under-Voltage Lockout:The converter is designed
to turn off when the input voltage is too low, helping avoid
an input system instability problem, described in more detail
in the application note titled “Input System Instability”. The
lockout circuitry is a comparator with DC hysteresis. When
the input voltage is rising, it must exceed the typical TurnOn Voltage Threshold value (listed on the specification
page) before the converter will turn on. Once the converter
is on, the input voltage must fall below the typical Turn-Off
Voltage Threshold value before the converter will turn off.
Also see Figure E.
Output Current Limit: The output of the BusQor module
is electronically protected against output overloads. When
an overload current greater than the “DC Current-Limit
Inception” specification is drawn from the output, the output
shuts down to zero volt in a period of 20 ms typical (see
Figure D). The shutdown period lasts for a typical period
of 200 ms (Figure D) after which the BusQor tries to power
up again. If the overload persists, the output voltage will
go through repeated cycles of shutdown and restart with
a duty cycle of 10% (On) and 90% (Off) respectively. The
BusQor module returns (auto resetting) to normal operation
once the overload is removed. The BusQor is designed
to survive in this mode indefinitely without damage and
without human intervention.
Output
Current
65A
50A
Output
Voltage
Output
Current
95A
peak
Output
Voltage
<13.1V
0V
Time
220ms
20ms
Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to
scale)
Output Short Circuit Protection: When the output of
the BusQor module is shorted, a peak current of typically
95 A will flow into the short circuit for a period of about
20 ms. The output of the BusQor will shutdown to zero for
~ 200 mS (Figure D). At the end of the shutdown period
the BusQor module tries to power up again. If the short
circuit persists, the output voltage will go through repeated
cycles of shutdown and restart with a duty cycle of 10%
(On) and 90% (Off) respectively. The BusQor module
returns (auto resetting) to normal operation once the short
circuit is removed. The BusQor is designed to survive in
this mode indefinitely without damage and without human
intervention.
In the Auto resetting mode, also referred to as “Hiccup”
mode, the power drawn from the 52.5 V input is about 5
Watts, most of which is dissipated into the external fault. It
is important that copper traces and pads from the output
circuit be designed to withstand the short term peaks,
although the average current into the fault may be as low
as 5 A typical. See Figure 18 for appropriate waveform.
13.1V
0V
1ms
Time
Figure C: Output Overload protection diagram (not to scale)
Product # BQ57120QEx50
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Over-Temperature Shutdown: A temperature sensor
on the converter senses the average temperature of the
module. The thermal shutdown circuit is designed to turn the
converter off when the temperature at the sensed location
reaches the Over-Temperature Shutdown value. It will allow
the converter to turn on again when the temperature of the
sensed location falls by the amount of the Over-Temperature
Shutdown Restart Hysteresis value.
www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 11
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Applications Section
APPLICATION CONSIDERATIONS
0.01”
Start-Up Inhibit Period: Figure E details the Start-Up Inhibit Period
for the BusQor module. At time t0, when Vin is applied with On/Off pin
asserted (enabled), the BusQor output begins to build up. Before time t1,
when the input voltage is below the UVL threshold, the unit is disabled
by the Input Under-Voltage Lockout feature. When the input voltage rises
above the UVL threshold, the Input Under-Voltage Lockout is released, and
a typical Startup Inhibit Period of 12 ms is initiated. The output builds up
to 90% of the nominal value of 13.1 V in a period of 15 ms typical (50 %
load).
0.023”
At time t2, when the On/Off pin is de-asserted (disabled), the BusQor
output instantly drops to 0V. Fall time from 13.1 V to 0 V is dependent on
output capacitance and any parasitic trace inductance in the output load
circuit.
At time t3, when the On/Off pin is re-asserted (enabled), the BusQor
module output begins to build up after the inhibit period of 200 ms typical
has elapsed.
Refer to the Control Features section of the data sheet for details on
enabling and disabling methods for N and P logic type modules.
Bridging
Capacitor
0.01”
1.50”
Primary
Secondary
Figure F: Keep Out Areas for BusQor module
All layers including top and bottom, are subject to the keep out areas
shown around Primary pins of BusQor module. Actual keep outs along the
surface (Creepage) may vary depending on the PCB material CTI. Users
are advised to consult UL standards for details.
Vin
UVLO
Bridging Components: Bridging components like EMI filter capacitors
required to be placed as close as possible to the BusQor module for
optimum performance must observe the clearance/creepage requirements
of 0.04”(40 mils) between pads to maintain compliance to UL standards for
the overall power system.
On/Off
(N logic)
OFF
ON
t0
t1
t2
t3
Vout
t
Vin
Start-up
Inhibit
Fault Inhibit
Time
Output Load Current Calculation: The BusQor series allows the
converter output load to be measured without adding a current loop or
external shunt resistor to the designer’s PCB board under test. On the top
side of the BusQor converter is a current sense resistor as shown in Figure
G. The output load current is proportional to the voltage drop across this
sense resistor. This calculation is detailed below. A current sense resistor
referenced to the primary input is used in the equation below to calculate
the output load current.
Start-Up
Iload = (VRsense(load) - VRsense(no load) ) x 2000
Figure E: Power Up/Down Diagram (not to scale) showing Start-Up Inhibit
Period
Component Keep Out Area: Keep out areas for components not
referenced to the Primary circuit are shown in shaded areas in Figure F.
The keep out areas shown are consistent with UL’s requirements for Basic
Insulation of 0.04” (40 mils) for Pollution degree 2. User should consult UL
standards for other insulation classes and operating environments.
For applications that require mounting parts BELOW the BusQor
module, one should be aware of potential high levels of electromagnetic
interference, in addition to safety keep out. Users are advised to consult
SynQor Applications engineering in such applications.
