43A [300W - 473W]

Technical
Specification
BQ55090QPA40
35-55 V
9.6 V
43 A
2000 V dc
Quarter-brick
Continuous Input
Output
Current
Isolation
DC-DC Converter
The BusQor BQ55090QPA40 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 48
V to 12 or 9.6 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.
®
Bus
Converter
Operational Features
• High efficiency, 96.5% at full rated load current
• Delivers full power with minimal derating - no heatsink required
• Operating input voltage range: 35-55 V
• Fixed frequency switching provides predictable EMI
• No minimum load requirement
BQ55090QPA40 Module
Control Features
• On/Off control referenced to input side
• Inherent current share (by droop method) for high current and
parallel applications.
Mechanical Features
Protection Features
• Input under-voltage lockout and over-voltage shutdown protects
against abnormal input voltages
• Output current limit and short circuit protection (auto recovery)
• Thermal shutdown
• Industry standard quarter-brick pin-out configuration
• Size: 1.45” x 2.3” (36.8 x 58.4 mm)
• Total height: 0.467” (11.86 mm)
• Total weight: 1.5 oz (42 g)
Contents
Safety Features
• UL 60950-1/R2011-12
• EN60950-1/A2:2013
• CAN/CSA-C22.2 No. 60950-1/A1:2011
Product # BQ55090QPA40
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Page No.
Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
BQ55090QPA40 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . 3
Standards Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Technical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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Doc.# 005-2BQ559K Rev. F
05/07/15
Page 1
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
Mechanical Diagram
NOTES
1)
2)
3)
4)
5)
6)
PIN DESIGNATIONS
Pins 1-3 are 0.040” (1.02 mm) diameter with 0.080” (2.03 mm)
diameter standoff shoulders.
Pins 4-5 are 0.062” (1.57 mm) diameter with 0.100” (2.54 mm)
diameter standoff shoulders.
Other pin lengths available. Recommended pin length is 0.03” (0.76
mm) greater than the PCB thickness.
All Pins: Material - Copper Alloy
Finish: Tin over Nickel plate
Undimensioned components are shown for visual reference only.
All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5 mm)
x.xxx +/-0.010 in. (x.xx +/-0.25 mm)
Pin
Name
Function
1
2
3
4
5
Vin(+)
ON/OFF
Vin(–)
Vout(–)
Vout(+)
Positive input voltage
Logic control input to turn converter on and off.
Negative input
Negative output
Positive output
7)
8)
9)
Weight: 1.5 oz (42 g) typical
Workmanship: Meets or exceeds IPC-A-610C Class II
UL/TUV standards require a clearance of 0.04” (1.02 mm) 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 # BQ55090QPA40
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Doc.# 005-2BQ559K Rev. F
05/07/15
Page 2
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
BQ55090QPA40 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 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
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Transient Protection
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
Product # BQ55090QPA40
Min.
Typ.
Max.
-1
35
48
60
55
N/A
V
V
V
2000
100
125
18
V
°C
°C
V
55
V
-40
-45
-2
35
48
33.5
31.1
2.4
47
0.22\11
V
V
V
V
V
V
A
mA
mA
mA
mA
A
µF
µH\µF
9.6
V
42\4.0
5.2\500
2\200
%\V
%\mV
%\mV
V
56.2
59.2
15.0
10
140
9.5
130
30.0
20
20
6.500
11.000
50
20
0
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Units Notes & Conditions
90
43
50
5
10
3,000
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mV
mV
A
A
V
mA
µF
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
Negative current drawn from output
9.6 Vout at 20 A Resistive Load
Doc.# 005-2BQ559K Rev. F
05/07/15
Page 3
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
BQ55090QPA40 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 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.
Typ.
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 3mF output capacitance)
Start-Up Inhibit Time
Output Voltage Overshoot
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance (input to output)
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Maximum Baseplate Temperature, Tb
EFFICIENCY
100% Load
50% Load
FEATURE CHARACTERISTICS
Switching Frequency
170
ON/OFF Control (Option P)
Off-State Voltage
-1
On-State Voltage
2.4
ON/OFF Control (Option N)
Off-State Voltage
2.4
On-State Voltage
-1
ON/OFF Control (Either Option)
Pull-Up Voltage
Pull-Up Resistance
Output Over-Voltage Protection
Over-Temperature Shutdown OTP Trip Point
140
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
RELIABILITY CHARACTERISTICS
Max.
