38A - SynQor

Technical
Specification
BQ55120EZB38
35-55V
12.0V
38A
2000V dc
Eighth-brick
Continuous Input
Output
Current
Isolation
DC-DC Converter
The BusQor BQ55120EZx38 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 BusQor series provides an isolated step
down voltage from 48V to 12 or 9.6V 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 (nonisolated) converters in intermediate bus architectures.
®
Operational Features
•
•
•
•
•
High efficiency, 97% at full rated load current
Delivers 38A full power with minimal derating - no heatsink required
Operating input voltage range: 35-55V
Fixed frequency switching provides predictable EMI
No minimum load requirement
BQ55120EZB38 Model
Mechanical Features
• Industry standard quarter-brick pin-out configuration
• Size: 0.96 x 2.3” (24.4x58.4mm), height: 0.539" (13.69mm)
• Total Baseplate weight: 1.69 oz (47.9 g)
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.
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
Contents
Page No.
Safety Features
• UL 60950-1/R2011-12
• EN60950-1/A2:2013
• CAN/CSA-C22.2 No. 60950-1/A1:2011
Product # BQ55120EZB38
Phone 1-888-567-9596
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standards Compliance & Qualification Testing . . . . . . . . . . . . . . . . . . . . 5
Technical Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Applications Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
www.synqor.com
Doc.# 005-0006259 Rev. B
04/13/15
Page 1
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-brick
Baseplated Mechanical Diagram
0.539 ± 0.030
[13.69 ± 0.75]
Overall Height
0.96 [24.4]
0.040 ± 0.010
[ 1.02 ± 0.25 ]
Bottomside
Clearance
4
0.600 [ 15.24]
5
0.004 [0.10]
2.30
[ 58.4]
2.000
[ 50.80]
2.000
[ 50.80]
0.15
[ 3.8]
0.15[3.8]
0.660 [16.76]
0.14
[ 3.6]
3
0.180[4.57]
2
1
0.18 [4.6]
SEE NOTE 1
0.300 [7.62]
0.600 [15.24]
NOTES
PIN DESIGNATIONS
1)APPLIED TORQUE PER M3 SCREW 5in-lb RECOMMENDED 6in-lb
LIMIT)
SCREW SHOULD NOT EXCEED 0.100" (2.54mm) DEPTH BELOW THE
SURFACE OF THE BASEPLATE.
2)BASEPLATE FLATNESS TOLERANCE IS 0.004" (.10mm) TIR FOR
SURFACE.
3)PINS 1-3 ARE 0.040" (1.02mm) DIA. WITH 0.080" (2.03mm)
DIA. STANDOFF SHOULDERS
4)PINS 4 & 5 ARE 0.062" (1.57mm) DIA. WITH 0.100" (2.54mm)
DIA. STANDOFF SHOULDERS
5)ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
6) WEIGHT: 1.69oz (47.9g)
7)ALL DIMENSIONS IN INCHES (mm)
TOLERANCES: X.XX IN +/-0.02 (X.X mm +/-0.5 mm)
X.XXX IN +/-0.010 (X.XX mm +/-0.25 mm)
Product # BQ55120EZB38
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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.# 005-0006259 Rev. B
04/13/15
Page 2
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-brick
Technical Specification
BQ55120EZB38 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C base plate 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 (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 # BQ55120EZB38
Typ.
Max.
Units Notes & Conditions
-1
35
60
55
V
V
-40
-45
-2
2000
100
125
18
V
°C
°C
V
55
V
35
48
33.4
31
2.4
56.9
59.2
8.5
10
375
10.8
115
12.0
20
20
47
9.4
µF
12
V
41.7\5.0
4.2\500
1.7\200
%\V
%\mV
%\mV
V
8.300
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V
V
V
V
V
V
A
mA
mA
mA
mA
A
µF
13.750
90
25
0
150
38
mV
mV
A
5,000
A
V
mA
µF
60
8
10
97
97
www.synqor.com
Continuous
Continuous
Vin = 35 V
RMS through 10µH inductor
RMS, full load
Fast blow external fuse recommended
Typical ESR 0.1-0.2 Ω
Internal value; see Note 4
Over sample, line, load, temperature & life
20 MHz bandwidth; see Note 2
Full load
Full load
Subject to thermal derating
Output Voltage 10% Low; see Note 4
Negative current drawn from output
12.0 Vout at 20 A Resistive Load
%
%
Doc.# 005-0006259 Rev. B
04/13/15
Page 3
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-brick
Technical Specification
BQ55120EZB38 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 base plate 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 5mF output capacitance)
Start-Up Inhibit Time
Output Voltage Overshoot
ISOLATION CHARACTERISTICS
Typ.
Max.
