BQ55090QPA40NYS-G [SYNQOR]
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Technical
Specification
BQ55090QPA40
35-55V
9.6V
Output
43A
Current
2000Vdc Quarter-brick
Input
Isolation
DC Bus Converter
®®
The BusQor BQ55090QPA40 bus converter is a next-gen-
eration, board-mountable, isolated, fixed switching frequen-
cy DDC/DC cconverter tthat uuses ssynchronous rrectification tto
achieve extremely high conversion efficiency. The power
dissipated by the converter is so low that a heatsink is not
required, wwhich ssaves ccost, wweight, hheight, aand aapplication
effort. TThe BBusQor sseries pprovides aan iisolated sstep ddown
voltage ffrom 448V tto a 99.6V iintermediate bbus wwith nno rregu-
lation in a standard “quarter-brick” module. BusQor con-
verters are ideal for creating the mid-bus voltage required to
drive point-of-load (non-isolated) converters in intermediate
bus aarchitectures. RRoHS ccompliant ((see ppage 112).
Bus
Converter
Operational Features
BQ55090QPA40 Module
• Ultra-high efficiency, 96.5% at 40A
• Delivers up to 43 amps of output current with minimal
derating - no heatsink required
• Input voltage range: 35V – 55V provides 6.5-11V bus
for distributed power architectures
Protection Features
• Fixed frequency switching provides predictable EMI per-
• Input under-voltage lockout and over-voltage shutdown
protects against abnormal input voltages
formance
• Output current limit and short circuit protection
• Thermal shutdown
Mechanical Features
• Industry standard quarter-brick bus converter pin-out
• Industry standard size: 1.45” x 2.3” (36.8x58.4mm)
• Total height only 0.467” (11.86mm), permits better air-
Safety Features
flow and smaller card pitch
• Total weight: 1.5 oz. (42 grams)
• 2000V, 30 MΩ input-to-output isolation
• Flanged pins designed to permit surface mount solder-
• UL/cUL 60950-1 recognized (US & Canada), basic
ing (avoid wave solder) using FPiP technique
insulation rating
• TUV certified to EN60950-1
• Meets 72/23/EEC and 93/68/EEC directives
• Meets UL94V-0 flammability requirements
Control Features
• On/Off control referenced to input side (positive and
negative logic options available)
• Inherent current share (by droop method) for high cur-
rent and parallel applications.
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 1
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
MECHANICAL
DIAGRAM
2.30
(58.4)
2.00
(50.8)
0.14
(3.6)
1
5
4
Top View
1.45
(36.8)
2
3
0.600
(15.24)
0.300
(7.62)
0.600
(15.24)
0.43
(10.9)
0.467 +0.020
(11.86 +0.5)
0.145
(3.68)
See Note 3
Side View
0.063 +0.020
Lowest
Component
(1.6 +0.5)
Flanged Pin
See Note 10
Bottom side
Clearance
See Note 9
Load Board
NOTES
PIN DESIGNATIONS
1) Pins 1-3 are 0.040” (1.02mm) diameter with 0.080”
(2.03 mm) diameter standoff shoulders.
Pin No. Name
Function
1
2
Vin(+)
ON/OFF
Input Positive (35V - 55V)
Logic control input to turn
converter on and off.
Input Negative
Output Negative
Output Positive
2) Pins 4 and 5 are 0.062” (1.57 mm) diameter with 0.100”
(2.54 mm) diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
4) All Pins: Material - Copper Alloy
Finish - Matte Tin over Nickel plate
3
4
5
Vin(-)
Vout(-)
Vout(+)
5) Undimensioned components are shown for visual reference
only.
6) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: 1.5 oz. (42 g) typical
8) Workmanship: Meets or exceeds IPC-A-610C Class II
9) UL/TUV standards require a clearance of 0.04” (1.02mm)
around primary areas of the module. Refer to section on
Keep Out Areas under Application Considerations for details.
