BQ50120QTA25PRS [SYNQOR]
Quarter-brick DC Bus Converter; 四分之一砖DC总线转换器
| 型号： | BQ50120QTA25PRS |
| 厂家： | 
SYNQOR WORLDWIDE HEADQUARTERS |
| 描述： | Quarter-brick DC Bus Converter |
| 文件： | 总12页 (文件大小：531K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Technical
Specification
BQ50120QTA25
42-53V
12V
Output
300Watt 2000Vdc Quarter-brick
Input
Power
Isolation
DC Bus Converter
™
The BusQor BQ50120QTA25 bus converter is a next-gen-
eration, board-mountable, isolated, fixed switching frequen-
cy 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 48V to a 12V intermediate bus with no regu-
lation in a standard “quarter-brick” module. BusQor con-
verters are ideal for customers who need multiple outputs
and wish to build or buy point of load converters to work
with a 12V rail. RoHS Compliant (see page 12).
Bus
Converter
Operational Features
BQ50120QTA25 Module
• Ultra-high efficiency, >96% at full rated load current
• Delivers up to 25 amps (300 Watts) of output current
(power) with minimal derating - no heatsink required
• Input voltage range: 42V – 53V
Protection Features
• Fixed frequency switching provides predictable EMI per-
formance
• Input under-voltage lockout and over-voltage
shutdown protects against abnormal input voltages
• Output current limit and short circuit protection
• Output over-voltage 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 0.43” (10.9mm), permits better airflow
and smaller card pitch
• Total weight: 1.5 oz. (42 grams)
Safety Features
• 2000V, 30 MΩ input-to-output isolation
• Flanged pins designed to permit surface mount solder-
ing (can avoid wave solder) using FPiP technique
• UL/cUL 60950-1 recognized (US & Canada), basic
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
• Current sharing allowed without the use of any external
circuitry.
Product # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 1
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
Quarter-brick
Technical Specification
MECHANICAL
2.30
(58.4)
DIAGRAM
0.14
(3.6)
2.00
(50.8)
0.43
(10.8)
Top View
1.45
(36.8)
0.600
(15.24)
0.600
(15.24)
0.300
(7.62)
0.43
(10.9)
Side View
Bottom side
Clearance
See Note 9
Lowest
Component
0.060+/-0.030
(1.52+/-0.76)
Flanged Pin
See Note 10
Load Board
0.145
(3.68)
See Note 3
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 (42V - 53V)
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
3
4
5
Vin(-)
Vout(-)
Vout(+)
Finish (6/6 RoHS) - Matte Tin over Nickel plate
Finish (5/6 RoHS) - Tin/Lead over Nickel plate
5) Undimensioned components are shown for visual reference
only.
6) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: 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 # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 2
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
Quarter-brick
Technical Specification
BQ50120QTA25 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
56
V
V
Continuous
Operating
Continuous
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
2000
100
125
12
V
Basic insulation, Pollution Degree 2
-40
-55
-2
°C
°C
V
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
No-Load Input Current
42
48
53
V
39.5
38.0
1.5
V
V
V
55.0
54.0
V
V
Vin when unit will shut down
Vin when unit turns on after shutdown event
100% Load, 42 Vin
6.8
0.11
15
A
0.07
A
Disabled Input Current
7.5
mA
2
2
Inrush Current Transient Rating
Input Reflected-Ripple Current
Input Terminal-Ripple Current
0.01
A s
I T rating of external fuse should be higher
5
mA
mA
A
RMS through 10µH inductor; Figures 12 & 14
RMS, full load; Figures 12 & 13
75
100
12
1
Recommended Input Fuse
Fast blow external fuse recommended
Input Filter Component Values (C\L\C)
Recommended External Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
1\1\4.4
47
µF\µH\µF Internal values
µF
Typical ESR 0.1-0.2Ω, see Figure 12
12.00
V
48Vin, no load
+
10 \ 1.2
4.1 \ 500
1.7 \ 200
%\V
Figure 4
+
+
Over Load
%\mV Figure 4
%\mV Figure 4
Over Temperature
Total Output Voltage Range
9.7
0
13.3
V
Over sample, line, load, temperature & life
20MHz bandwidth; Figures 12 & 15
Full Load, see Figures 12 & 15
2
Output Voltage Ripple and Noise
Peak-to-Peak
100
25
150
40
mV
mV
A
RMS
Full Load, see Figures 12 & 15
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Current Share Accuracy (2 units paralleled)
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
Settling Time
25
Subject to thermal derating; Figures 5 - 8
Output Voltage 10% Low; Figure 16
34
8
A
V
+
10
%
% of rated output current
10
mA
µF
Negative current drawn from output
12Vout at 25A Resistive Load
3,000
200
100
mV
µs
50% to 75% to 50% Iout max; Figure 11
To within 1% Vout nom
Turn-On Transient
Turn-On Time
500
2
µs
ms
%
Full load, Vout=90% nom.; Figures 9 & 10
-40°C to +125°C; Figure E
Start-Up Inhibit Time
Output Voltage Overshoot
EFFICIENCY
5
5,000 µF load capacitance, Iout = 0A
100% Load
96.1
96.4
%
%
Figure 1
Figure 1
50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
125
125
125
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 5 - 8 for derating curves
Transformer Temperature
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)3
Isolation Resistance
2000
30
V
M
Ω
Isolation Capacitance4
470
pF
Note 1: UL's 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 until fuse blows.
