20A - SynQor

Technical
S pecification
BQ50120QTA20
42-53V
Input
12V
Output
240Watt
Power
2000Vdc
Isolation
Quar ter-brick
DC Bus Conver ter
Th e B u s Qo r ™ B Q 5 0 1 2 0 Q T A 2 0 b u s c o n v e r t e r i s a n e x t generation, board-mountable, isolated, fixed switching
fr eq uen cy d c/d c co nver ter th at u s es sy nc hr on ou s rec tification
t o ac hie ve ext r emel y h ig h co nv er sio n effic ienc y. Th e po w er
d iss ip at e d b y t h e con v ert er is s o l ow t ha t a h ea ts in k is no t
r equ ir ed , w hic h s av es co st , w ei gh t , h eig ht , a n d a p pl ica t ion
Bus
Conver ter
effo rt . Th e Bu sQ or se ries pr ov id es a n is ol a te d s te p d ow n
v ol ta g e fr om 48 V t o a 1 2V in t erme dia t e bu s w i th no
r eg ul a tio n in a st a nd a rd “ q ua r te r- br ick ” mo du l e. B us Q or
co nver ters ar e i dea l fo r cu stom ers who ne ed mu ltip le ou tp uts
a nd wis h to b u ild or b uy p oin t o f lo ad co nver ter s to wo rk with
a 12V rail. RoHS Compliant (see page 12 ).
BQ50120QTA20 Module
Operational Features
• Ultra-high efficiency, >96% at full rated load current
• Delivers up to 20 amps (240 Watts) of output current
(power) with minimal derating - no heatsink required
• Input voltage range: 42V – 53V
• Fixed frequency switching provides predictable EMI
performance
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)
• Flanged pins designed to permit surface mount soldering
(can avoid wave solder) using FPiP technique
Contr ol Features
Pr otection Features
• 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
Safety Features
•
•
•
•
2000V, 30 MW input-to-output isolation
UL 60950-1:R2011-12
EN60950-1/A12:2011
CAN/CSA-C22.2 No. 60950-1/A1:2011
• On/Off control referenced to input side
• Current sharing allowed without the use of any
external circuitry.
Product # BQ50120QTA20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BQ512J Rev. H
11/07/13
Page 1
Input:
Output:
Current:
Package:
Technical Specification
MECHANICAL
DIAGRAM
42-53 V
12 V
20 A
Quarter-brick
2.30
(58.4)
0.14
(3.6)
2.00
(50.8)
0.43
(10.8)
Top View
1.45
(36.8)
0.600
0.600
(15.24)
(15.24)
0.300
(7.62)
0.43
Side View
(10.9)
Bottom side
Clearance
See Note 9
0.060+/-0.030
(1.52+/-0.76)
Lowest
Component
Load Board
Flanged Pin
See Note 10
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.
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 (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 # BQ50120QTA20
Phone 1-888-567-9596
Pin No.
Name
Function
1
Vin(+)
Input Positive (42V - 53V)
2
ON/OFF
Logic control input to turn
converter on and off.
3
Vin(-)
Input Negative
4
Vout(-)
Output Negative
5
Vout(+)
Output Positive
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Doc.# 005-2BQ512J Rev. H
11/07/13
Page 2
Input:
Output:
Current:
Package:
Technical Specification
42-53 V
12 V
20 A
Quarter-brick
BQ50120QTA20 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
temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units
60
56
2000
100
125
12
V
V
V
°C
°C
V
53
V
Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Maximum Input Current
No-Load Input Current
Disabled Input Current
Inrush Current Transient Rating
Input Reflected-Ripple Current
Input Terminal-Ripple Current
Recommended Input Fuse1
Input Filter Component Values (C\L\C)
Recommended External Input Capacitance
-40
-55
-2
42
39.5
38.0
1.5
V
V
V
55.0
54.0
V
V
A
A
mA
A 2s
mA
mA
A
µF\µH\µF
µF
7.5
5
75
1\1.5\2
47
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise2
Peak-to-Peak
RMS
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
48
9.7
0
EFFICIENCY
100% Load
50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
12.00
V
%\V
%\mV
%\mV
V
30
15
24.8
8
+10
10
Isolation Voltage (dielectric strength)3
Isolation Resistance
Isolation Capacitance4
13.3
60
20
20
3,000
mV
mV
A
A
V
%
mA
µF
Vin when unit will shut down
Vin when unit turns on after shutdown event
100% Load, 42 Vin