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
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 2
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
BQ55090QPA40 ELECTRICAL CHARACTERISTICS
TA=25°C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient tem-
perature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
60
55
V
V
Continuous
Operating
Continuous
Isolation Voltage (input to output)
Operating Temperature
2000
100
125
18
V
Basic insulation, Pollution Degree 2
-40
-55
-2
°C
°C
V
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-Off Voltage Threshold
Turn-On Voltage Threshold
Maximum Input Current
35
48
55
V
30
29
2
34
31
4
V
V
V
58.5
57
59.5
58
V
V
9.5
0.13
15
A
100% Load, 35 Vin
No-Load Input Current
A
Disabled Input Current
7.0
mA
2
Inrush Current Transient Rating
Input Reflected Ripple Current
Input Terminal Ripple Current
Recommended Input Fuse
Input Filter Component Values (L\C)
Recommended External Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage Set Point
0.01
10
A s
7
mA
mA
A
RMS through 10µH inductor; Figure 14
RMS; Figure 13
140
20
Fast blow external fuse recommended
0.22\11
47
µH\µF Internal values
µF
V
Typical ESR 0.1-0.2
Ω,
9.6
48Vin, no load
Output Voltage Regulation
Over Line
42\4.0
5.2\500
2\200
%\V
%\mV
%\mV
V
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
6.5
0
11.0
100
43
Over sample, line, load, temperature & life
20MHz bandwidth
50
12
mV
mV
A
Full Load; see Figure 15
Full Load
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Current Share Accuracy (3 units paralleled)
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
Settling Time
Subject to derating
50
5
A
V
+
10
%
Above 50% of rated output current
Negative current drawn from output
9.6Vout at 40A Resistive Load
10
mA
µF
4,000
14
dB
Figure 19
200
100
mV
µs
50%-75%-50% Iout max; Figure 11
To within 1% Vout nom
Turn-On Transient
Turn-On Time (without output capacitance)
Turn-On Time (with output capacitance)
Output Voltage Overshoot
EFFICIENCY
250
5
µs
ms
%
Full load, Vout=90% nom., 0 output cap.
Full load, Vout=90% nom., 3,000 µF cap.
3,000 µF load cap., Iout = 0A, Vin nom.
3
0
93% Load
96.5
97.0
%
%
Figure 1; 48Vin, 40A
Figure 1
50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature (see Note 1)
Board Temperature
125
125
125
°C
°C
°C
Package rated to 175°C
Board rated to 165°C
Transformer Temperature
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
2000
30
V
MΩ
1. For normal operating conditions of 55°C ambient temperature and 200 LFM airflow. Device is designed to operate for a minimum of 72 hours, once per
year under the following conditions: 70°C, 200 LFM airflow, 38Vin, 300W output power. Junction temperature during those conditions will exceed the listed
specification.
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 3
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
P
Min.
Typ.
Max.
Units Notes & Conditions
FEATURE CHARACTERISTICS
Switching Frequency
170
200
230
kHz
ON/OFF Control (Option P)
Off-State Voltage
-1.0
2.4
0.8
18
V
V
On-State Voltage
ON/OFF Control (Option N)
Off-State Voltage
2.4
18
V
On-State Voltage
-1.0
0.8
V
ON/OFF Control (Either Option)
Pull-Up Voltage
Figures A & B
V
10
28
Pull-Up Resistance
k
Ω
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
145
150
°C
°C
Average PCB Temperature
10
3333
See App Note: Output Load Current Calc.
o
4.8
3.3
106 Hrs. TR-NWT-000332; 80% load,300LFM, 40 C T
a
a
106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40 C T
o
106 Hrs. See our website for details
STANDARDS COMPLIANCE
Parameter
P
Notes
STANDARDS COMPLIANCE
UL/cUL 60950-1
EN60950-1
File # E194341, Basic insulation & pollution degree 2
Certified by TUV
72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
Test on entire assembly; board & plastic components UL94V-0 compliant
ESD test, 8kV - NP, 15kV air - NP (Normal Performance)
GR-1089-CORE
Section 7 - electrical safety, Section 9 - bonding/grounding
•
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
P
# Units Test Conditions
QUALIFICATION TESTING
Life Test
32
95% rated Vin and load, units at derating point, 1000 hours
Vibration
5
10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
100g minimum, 2 drops in x and y axis, 1 drop in 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, 85% RH, 1000 hours, 2 minutes on and 6 hours off
MIL-STD-883, method 2003
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
5
10
5
5
5
Solderability
15 pins
•
Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we
supply robust, reliable product. Contact the factory for official product family qualification documents.