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: support@synqor.com)
Note 3: For modules with isolation voltage rating of 2250V, order the Feature Set option C. See last page for ordering details.
Note 4: Higher values of isolation capacitance can be added external to the module.
Product # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 3
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
Quarter-brick
Technical Specification
ELECTRICAL CHARACTERISTICS (Continued)
Parameter
P
Min.
Typ.
Max.
Units Notes & Conditions
FEATURE CHARACTERISTICS
Switching Frequency
127.5
150
172
kHz
ON/OFF Control (Option P)
Off-State Voltage
Figure B
-1.0
2.4
0.8
18
V
On-State Voltage
V
ON/OFF Control (Option N)
Off-State Voltage
Figure B
2.4
18
V
V
On-State Voltage
-1.0
0.8
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
13.75
120
10
V
Over full temp range; no load
Average PCB Temperature
°C
°C
800
See App Note: Output Load Current Calc.
o
2.7
2.0
106 Hrs. TR-NWT-000332; 100% load,300LFM, 40 C T
a
a
106 Hrs. MIL-HDBK-217F; 100% 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, including but not lim-
Feature Set for this family of DC/DC converters. Please consult the ited to U.S. Patent numbers 5,999,417; 6,222,742 B1;
last page of this specification sheet for information on available 6,594,159 B2; 6,545,890 B2.
options.
Product # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 4
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
Quarter-brick
Technical Specification
12
10
8
100
98
96
94
92
90
88
86
6
4
43 Vin
48 Vin
52 Vin
43 Vin
48 Vin
52 Vin
2
0
0
5
10
15
20
25
0
5
10
15
20
25
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
97
96
95
94
93
92
15
14
13
12
11
10
25 C
40 C
55 C
43Vin
9
48Vin
53Vin
8
0
100
200
300
400
500
0.0
2.5
5.0
7.5
10.0 12.5 15.0 17.5 20.0 22.5 25.0
Load Current (A)
Air Flow (LFM)
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
°
25
20
15
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
5
0
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
50 LFM (0.25 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 tem-
perature for airflow rates of 50 LFM through 400 LFM with air flowing
from pin 3 to pin 1 (nominal input voltage).
Figure 6: Thermal plot of converter at 25 amp load current (300W)
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 # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 5
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
Quarter-brick
Technical Specification
25
20
15
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
5
0
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
50 LFM (0.25 m/s)
0
25
40
55
70
85
Semiconductor junction temperature is
within 1 C of surface temperature
Ambient Air Temperature (oC)
°
Figure 7: Maximum output power derating curves vs. ambient air tem-
perature for airflow rates of 50 LFM through 400 LFM with air flowing
from input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 25 amp load current (300W)
with 55 C air flowing at the rate of 200 LFM. Air is flowing across the
converter from input to output (nominal input voltage).
°
Figure 9: Turn-on transient at full load (resistive load) (100
Ch 1: Vout (5V/div)
µs/div).
Figure 10: Turn-on transient at zero load (100 µs/div). Ch 1: Vout
(5V/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%-
50% of Iout(max); dI/dt = 0.1A/ s). Load cap: 15 F, 100 m ESR tantalum cap
and 1 F ceramic cap. Top trace: Vout (200mV/div), Bottom trace: Iout (5A/div).
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).
µ
µ
Ω
µ
Product # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 6
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
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 (5 mA/div).
See Figure 12.
electrolytic capacitor (100 mA/div). See Figure 12.
14
13
12
11
10
9
8
7
43V
6
48V
5
53V
4
0
5
10
15
20
25
30
35
40
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
Figure 17: Load current (50A/div) as a function of time when the con-
verter attempts to turn on into a 1 m short circuit. Top trace
(500 s/div) is an expansion of the on-time portion of the bottom trace.
Ω
µ
Product # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 7
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
Quarter-brick
Technical Specification
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 a coarse voltage step down in one compact module, leaving
regulation to simpler, less expensive non-isolated converters.
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
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 volt-
age levels at the point 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.
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. Positive logic enabled modules have
N-channel FET populated. Negative logic enabled modules have
P-channel FET populated.
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+
Control
N-channel FET
P-channel FET
SynQor’s 12Vout 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 sys-
tems, the output variation of the BusQor must be in accordance
Vref (8V)
30 k
Ω
5 k
Ω
On/Off
Vin-
13V
100 k
Ω
3.3 V
2.5 V
Figure B: Internal ON/OFF pin circuitry
48Vdc
42-53V
12Vdc
BusQor
1.8 V
1.5 V
PROTECTION FEATURES
Converter
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” available on the
SynQor website. 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 specifica-
tion 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.