400
100
15
200
2
22
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 F
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
130
°C
Base Plate Temperature
100
°C
FEATURE CHARACTERISTICS
Switching Frequency
215
250
280
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
Open Voltage
4.4
V
Pull-Up Current
0.044
mA
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
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: Safety 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: [email protected])
Note 3: Isolation capacitance can be added external to the module.
Note 4: Recommend adding external filter inductor (0.47 µH) between external input capacitance (47 µF) and Bus Qor module.
Product # BQ55120EZB38
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www.synqor.com
Doc.# 005-0006259 Rev. B
04/13/15
Page 4
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-brick
Technical Specification
Standards Compliance & Qualification 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 # BQ55120EZB38
# 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
www.synqor.com
Doc.# 005-0006259 Rev. B
04/13/15
Page 5
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-brick
Technical Figures
100
98.0
95
97.5
90
97.0
Efficiency (%)
Efficiency (%)
85
80
75
70
96.0
35 Vin
25º C
48 Vin
65
95.5
55 Vin
0
10
20
30
Load Current (A)
95.0
40
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
15
10
Power Dissipation (W)
11
10
35 Vin
9
8
25º C
40º C
48 Vin
55º C
55 Vin
0
0
10
20
Load Current (A)
30
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).
20
5
40º C
55º C
60
Power Dissipation (W)
96.5
7
100
40
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).
500
40
35
400
30
Pout (W)
Iout (A)
25
20
15
200
400 LFM (2.0 m/s)
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
300 LFM (1.5 m/s)
100
200 LFM (1.0 m/s)
5
0
300
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
25
40
100 LFM (0.5 m/s)
50
60
70
0
85
Ambient Air Temperature (ºC)
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40
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 baseplate only) at different airflow rates with air flowing from output to
input (nominal input voltage).
Product # BQ55120EZB38
25
Figure 6: 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).
www.synqor.com
Doc.# 005-0006259 Rev. B
04/13/15
Page 6
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-brick
Technical Figures
500
40
35
400
30
Pout (W)
Iout (A)
25
20
15
200
400 LFM (2.0 m/s)
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
300 LFM (1.5 m/s)
100
200 LFM (1.0 m/s)
5
0
300
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
25
40
100 LFM (0.5 m/s)
50
60
70
0
85
Ambient Air Temperature (ºC)
25
40
50
60
70
85
Ambient Air Temperature (ºC)
Figure 7: Maximum output current derating curve vs. ambient air temperature
(with both baseplate and ¼” heat sink) 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 both baseplate and ¼” heat sink) at different airflow rates with air flowing
from output to input (nominal input voltage).
Figure 9: Turn-on transient at 100% load (resistive load) (5ms/div). Load cap:
5mF output capacitance. Input voltage pre-applied. Ch 1: ON/OFF input (2 V/
div). Ch 2: Vout (2V/div).
Figure 10: Turn-on transient at zero load (5ms/div). Load cap: 5mF output
capacitance. Ch 1: ON/OFF input (2 V/div). Ch 2: Vout (2V/div).
Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 15µF tantalum cap and 1µF
ceramic cap. Ch 1: Vout (500mV/div), Ch 2: Iout (20A/div).
Figure 12: Output voltage response to step-change in load current (50%-75%50% of Iout(max): dI/dt = 1A/µs). Load cap: 15µF, 30 mΩ ESR tantalum cap
and 1µF ceramic cap. Ch 1: Vout (500 mV/div), Ch 2: Iout (20A/div).
Product # BQ55120EZB38
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Doc.# 005-0006259 Rev. B
04/13/15
Page 7
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-brick
Technical Figures
Input
Reflected
Ripple
Current
source
impedance
iS
Input
Terminal
Ripple
Current
iC
VSOURCE
Output
Voltage
Ripple
DC-DC
Converter
VOUT
electrolytic
capacitor
ceramic
capacitor
tantalum
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 10µH source impedance and 47µF electrolytic
capacitor (1 A/div). See Figure 13.
Figure 15: Input reflected ripple current, is, through a 10µH source inductor,
using a 47µF electrolytic input capacitor (20mA/div). See Figure 13.
Figure 16: Output voltage ripple at nominal input voltage and rated load current
(50mV/div). Load capacitance: 1µF ceramic capacitor and 15µF tantalum
capacitor. Bandwidth: 20MHz. See Figure 13.
15
Output Voltage (V)
12
9
6
35 Vin
3
48 Vin
55 Vin
0
0
10
20
30
Load Current (A)
40
50
Figure 17: Output voltage vs. load current for different input voltages showing
typical current limit curves.
Product # BQ55120EZB38
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Figure 18: Load current (50A/div) as a function of time when the converter
attempts to turn on into a 1mΩ short circuit. Top trace (500µs/div) is an
expansion of the on-time portion of the bottom trace.
www.synqor.com
Doc.# 005-0006259 Rev. B
04/13/15
Page 8
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-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 an unregulated
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(-).
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.