OPTIONS
PATENTS
SynQor provides various options for Logic Sense, Pin Length and SynQor is protected under various patents. Please consult the
Feature Set for this family of DC/DC converters. Please consult the last page for further information.
last page of this specification sheet for information on available
options.
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 4
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
100
95
90
85
80
75
70
20
18
16
14
12
10
8
6
35 Vin
48 Vin
55 Vin
35 Vin
48 Vin
55 Vin
4
2
0
0
5
10
15
20
25
30
35
40
0
5
10
15
20
25
30
35
40
Load Current (A)
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for min-
Figure 2: Power dissipation at nominal output voltage vs. load current
imum, nominal, and maximum input voltage at 25
°
C.
for minimum, nominal, and maximum input voltage at 25°C.
98
12
10
8
97
96
95
94
6
4
25 ºC
40 ºC
55 ºC
35V
2
0
48V
55V
100
200
300
400
0
5
10
15
20
25
30
35
40
Air Flow (LFM)
Load Current (A)
Figure 3: Efficiency at nominal output voltage and 60% rated power vs.
Figure 4: Output voltage regulation vs. load current for minimum, nom-
inal, and maximum input voltage at 25 C.
airflow rate for ambient air temperatures of 25
(nominal input voltage).
°C, 40
°C, and 55
°C
°
45
40
35
30
25
20
15
400 LFM (2.0 m/s)
10
5
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0
Semiconductor junction temperature is
within 1 C of surface temperature
25
40
55
Ambient Air Temperature (ºC)
70
85
°
Figure 5: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 100 LFM through 400 LFM with air flow-
ing from pin 3 to pin 1 (nominal input voltage).
Figure 6: Thermal plot of converter at 43 amp load current (400W)
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).
°
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 5
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
45
40
35
30
25
20
15
400 LFM (2.0 m/s)
10
5
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
0
25
40
55
Ambient Air Temperature (ºC)
70
85
Figure 7: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 100 LFM through 400 LFM with air flow-
ing from output to input (nominal input voltage).
Figure 8: Thermal plot of converter at 43 amp load current (400W)
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 3mF output
capacitance (2.0ms/div). Input voltage pre-applied. Channel 1: Vout
(2V/div). Channel 2: ON/OFF input (2V/div).
Figure 10: Turn-on transient at zero load and 3mF output capacitance
(2.0ms/div). Input voltage pre-applied. Channel 1: Vout (2V/div).
Channel 2: ON/OFF input (2V/div).
See Fig. 14
10 µH
See Fig. 13
source
impedance
See Fig. 15
iS
iC
DC/DC
Converter
VOUT
VSOURCE
15
µ
Ω
F,
ESR
1 µF
47 µF,
ceramic
450m
<1
Ω ESR
capacitor
tantalum
electrolytic
capacitor
capacitor
Figure 11: Output voltage response to step-change in load current (50%-75%-
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).
50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 15µF, 100 mΩ ESR tantalum cap
and 1 F ceramic cap. Top trace: Vout (200mV/div), Bottom trace: Iout (10A/div).
µ
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 6
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
Figure 13: Input Terminal Ripple Current, i , at full rated output cur-
Figure 14: Input reflected ripple current, i , through a 10 µH source
s
c
rent and nominal input voltage with 10
µH source impedance and 47
µF
inductor at nominal input voltage and rated load current (5mA/div). See
Figure 12.
electrolytic capacitor (50 mA/div). See Figure 12.
12
10
8
6
4
35 Vin
48 Vin
2
55 Vin
0
0
10
20
30
40
50
60
Load Current (A)
Figure 15: Output voltage ripple at nominal input voltage and rated
load current (50 mV/div). Load capacitance: 1 F ceramic capacitor
and 15 F tantalum capacitor. Bandwidth: 20 MHz. See Figure 12.
Figure 16: Output voltage vs. load current showing typical current limit
curves and converter shutdown points.
µ
µ
1
0.1
0.01
35 Vin
48 Vin
55 Vin
0.001
10
100
1,000
Hz
10,000
100,000
Figure 18: Magnitude of incremental output impedance (Z
=
Figure 17: Load current (10A/div) as a function of time when the con-
verter attempts to turn on into a 1 m short circuit. Top trace
(5.0ms/div) is an expansion of the on-time portion of the bottom trace.
out
v
/i ) for minimum, nominal, and maximum input voltage at full
Ω
out out
rated power.