0.9 V
NiQor
Converters
Loads
Typical User Board
48Vdc
Front
End
Figure A: Example of Intermediate Bus Architecture using
BusQor bus converter and NiQor non-isolated converters
Product # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 8
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
Quarter-brick
Technical Specification
Output Current Limit: The output of the BusQor module is
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 40µs 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 40µs (On) and 250ms (Off) respec-
tively. The BusQor module returns (auto resetting) to normal oper-
ation once the overload is removed. The BusQor is designed to
survive in this mode indefinitely without damage and without
human intervention.
the short circuit persists, the output voltage will go through repeat-
ed cycles of shutdown and restart with a duty cycle of 350µs
(On) and 250ms (Off) respectively. The BusQor module returns
(auto resetting) to normal operation once the short circuit is
removed. The BusQor is designed to survive in this mode indef-
initely 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 50mA typical. See Figure 17 for appro-
priate waveform.
Output
Current
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.
35A
25A
Output
Voltage
12V
0V
APPLICATION CONSIDERATIONS
Time
40µs
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 350µs is initiated. The output builds up to 90%
or higher of the nominal voltage and stabilizes at the nominal
value of 12V in a period of 420µs typical. The rise time from 0V
to 90% is 70µs typical.
Figure C: Output Overload protection diagram (not to scale)
Output Short Circuit Protection: When the output of the
BusQor module is shorted, a peak current of typically 50 A will
flow into the short circuit for a period of about 300µs. 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 250ms, at
the end of which the BusQor module tries to power up again. If
Output
Current
50A peak
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 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 350µs typical.
<12V
0V
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.
Time
250ms
300µs
Figure D: Output Short Circuit and Auto-Resetting protection
diagram (not to scale)
Product # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 9
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
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 lay-
ers 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
16ms
16.1ms
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 clear-
ance/creepage requirements of 0.04"(40 mils) between pads to
maintain compliance to UL standards for the overall power sys-
tem.
2ms
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
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.
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 cur-
rent is proportional to the voltage drop across this sense resistor.
This calculation is detailed below.
0.01”
0.023”
A current sense resistor referenced to the primary input is used in
the equation below to calculate the output load current.
Iload = (VRsense(load) - VRsense(no load) ) x 800
Bridging
Capacitor
0.01”
where:
1.50”
Iload = output load current
Primary
Secondary
V
= voltage across the sense resistor with
Figure F: Keep Out Areas for BusQor module
Rsense(load)
converter under load
V
= voltage across the sense resistor with
converter at zero load
Rsense(no load)
Product # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 10
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
Quarter-brick
Technical Specification
The number 800 is a “Load Current Scale Factor” for this prod-
uct, valid only for Vin = 48V. Hence, measurement should be
made at this input voltage.
for further assistance on PCB trace design.
The current share performance of two paralleled modules is illus-
trated in the graph in Figure J. In this graph the percent devia-
tion 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 25mV at full
load of 25A. 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”.
10%
8%
6%
4%
2%
0%
-2%
-4%
Module 1
Module 2
-6%
-8%
5
10
15
20
25
30
35
40
Total Load Current (A)
Figure J: Current share performance of 2 paralleled modules
Figure G: Location of Sense Resistors
BusQor module
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 rec-
ommended 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 K for
details on PCB layout. Contact SynQor application engineering
48Vin
CM EMI
filter
Bulk
Cap
BusQor module
(Not shown
in Figure H)
Input LC filters
Figure K: Recommended PCB layout for input circuit
1
5
BusQor module
(N logic option)
12Vout
50A
Vin
2
3
4
5
1
BusQor module
(N logic option)
2
3
4
Figure H: BusQor Output Paralleling for increased current output.
Product # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 11
Input:
42-53 V
Output:
12 V
Current:
25 A
Package:
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. To
order 6/6 RoHS compliant product please add a “-G” suffix.
BQ 50 120 Q T A 25 N N S
Options (see
Ordering Information)
Output Current
Output Max Output
Voltage Current
Model Number
Input Voltage
Thermal Design
Performance Level
Package Size
BQ55090QTA27xyz 36 - 55 V
BQ50120QTA20xyz 42 - 53 V
BQ50120QTA25xyz 42 - 53 V
9.6 V
12 V
12 V
27 A
20 A
25 A
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
Enable
Pin
Feature
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 6/6 RoHS compliance.
Logic
Length
Set
K - 0.110"
S - Standard
C - no common
mode capacitor
P - Positive N - 0.145"
N - Negative R - 0.180"
Y - 0.250"
Units with option C for the Feature Set are a standard unit with
the common mode capacitor removed. The isolation voltage
rating of the C option unit is 2250Vdc.
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
5/6 RoHS compliant (product with lead) or 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.
Application Notes
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
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 # BQ50120QTA25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512M Rev. C
03/17/06
Page 12
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