200
100
Units Notes & Conditions
mV
µs
50% to 75% to 50% Iout max
To within 1% Vout nom
ms
ms
%
Half load resistive, Vout=90% nom.
-40 °C to +125 °C; Figure E
3 mF load capacitance
V
MΩ
pF
See Absolute Maximum Ratings
Package rated to 150 °C
UL rated max operating temp 130 °C
N/A
°C
°C
°C
°C
96.5
97
%
%
8
200
0
12
2000
30
470
125
125
125
200
230
kHz
0.8
18
V
V
18
0.8
V
V
See Note 3
Application notes Figure B
5.0
100
N/A
150
10
3333
Calculated MTBF (Telcordia) TR-NWT-000332
4.8
Calculated MTBF (MIL-217) MIL-HDBK-217F
Field Demonstrated MTBF
3.3
V
kΩ
V
°C
°C
Average PCB Temperature
See Application Notes; Output Load Current Calc.
106 Hrs. 80% load, 200 LFM, 40 °C Ta
106 Hrs. 80% load, 200 LFM, 40 °C Ta
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 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.
Product # BQ55090QPA40
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Doc.# 005-2BQ559K Rev. F
05/07/15
Page 4
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
Standards Compliance
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.
Qualification Testing
Parameter
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
Product # BQ55090QPA40
# 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.# 005-2BQ559K Rev. F
05/07/15
Page 5
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
100
20
18
16
Power Dissipation (W)
Efficiency (%)
95
90
85
80
35 Vin
48 Vin
55 Vin
75
5
10
15
20
25
30
35
12
10
8
6
35 Vin
4
48 Vin
55 Vin
2
70
0
14
0
40
0
5
10
15
Load Current (A)
20
25
30
35
40
Load Current (A)
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.
12
98
10
Output Voltage (V)
Efficiency (%)
97
96
95
25 ºC
40 ºC
55 ºC
94
100
200
300
8
6
4
35V
2
48V
55V
0
400
0
Air Flow (LFM)
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).
5
10
15
20
25
Load Current (A)
30
35
40
Figure 4: Output voltage regulation vs. load current for minimum, nominal, and
maximum input voltage at 25 °C.
45
40
35
Iout (A)
30
25
20
15
400
300
200
100
10
5
LFM (2.0
LFM (1.5
LFM (1.0
LFM (0.5
m/s)
m/s)
m/s)
m/s)
0
25
40
55
70
85
Semiconductor junction temperature is
within 1°C of surface temperature
Ambient Air Temperature (ºC)
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 # BQ55090QPA40
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Figure 6: Thermal plot of converter at 43 amp load current (400 W) 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).
www.synqor.com
Doc.# 005-2BQ559K Rev. F
05/07/15
Page 6
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
45
40
Semiconductor junction temperature is
within 1°C of surface temperature
35
Iout (A)
30
25
20
15
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
10
5
0
25
40
55
70
85
Ambient Air Temperature (ºC)
Figure 7: Maximum output power derating curves vs. ambient air temperature
for airflow rates of 100 LFM through 400 LFM with air flowing from output to
input (nominal input voltage).
Figure 8: Thermal plot of converter at 43 amp load current (400 W) with 55
°C air flowing at the rate of 200 LFM. Air is flowing across the converter from
output to input (nominal input voltage).
Figure 9: Turn-on transient at half load (resistive load) and 3 mF output
capacitance (2.0 ms/div). Input voltage pre-applied. Channel 1: Vout (2 V/div).
Channel 2: ON/OFF input (2 V/div).
Figure 10: Turn-on transient at zero load and 3 mF output capacitance (2.0 ms/
div). Input voltage pre-applied. Channel 1: Vout (2 V/div). Channel 2: ON/OFF
input (2 V/div).
See Fig. 14
10 µH
source
impedance
See Fig. 13
See Fig. 15
iS
VSOURCE
iC
DC/DC
Converter
47 µF,
<1W ESR
electrolytic
capacitor
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, 100 mW ESR tantalum
cap and 1 µF ceramic cap. Top trace: Vout (200 mV/div), Bottom trace: Iout (10
A/div).
Product # BQ55090QPA40
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VOUT
1 µF
15 µF,
ceramic 450mW ESR
capacitor
tantalum
capacitor
Figure 12: Test set-up diagram showing measurement points for Input Terminal
Ripple Current (Figure 13), Input Reflected Ripple Current (Figure 14) and
Output Voltage Ripple (Figure 15).