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 7
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
0
-5
0
-5
-10
-15
-20
-25
-30
-10
-15
-20
-25
-30
35 Vin
48 Vin
55 Vin
35 Vin
48 Vin
55 Vin
10
100
1,000
Hz
10,000
100,000
10
100
1,000
Hz
10,000
100,000
Figure 19: Magnitude of incremental forward transmission (FT =
/v ) for minimum, nominal, and maximum input voltage at full
rated power.
Figure 20: Magnitude of incremental reverse transmission (RT =
v
i
/i ) for minimum, nominal, and maximum input voltage at full rated
out in
in out
power.
1000
100
10
1
35 Vin
48 Vin
55 Vin
0.1
10
100
1,000
Hz
10,000
100,000
Figure 21: Magnitude of incremental input impedance (Z = v /i
in in in
)
for minimum, nominal, and maximum input voltage at full rated power.
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 8
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
the output variation of the BusQor must be in accordance with the
input voltage range of the non-isolated converters being
employed.
BASIC OPERATION AND 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 con-
verters.
The BusQor architecture is very scalable, meaning multiple bus
converters can be connected directly in parallel to allow current
sharing for higher power applications.
CONTROL FEATURES
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
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 volt-
age levels at the points of load. In this case, the bucks are rep-
resented with SynQor’s NiQor series of non-isolated DC/DC con-
verters. In many applications requiring multiple low voltage out-
puts, significant savings can be achieved in board space and
overall system costs.
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 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 uni-
versally ideal bus voltage, most designs employ one of the fol-
lowing: 12V, 9V, 7.5V, 5V, or 3.3V. Higher bus voltages can
lead to lower efficiency for the buck regulators but are more effi-
cient for the bus converter and provide lower board level distrib-
ution current. Lower bus voltages offer the opposite trade offs.
Vin+
5V
100k
On/Off
49.9k
SynQor’s 9.6Vout 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,
TTL
100k
Vin-
3.3 V
Figure B: Internal ON/OFF pin circuitry
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 appli-
cation note titled “Input System Instability”. The lockout circuitry
is a comparator with DC hysteresis. When the input voltage is ris-
ing, 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.
2.5 V
48Vdc
35-55V
9.6Vdc
BusQor
Converter
1.8 V
1.5 V
0.9 V
NiQor
Converters
Loads
Typical User Board
48Vdc
Front
End
Output Current Limit: The output of the BusQor module is
Figure A: Example of Intermediate Bus Architecture using
BusQor bus converter and NiQor non-isolated converters
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 9
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
electronically protected against output overloads. When an over-
load current greater than the “DC Current-Limit Inception” speci-
fication is drawn from the output, the output shuts down to zero
volt in a period of 20ms typical (see Figure C). The shutdown
period lasts for a typical period of 250ms (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 9% (On) and 91% (Off) respectively.
The BusQor module returns (auto resetting) to normal operation
once the overload is removed. The BusQor is designed to survive
cycles of shutdown and restart with a duty cycle of 9% (On) and
91% (Off) respectively. The BusQor module returns (auto reset-
ting) 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 48V input is about 5 Watts, most of
which is dissipated into the external fault. It is important that cop-
per traces and pads from the output circuit be designed to with-
stand the short term peaks, although the average current into the
fault may be as low as 2A typical. See Figure 17 for appropriate
waveform.
Output
Current
53A
43A
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.
Output
Voltage
9.6V
0V
20ms
Time
APPLICATION CONSIDERATIONS
Figure C: Output Overload protection diagram (not to scale)
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 9.6V in a period of 6ms typical. The rise time from 0V to 90%
is 2ms typical.
in this mode indefinitely without damage and without human
intervention.
Output Short Circuit Protection: When the output of the
BusQor module is shorted, a peak current of typically 72A will
flow into the short circuit for a period of about 230ms. The out-
put of the BusQor will shutdown to zero volts for the same period
(Figure D). The shutdown period lasts for a period of 20ms, at the
end of which the BusQor module tries to power up again. If the
short circuit persists, the output voltage will go through repeated
Output
Current
72A peak
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 induc-
tance in the output load circuit.
Output
Voltage
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.
9.6V
Refer to the Control Features section of the data sheet for details
on enabling and disabling methods for N and P logic type mod-
ules.