Copper Keep Out Area: Keep out areas shown in Figure F are to be
observed for Top layer copper traces and vias. Internal layers buried one
or more layers may be exempt, depending on the PCB material grade and
thickness. Users are advised to consult UL standards for details.
Product # BQ57120QEx50
Note: Referenced keep out widths are adequate to withstand UL’s Basic
Insulation Dielectric strength tests for approved PCB materials. Applications
requiring Double or Reinforced insulation must double the keep out widths
shown in Figure F. Keep out areas shown have standard margins above
UL’s minimum requirements.
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where:
Iload = output load current
VRsense(no load) = voltage across the sense resistor with converter at
zero load
The number 2000 is a “Load Current Scale Factor” for this product, valid
only for Vin = 52.5 V. Hence, measurement should be made at this input
voltage.
The voltage drop across the sense resistor is about 25 mV at full load of
50 A. Therefore, proper measuring techniques must be used to ensure
accuracy. A calibrated DMM set to 300 mV is acceptable. Since this
measurement is done on the Primary area of the converter, a slight nonlinearity may be observed over the load current range. Measurements
should be made at 52.5 V input voltage. Using the Scale Factor referenced
above, the error may be on the order of 4%. For more detailed information
consult the application note on SynQor’s website titled “Output Load
Current Calculations”.
www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 12
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Applications Section
20.0%
15.0%
Deviation from 50/50 Sharing (%)
Current Sharing: BusQor modules are designed to operate in parallel
without the use of any external current share circuitry. A typical circuit for
paralleling two BusQor modules is shown in Figure H. An output capacitor
is recommended across each module and located close to the converter
for optimum filtering and noise control performance. Dedicated input
inductors are recommended but are considered optional. Input capacitors
must be located close to the converter module. PCB layout in the input
circuit should be such that high frequency ripple currents of each module is
restricted to a loop formed by the input capacitors and the input terminals
of the BusQor module. See Figure J for details on PCB layout. Contact
SynQor application engineering for further assistance on PCB trace design.
10.0%
5.0%
0.0%
-5.0%
-10.0%
Module 1
-15.0%
Module 2
-20.0%
10
20
30
40
50
60
70
80
90
100
Total Load Current (A)
Figure I: Current share performance of 2 paralleled modules
The current share performance of two paralleled modules is illustrated in
the graph in Figure I. In this graph the percent deviation from ideal sharing
(50%) is plotted for each module versus the total output load current at
48 Vin.
Figure G: Location of Sense Resistor
+
1
Vin
2
3
+
BusQor
module
(N logic
option)
5
—
1
2
3
BusQor
module
(N logic
option)
BusQor module
CM EMI
filter
4
—
(Not shown
in Figure H)
5
Bulk
Cap
BusQor module
Input LC filters
4
Figure H: BusQor Output Paralleling for increased current output
Product # BQ57120QEx50
48 Vin
13.1 Vout
100 A
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Figure J: Recommended PCB layout for input circuit
www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 13
Input: 40-65 V
Output: 9.3-16.25 V
Current: 50A
Package: Quarter-brick
Ordering Information
Part Numbering System
Ordering Information
The part numbering system for SynQor’s dc-dc converters follows the format
shown in the example below.
The tables below show the valid model numbers and ordering options for
converters in this product family. When ordering SynQor converters, please
ensure that you use the complete 15 character part number consisting of
the 12 character base part number and the additional characters for options.
Add “-G” to the model number for 6/6 RoHS compliance.
BQ 5 7 1 2 0 Q E B 5 0 N R S - G
6/6 RoHS
Options
(see
Ordering Information)
Model Number
Input Voltage
BQ57120QEw50xyz-G
40-65 V
Output
Max Output
Voltage
Current
9.3-16.25 V
50 A
Output Current
Thermal Design
Performance Level
Package Size
The following options must be included in place of the w x y z spaces in the
model numbers listed above.
Output Voltage
Input Voltage
Product Family
Thermal Design
A - Open Frame
B - Baseplated
The first 12 characters comprise the base part number and the last 3
characters indicate available options. The “-G” suffix indicates 6/6 RoHS
compliance.
Options Description: w x y z
Enable Logic
Pin Style
N - Negative
P - Positive
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
Feature Set
S - Standard
Application Notes
A variety of application notes and technical white papers can be downloaded
in pdf format from our website.
RoHS Compliance: The EU led RoHS (Restriction of Hazardous
Substances) Directive bans the use of Lead, Cadmium, Hexavalent
Chromium, Mercury, Polybrominated Biphenyls (PBB), and Polybrominated
Diphenyl Ether (PBDE) in Electrical and Electronic Equipment. This SynQor
product is 6/6 RoHS compliant. For more information please refer to
SynQor’s RoHS addendum available at our RoHS Compliance / Lead Free
Initiative web page or e-mail us at [email protected]
Not all combinations make valid part numbers, please contact SynQor for
availability.
Contact SynQor for further information and to order:
PATENTS
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # BQ57120QEx50
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Phone 1-888-567-9596
SynQor holds numerous U.S. patents, one or more of which apply to most of its power converter
products. Any that apply to the product(s) listed in this document are identified by markings on
the product(s) or on internal components of the product(s) in accordance with U.S. patent laws.
SynQor’s patents include the following:
5,999,417
6,222,742
6,545,890
6,594,159
6,731,520
6,894,468
6,896,526
6,927,987
7,050,309
7,072,190
7,085,146
7,119,524
7,269,034
7,272,021
7,272,023
7,558,083
7,564,702
7,765,687
7,787,261
8,023,290
8,149,597
8,493,751
8,644,027
WARRANTY
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from SynQor.
www.synqor.com
Doc.# 005-0006201 Rev. C
07/21/15
Page 14
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