I2T rating of external fuse should be higher
RMS through 10µH inductor; Figures 12 & 14
RMS, full load; Figures 12 & 13
Fast blow external fuse recommended
Internal values
Typical ESR 0.1-0.2W; see Figure 12
48Vin, no load
Figure 4
Figure 4
Figure 4
Over sample, line, load, temperature & life
20MHz bandwidth; Figures 12 & 15
Full Load; see Figures 12 & 15
Full Load; see Figures 12 & 15
Subject to thermal derating; Figures 5 - 8
Output Voltage 10% Low; Figure 16
% of rated output current
Negative current drawn from output
12Vout at 20A Resistive Load
200
100
mV
µs
50% to 75% to 50% Iout max; Figure 11
To within 1% Vout nom
2.5
2
5
ms
ms
%
Full load, Vout=90% nom.; Figures 9 & 10
-40°C to +125°C; Figure E
5,000 µF load capacitance, Iout = 0A
96.5
96.3
%
%
Figure 1
Figure 1
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
470
V
MW
pF
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
ISOLATION CHARACTERISTICS
100
12
+10 \ 1.2
+4.1 \ 500
+1.7 \ 200
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Start-Up Inhibit Time
Output Voltage Overshoot
6.3
0.17
15
0.01
Continuous
Continuous
Basic insulation, Pollution Degree 2
2000
30
Note 1: Safety product certification tests were carried out using 20A fast blow fuse. Fuse interruption characteristics have to be taken into account
while designing input traces. User should ensure that Input trace is capable of withstanding fault currents until fuse blows.
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
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 # BQ50120QTA20
Phone 1-888-567-9596
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Doc.# 005-2BQ512J Rev. H
11/07/13
Page 3
Input:
Output:
Current:
Package:
Technical Specification
42-53 V
12 V
20 A
Quarter-brick
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control (Option P)
Off-State Voltage
On-State Voltage
ON/OFF Control (Option N)
Off-State Voltage
On-State Voltage
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor
RELIABILITY CHARACTERISTICS
Min.
Typ.
Max.
Units
127.5
150
172
kHz
-1.0
2.4
0.8
18
V
V
2.4
-1.0
18
0.8
V
V
V
°C
°C
13.75
120
10
800
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
2.7
2.0
Notes & Conditions
Figure B
Figure B
Over full temp range; no load
Average PCB Temperature
See App Note: Output Load Current Calc.
106 Hrs. TR-NWT-000332; 100% load,300LFM, 40oC Ta
106 Hrs. MIL-HDBK-217F; 100% load, 300LFM, 40oC Ta
106 Hrs. See our website for details
STANDARDS COMPLIANCE
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1:R2011-12
Basic insulation
EN60950-1/A12:2011
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 # BQ50120QTA20
# 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.# 005-2BQ512J Rev. H
11/07/13
Page 4
Input:
Output:
Current:
Package:
Technical Specification
100
10
9
96
8
Power Dissipation (W)
98
Efficiency (%)
94
92
90
88
86
42 Vin
48 Vin
84
82
7
6
5
4
3
42 Vin
2
48 Vin
1
52 Vin
80
52 Vin
0
0
2
4
6
8
10
12
14
16
18
20
0
2
4
6
Load Current (A)
97
14
Output Voltage (V)
15
96
95
94
25 C
40 C
55 C
93
92
100
200
300
10
12
14
16
18
20
Figure 2: Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25°C.
98
0
8
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
Efficiency (%)
42-53 V
12 V
20 A
Quarter-brick
400
13
12
11
10
42Vin
9
48Vin
52Vin
8
500
0
Air Flow (LFM)
2
4
6
8
10
12
14
16
18
20
Load Current (A)
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).
Figure 4: Output voltage regulation vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
20
18
16
Iout (A)
14
12
10
8
400 LFM (2.0 m/s)
6
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
4
100 LFM (0.5 m/s)
2
0 LFM (0 m/s)
0
0
25
40
55
70
Semiconductor junction temperature is
within 1°C of surface temperature
85
Ambient Air Temperature (oC)
Figure 5: Maximum output power derating curves vs. ambient air
temperature for airflow rates of 0 LFM through 400 LFM with air
flowing from pin 3 to pin 1 (nominal input voltage).