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Doc.# 005-2BQ559K Rev. F
05/07/15
Page 7
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
Figure 13: Input Terminal Ripple Current, ic, at full rated output current and
nominal input voltage with 10 µH source impedance and 47 µF electrolytic
capacitor (50 mA/div). See Figure 12.
Figure 14: Input reflected ripple current, is, through a 10 µH source inductor at
nominal input voltage and rated load current (5 mA/div). See Figure 12.
12
Output Voltage (V)
10
8
6
4
35 Vin
48 Vin
2
55 Vin
0
0
Figure 15: Output voltage ripple at nominal input voltage and rated load current
(50 mV/div). Load capacitance: 1 µF ceramic capacitor and 15 µF tantalum
capacitor. Bandwidth: 20 MHz. See Figure 12.
10
20
30
Load Current (A)
40
50
60
Figure 16: Output voltage vs. load current showing typical current limit curves
and converter shutdown points.
Output Impedance (ohms)
1
0.1
0.01
35 Vin
48 Vin
55 Vin
0.001
10
Figure 17: Load current (10 A/div) as a function of time when the converter
attempts to turn on into a 1 mW short circuit. Top trace (5.0 ms/div) is an
expansion of the on-time portion of the bottom trace.
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100
1,000
Hz
10,000
100,000
Figure 18: Magnitude of incremental output impedance (Zout = vout/iout) for
minimum, nominal, and maximum input voltage at full rated power.
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Doc.# 005-2BQ559K Rev. F
05/07/15
Page 8
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
0
0
-5
-5
Reverse Transmission (dB)
Forward Transmission (dB)
Technical Specification
-10
-15
-20
35 Vin
48 Vin
55 Vin
-25
-10
-15
-20
35 Vin
48 Vin
55 Vin
-25
-30
-30
10
100
1,000
Hz
10,000
100,000
10
100
1,000
10,000
100,000
Hz
Figure 19: Magnitude of incremental forward transmission (FT = vout/vin) for
minimum, nominal, and maximum input voltage at full rated power.
Figure 20: Magnitude of incremental reverse transmission (RT = iin/iout) for
minimum, nominal, and maximum input voltage at full rated power.
Input Impedance (ohms)
1000
100
10
35 Vin
48 Vin
55 Vin
1
0.1
10
100
1,000
10,000
100,000
Hz
Figure 21: Magnitude of incremental reverse transmission (RT = Iin/Iout) for
minimum, nominal, and maximum input voltage at full rated power.
Product # BQ55090QPA40
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Doc.# 005-2BQ559K Rev. F
05/07/15
Page 9
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
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.
Vin+
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, 9V, 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.
SynQor’s 9.6 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.
5k
5V
100k
On/Off
49.9k
TTL
100k
Vin
Figure B: Internal ON/OFF pin circuitry
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
35-55V
BusQor
Converter
9.6Vdc
2.5V
1.8V
1.5V
48Vdc
Front End
0.9V
Typical User Board
NiQor
Converters
Loads
Figure A: Example of Intermediate Bus Architecture using BusQor bus converter
and NiQor non-isolated converters
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Doc.# 005-2BQ559K Rev. F
05/07/15
Page 10
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
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 Turn-On 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 Short Circuit Protection: When the output of the
BusQor module is shorted, a peak current of typically 72 A
will flow into the short circuit for a period of about 20ms. The
output of the BusQor will shutdown to zero volts for the same
period (Figure D). The shutdown period lasts for a period of
200ms, at the end of which the BusQor module tries to power
up again. If the short circuit persists, the output voltage will go
through repeat ed cycles of shutdown and restart with a duty
cycle of 20ms (On) and 200ms (Off) respectively. The BusQor
module returns (auto resetting) to normal operation once the
short circuit is removed.
Output
Current
Vin
53A
43A
UVLO
On/Off
(N logic)
Output
Voltage
9.6V
OFF
ON
0V
t0
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 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 20ms (On) and
200ms (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
Output
Current
Current
72A
peak
Output
Output
Voltage
Voltage
9.6V
0V
0V
220ms
Time
20ms
Figure D: Output Short Circuit and Auto-Resetting protection diagram
(not to scale)
Product # BQ55090QPA40
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t1
t2
t
t3
Vout
1ms
Time
Figure C: Output Overload protection diagram (not to scale)
12V
3ms
4ms
Time
6-12ms
Figure E: Power Up/Down Diagram (not to scale) showing Start-Up Inhibit Period
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 48V 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 100mA typical. See Figure 17
for appropriate waveform.