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 points of load. In this case, the
bucks are represented with SynQor’s NiQor series of nonisolated DC/DC converters. In many applications requiring
multiple low voltage outputs, significant savings can be
achieved in board space and overall system costs
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: 12V, 9.6V, 7.5V, 5V, or 3.3V.
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.
Vin(+)
On/Off
10V
124K
49.9K
TTL
100K
Vin(-)
Figure B: Internal ON/OFF pin circuitry
SynQor’s BusQor modules act 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.
The BusQor architecture is very scalable, meaning multiple
bus converters can be connected directly in parallel to allow
current sharing for higher power applications.
3.3V
48Vdc
Front End
48Vdc
35-55V
2.5V
BusQor
Converter
12Vdc
1.8V
1.5V
0.9V
Typical User Board
NiQor
Converters
Loads
Figure A: Example of Intermediate Bus Architecture using BusQor bus converter
and NiQor non-isolated converters
Product # BQ55120EZB38
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Doc.# 005-0006259 Rev. B
04/13/15
Page 9
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-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
85 A
peak
Output
Voltage
<12V
0V
Time
220ms
20ms
Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to
scale)
Output
Current
60A
38A
Output
Voltage
12V
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 1ms typical (see Figure
C). The shutdown period lasts for a typical period of 200ms
(Figure D) after which the BusQor tries to power up again
(20ms). 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. To insure the current limit set point is within the
range specified in the electrical characteristics table, adding
an input inductor is recommended. This design does not
have an "on-board" input inductor like most other SynQor
products. the value of the inductor should be selected so
that the resonant frequency of this inductor and the "on
board" input capacitance is below (with margin) the input
ripple frequency (2*fs).
0V
1ms
Time
Figure C: Output Overload protection diagram (not to scale)
Product # BQ55120EZB38
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Doc.# 005-0006259 Rev. B
04/13/15
Page 10
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-brick
Applications Section
APPLICATION CONSIDERATIONS
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 12ms is initiated. The output builds up to
90% of the nominal value of 12V in a period of 15ms typical (50 % load).
Secondary
Primary
Bridging Capacitor
0.01”
1.50”
0.023”
At time t2, when the On/Off pin is de-asserted (disabled), the BusQor
output instantly drops to 0V. Fall time from 12V to 0V 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 Bus Qor modules.
Vin
0.01”
Figure F: Keep Out Areas for BusQor module (bottom view)
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.
UVLO
On/Off
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.
(N logic)
OFF
ON
t0
t1
t2
t
t3
Vout
Initial
Start-up
Inhibit
Start-up
Inhibit
Time
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.
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.
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
Figure E: Power Up/Down Diagram (not to scale) showing Start-Up Inhibit Period of 0.04”(40 mils) between pads to maintain compliance to UL standards for
the overall power system.
Start-Up
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.
Product # BQ55120EZB38
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006259 Rev. B
04/13/15
Page 11
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-brick
Applications Section
5.0%
Deviation from 50/50 Sharing (%)
4.0%
L1
3.0%
C1
2.0%
BusQor 1
1.0%
Common
Mode
0.0%
-1.0%
C3
-2.0%
L2
-3.0%
C2
Module 1
Module 2
-4.0%
BusQor 2
-5.0%
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
C4
Total Load Current (A)
Figure G: Current share performance of 2 paralleled modules
Figure H: Recommended PCB layout for input circuit
48Vin
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 G. An output capacitor
is recommended across each module and located close to the converter
for optimum filtering and noise control performance. Dedicated input
capacitors / inductors are recommended. The input inductor should be
placed between the external input capacitor and the input pins of the
Bus Qor module. The external input inductor will limit the ripple current
into the external input capacitor (this Bus Qor product does not have an
"on board" input inductor). 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 / inductor and the input terminals of the
BusQor module. See Figure H for details on PCB layout. Contact SynQor
application engineering for further assistance on PCB trace design.
The current share performance of two paralleled modules is illustrated
in the graph in Figure H. In this graph the typical percent deviation from
ideal sharing (50%) is plotted for each module versus the total output load
current at 48Vin.
Product # BQ55120EZB38
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006259 Rev. B
04/13/15
Page 12
Input: 35-55V
Output: 12.0V
Current: 38A
Package: Eighth-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 5 1 2 0 E Z B 3 8 N R S - G
6/6 RoHS
Options
(see
Ordering Information)
Model Number
Input Voltage
BQ55120EZB38xyz-G
35-55V
Output
Voltage
12.0V
Max Output
Current
38A
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
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
N - 0.145"
R - 0.180"
Feature Set
S - Standard
Not all combinations make valid part numbers, please contact SynQor for
availability. See the Product Summary web page for more options.
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].
Contact SynQor for further information and to order:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # BQ55120EZB38
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
PATENTS
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.# 005-0006259 Rev. B
04/13/15
Page 13