Product # BQ50120QTA20
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Figure 6: Thermal plot of converter at 20 amp load current (240W)
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).
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Doc.# 005-2BQ512J Rev. H
11/07/13
Page 5
Input:
Output:
Current:
Package:
Technical Specification
42-53 V
12 V
20 A
Quarter-brick
20
18
16
Iout (A)
14
12
10
8
400 LFM (2.0 m/s)
6
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
4
100 LFM (0.5 m/s)
2
0 LFM (0 m/s)
0
0
25
40
55
70
Semiconductor junction temperature is
within 1°C of surface temperature
85
Ambient Air Temperature (oC)
Figure 7: Maximum output power derating curves vs. ambient air
temperature for airflow rates of 0 LFM through 400 LFM with air
flowing from input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 20 amp load current (240W)
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) (2 ms/div).
Ch 1: Vout (5V/div); Ch 2: ON/OFF Pin (5V/div).
Figure 10: Turn-on transient at zero load (2 ms/div).
Ch 1: Vout (5V/div); Ch 2: ON/OFF Pin (5V/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 = 0.1A/µ s). Load cap: 15µ F, 100 mW ESR tantalum cap
and 1µ F ceramic cap. Top trace: Vout (200mV/div), Bottom trace: Iout (5A/div).
Product # BQ50120QTA20
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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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Input:
Output:
Current:
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Technical Specification
Figure 13: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 10µ H source impedance and
47µ F electrolytic capacitor (100 mA/div). See Figure 12.
42-53 V
12 V
20 A
Quarter-brick
Figure 14: Input reflected ripple current, is, through a 10 µ H source
inductor at nominal input voltage and rated load current (5 mA/div).
See Figure 12.
14
Output Voltage (V)
13
12
11
10
43V
9
48V
53V
8
0
5
10
15
20
25
Load Current (A)
Figure 15: Output voltage ripple at nominal input voltage and rated
load current (20 mV/div). Load capacitance: 1µ F ceramic capacitor
and 15µ 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.
Figure 17: Load current (20A/div) as a function of time when the
converter attempts to turn on into a 1 mW short circuit. Top trace
(200µs/div) is an expansion of the on-time portion of the bottom trace.
Product # BQ50120QTA20
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Input:
Output:
Current:
Package:
Technical Specification
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.
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.
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.
42-53 V
12 V
20 A
Quarter-brick
systems, the output variation of the BusQor must be in
accordance with the input voltage range of the non-isolated
converters being employed.
The BusQor architecture is very scalable, meaning multiple bus
converters can be connected directly in parallel to allow current
sharing for higher power applications.
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 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
Vin+
Control
N-channel FET
P-channel FET
Vref (8V)
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
30 kW
5 kW
13V
On/Off
100 kW
3.3 V
Vin-
2.5 V
48Vdc
42-53V
BusQor
Figure B: Internal ON/OFF pin circuitry
12Vdc
Converter
P
-
channel FET populated.
1.8 V
1.5 V
PROTECTION FEATURES
0.9 V
Typical User Board
NiQor
Loads
Converters
48Vdc
Front
End
Figure A: Example of Intermediate Bus Architecture using
BusQor bus converter and NiQor non-isolated converters
Product # BQ50120QTA20
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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” 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
specification page) before the converter will turn on. Once the
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Input:
Output:
Current:
Package:
Technical Specification
converter is on, the input voltage must fall below the typical TurnOff Voltage Threshold value before the converter will turn off.
Also see Figure E.
Output Current Limit: The output of the BusQor module is
electronically protected against output overloads. When an
overload current greater than the “DC Current-Limit Inception”
specification is drawn from the output, the output shuts down to
zero volt in a period of 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
Output
Current
25A
20A
Output
Voltage
12V
0V
40µs
Time
Figure C: Output Overload protection diagram (not to scale)
(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 Short Circuit Protection: When the output of the
Output
Current
40A peak
Output
Voltage
42-53 V
12 V
20 A
Quarter-brick
BusQor module is shorted, a peak current of typically 40 A will
flow into the short circuit for a period of about 300µs. The output
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
the short circuit persists, the output voltage will go through
repeated 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
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 50mA 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 OverTemperature 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.
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 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.
At time t2, when the On/Off pin is de-asserted (disabled), the
BusQor output instantly drops to 0V. Fall time from 12V to 0V is
dependent on output capacitance and any parasitic trace
inductance in the output load circuit.