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.# 005-2BQ559K Rev. F
05/07/15
Page 11
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
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 3ms is initiated. The output
builds up to 90% or higher of the nominal voltage and stabilizes
at the nominal value of 9.6 V in a period of 2 to 8ms typical
(depending on loading). The rise time from 0V to 90% is 1.8ms
typical (with 3mF external output capacitance at no load).
At time t2, when the On/Off pin is de-asserted (disabled), the
BusQor output instantly drops to 0V. Fall time from 9.6V 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 4ms typical. Refer
to the Control Features section of the data sheet for details on
enabling and disabling methods for N and P logic type modules.
Keep Out Areas:
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 of 0.04”(40 mils) between
pads to maintain compliance to UL standards for the overall
power system.
Note: Referenced keep out widths are adequate to withstand
ULs 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 ULs
minimum requirements.
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.
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.
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.
A current sense resistor referenced to the primary input is used
in the equation below to calculate the output load current.
0.01”
Iload = (VRsense(load) - VRsense(no load) ) x 3333
where:
Iload = output load current
VRsense(load) = voltage across the sense resistor with
converter under load
VRsense(no load) = voltage across the sense resistor with
converter at zero load
0.023”
Bridging
Capacitor
0.01”
1.50”
Primary
Secondary
Figure F: Keep Out Areas for BusQor module
Product # BQ55090QPA40
Phone 1-888-567-9596
Figure G: Location of Sense Resistor
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Doc.# 005-2BQ559K Rev. F
05/07/15
Page 12
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
5.0%
4.0%
Deviation from 50/50 Sharing (%)
The number 3333 is a “Load Current Scale Factor” for this
product, valid only for Vin = 48V. Hence, measurement should
be made at this input voltage. The voltage drop across the
sense resistor is about 13mV at full load of 43A. Therefore,
proper measuring techniques must be used to ensure accuracy.
A calibrated DMM set to 300mV is acceptable. Since this
measurement is done on the Primary area of the converter,
a slight non-linearity may be observed over the load current
range. 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 web site titled “Output Load
Current Calculations”.
3.0%
2.0%
1.0%
0.0%
-1.0%
-2.0%
-3.0%
Module 1
-4.0%
-5.0%
Module 2
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
Total Load Current (A)
Figure I: Current share performance of 2 paralleled modules
5
BusQor module
(N logic
option)
2
4
3
1
Vin
1
9.6Vout
86A
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 48Vin.
5
BusQor module
(N logic
2
option)
4
3
48Vin
BusQor module
CM EMI filter
Figure H: BusQor Output Paralleling for increased current output.
Bulk
Cap
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.
Product # BQ55090QPA40
Phone 1-888-567-9596
BusQor module
(Not shown
in Figure H)
Input LC filters
Figure J: Recommended PCB layout for input circuit
www.synqor.com
Doc.# 005-2BQ559K Rev. F
05/07/15
Page 13
Input:35-55 V
Output:9.6 V
Current:43 A
Part No.:BQ55090QPA40
Technical Specification
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s BusQor DC bus 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 3 characters for options.
A “-G” suffix indicates the product is 6/6 RoHS compliant.
BQ 5 5 0 9 0 Q P A 4 0 N N S - G
6/6 RoHS
Options
(see
Ordering Information)
Output Current
Model Number
Input
Voltage
Output
Voltage
Max Output
Current
BQ55090QPA40xyz
35-55 V
9.6 V
43 A
Thermal Design
Performance Level
Package Size
Output Voltage
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Input Voltage
Product Family
Options Description: x y z
The first 12 characters comprise the base part number and the
last 3 characters indicate available options. Although there
are no default values for enable logic and pin length, the most
common options are negative logic and 0.145” pins. These
part numbers are more likely to be readily available in stock
for evaluation and prototype quantities. A “-G” suffix indicates
the product is 6/6 RoHS compliant.
Enable Logic
Pin Style
Feature Set
*P - Positive
N - Negative
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
S - Standard
* Consult the factory before ordering the P logic option.
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
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
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # BQ55090QPA40
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
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.# 005-2BQ559K Rev. F
05/07/15
Page 14
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