0V
Time
230ms
20ms
Figure D: Output Short Circuit and Auto-Resetting protection
diagram (not to scale)
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 10
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
For applications that require mounting parts BELOW the BusQor
module, one should be aware of potential high levels of electro-
magnetic interference, in addition to safety keep out. Users are
advised to consult SynQor Applications engineering in such
applications.
Vin
UVLO
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.
On/Off
(N logic)
OFF
ON
t0
t1
t2
t3
t
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.
Vout
12V
Time
4ms
6ms
Bridging Components: Bridging components like EMI filter capac-
itors 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.
3ms
Figure E: Power Up/Down Diagram (not to scale) showing
Start-Up Inhibit Period.
Keep Out Areas:
Note: Referenced keep out widths are adequate to withstand UL's
Basic Insulation Dielectric strength tests for approved PCB mate-
rials. 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.
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 cur-
rent 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.
0.01”
A current sense resistor referenced to the primary input is used
in the equation below to calculate the output load current.
0.023”
Iload = (VRsense(load) - VRsense(no load) ) x 3333
where:
Bridging
Capacitor
0.01”
Iload = output load current
1.50”
V
= voltage across the sense resistor with
Rsense(load)
Primary
Secondary
converter under load
V
= voltage across the sense resistor with
converter at zero load
Rsense(no load)
Figure F: Keep Out Areas for BusQor module
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 11
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
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 current share performance of two paralleled modules is illus-
trated in the graph in Figure J. In this graph the percent deviation
from ideal sharing (50%) is plotted for each module versus the
total output load current at 48Vin.
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 website
titled “Output Load Current Calculations”.
5.0%
4.0%
3.0%
2.0%
1.0%
0.0%
-1.0%
-2.0%
-3.0%
Module 1
-4.0%
Module 2
-5.0%
5
10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85
Total Load Current (A)
Figure J: Current share performance of 2 paralleled modules
Figure G: Location of Sense Resistor
BusQor module
48Vin
CM EMI
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 mod-
ule and located close to the converter for optimum filtering and
noise control performance. Dedicated input inductors are recom-
mended but are considered optional. Input capacitors must be
located close to the converter module. PCB layout in the input cir-
cuit 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 K for details
on PCB layout. Contact SynQor application engineering for fur-
ther assistance on PCB trace design.
filter
Bulk
Cap
BusQor module
(Not shown
in Figure H)
Input LC filters
Figure K: Recommended PCB layout for input circuit
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 available as
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 rohs@synqor.com.
1
5
BusQor module
(N logic option)
9.6Vout
86A
Vin
2
3
4
5
1
BusQor module
(N logic option)
2
3
4
Figure H: BusQor Output Paralleling for increased current output.
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 12
Input:
Output:
Current:
Package:
35-55 V
9.6 V
43 A
Quarter-brick
Technical Specification
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s BusQor DC bus con-
verters 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 55 090 Q P A 40 N N S - G
6/6 RoHS
Options (see
Ordering Information)
Output Current
Output Max Output
Model Number
Input Voltage
35 - 55 V
Voltage
9.6 V
Current
43 A
Thermal Design
Performance Level
Package Size
BQ55090QPA40xyz -G
The following option choices must be included in place of the
Output Voltage
x y z spaces in the model numbers listed above.
Input Voltage
Options Description: x y z
Product Family
Enable
Logic
Pin
Length
Feature
Set
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 indi-
cates the product is 6/6 RoHS compliant.
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
P - Positive
N - Negative *
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 (additional patent applications may be filed)
SynQor holds the following patents, one or more of which might apply to this product:
5,999,417
6,594,159
6,927,987
6,222,742
6,731,520
7,050,309
6,545,890
6,894,468
7,072,190
6,577,109
6,896,526
7,085,146
Contact SynQor for further information:
Warranty
Phone:
978-849-0600
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
Toll Free: 888-567-9596
Fax:
978-849-0602
E-mail:
Web:
power@synqor.com
www.synqor.com
Information furnished by SynQor is believed to be accurate and reliable.
However, no responsibility is assumed by SynQor for its use, nor for any
infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any
patent or patent rights of SynQor.
Address: 155 Swanson Road
Boxborough, MA 01719
USA
Product # BQ55090QPA40
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ559K Rev. A
3/6/07
Page 13
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