<12V
0V
250ms
Time
300µs
Figure D: Output Short Circuit and Auto-Resetting protection
diagram (not to scale)
Product # BQ50120QTA20
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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.
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Doc.# 005-2BQ512J Rev. H
11/07/13
Page 9
Input:
Output:
Current:
Package:
Technical Specification
42-53 V
12 V
20 A
Quarter-brick
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.
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
Vout
12V
Time
16ms
2ms
16.1ms
Figure E: Power Up/Down Diagram (not to scale) showing
Start-Up Inhibit Period.
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:
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.
0.01”
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
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.
Output Load Current Calculation: The BusQor series
allows the converter output load to be measured without adding
a current loop or external shunt resistor to the designer’s PCB
board under test. On the top side of the BusQor converter is a
current sense resistor as shown in Figure G. The output load
current is proportional to the voltage drop across this sense
resistor. This calculation is detailed below.
A current sense resistor referenced to the primary input is used in
the equation below to calculate the output load current.
0.023”
Iload = (VRsense(load) - VRsense(no load) ) x 800
where:
Bridging
Capacitor
0.01”
1.50”
Primary
Phone 1-888-567-9596
VRsense(load) = voltage across the sense resistor with
converter under load
Secondary
VRsense(no load) = voltage across the sense resistor with
Figure F: Keep Out Areas for BusQor module
Product # BQ50120QTA20
Iload = output load current
converter at zero load
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Doc.# 005-2BQ512J Rev. H
11/07/13
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Input:
Output:
Current:
Package:
Technical Specification
The voltage drop across the sense resistor is about 25mV at full
load of 20A. 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”.
for further assistance on PCB trace design.
The current share performance of two paralleled modules is
illustrated 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.
10%
Deviation from 50/50 Sharing (%)
The number 800 is a “Load Current Scale Factor” for this
product, valid only for Vin = 48V. Hence, measurement should
be made at this input voltage.
42-53 V
12 V
20 A
Quarter-brick
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
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 K for
details on PCB layout. Contact SynQor application engineering
1
BusQor module
CM EMI
filter
Bulk
Cap
BusQor module
(Not shown
in Figure H)
Input LC filters
Figure K: Recommended PCB layout for input circuit
5
BusQor module
(N logic option)
Vin
48Vin
12Vout
40A
2
3
4
1
5
BusQor module
(N logic option)
2
3
4
Figure H: BusQor Output Paralleling for increased current output.
Product # BQ50120QTA20
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www.synqor.com
Doc.# 005-2BQ512J Rev. H
11/07/13
Page 11
Input:
Output:
Current:
Package:
Technical Specification
42-53 V
12 V
20 A
Quarter-brick
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 50 120 Q T A 20 N N S - G
6/6 RoHS
Options (see
Ordering Information)
Output Current
Thermal Design
Performance Level
Package Size
Output Voltage
Product Family
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:
6,545,890
6,896,526
7,119,524
7,564,702
8,493,751
6,577,109
6,927,987
7,269,034
7,765,687
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Product # BQ50120QTA20
.
.
.
.
.
.
.
.
.
.
.
.
36 - 55 V
42 - 53 V
42 - 53 V
.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
Enable
Logic
P - Positive
N - Negative
Pin
Length
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
Feature
Set
S - Standard
C - no common
mode capacitor
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
6/6 RoHS compliant. For more information please refer to
SynQor’s RoHS addendum available at our RoHS Compliance /
Lead Free Initiative web page or e-mail us at [email protected]
6,594,159
7,050,309
7,272,021
7,787,261
Contact SynQor for further information and to order:
Phone: . .
Toll Free:
Fax: . . . .
E-mail: . .
Web: . . .
Address: .
BQ55090QTA27 xyz
BQ50120QTA20 xyz
BQ50120QTA25 xyz
Output Max Output
Voltage
Current
9.6 V
27 A
12 V
20 A
12 V
25 A
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.
6,222,742
6,894,468
7,085,146
7,558,083
8,149,597
Input Voltage
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Input Voltage
5,999,417
6,731,520
7,072,190
7,272,023
8,023,290
Model Number
Warranty
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
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.
www.synqor.com
Doc.# 005-2BQ512J Rev. H
11/07/13
Page 12