28A

Technical
Specification
SQ60120QPA28
36-75 V
100 V
12 V
336 W
2250 V dc
Quarter-brick
Input
Transient Input
Output
Max Power
Isolation
DC-DC Converter
The SQ60120QPA28 bus converter is a next-generation,
board-mountable, isolated, fixed switching frequency dcdc converter that uses synchronous rectification to achieve
extremely high conversion efficiency. The SQ BusQor series
provides an isolated step down voltage from 48 V to a semiregulated 12 V intermediate bus. BusQor converters are
ideal for customers who need multiple outputs and wish to
build or buy point of load converters to work with a 12 V
rail. RoHS Compliant (see last page).
®
Operational Features
• High efficiency, 95% at full rated load current
• Delivers up to 28 A of output current (336 W power)
with minimal derating - no heatsink required
SQ60120QPA28 Model
• Wide input voltage range: 36-75 V, with
100 V 100 ms input voltage transient capability
• Fixed frequency switching provides predictable EMI performance
• No minimun load requirement
• 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
Industry standard
Total Open Frame
Total Open Frame
Protection Features
quarter-brick pin-out configuration
size: 2.30" x 1.45" (58.4 x 36.8 mm)
height: 0.483” (12.27 mm)
weight: 1.5 oz (42 g)
Control Features
• On/Off control referenced to input side
• Inherent current share (by droop method) for high current and
parallel applications.
Page No.
Safety Features
• UL 60950-1/R2011-12
• EN60950-1/A2:2013
• CAN/CSA-C22.2 No. 60950-1/A1:2011
Product # SQ60120QPA28
Contents
Phone 1-888-567-9596
Open Frame Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standards & Qualifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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Doc.# 005-2SQ612J Rev. H
05/20/15
Page 1
Technical
Specification
SQ60120QPA28
Open Frame Mechanical Diagram
SIDE VIEW
TOP VIEW
.483± .032
[ 12,27± 0,81]
OVERALL HEIGHT
1.45[36,8]
.600[15,24]
6
.145
[3,68]
SEE NOTE 5
5
2.30
[58,4]
.14
[3,6]
1
2
3
.43[10,8]
.300[7,62]
.600[15,24]
.033± .032
[ 0,84± 0,81]
BOTTOMSIDE
CLEARANCE
NOTES
1)
2)
3)
4)
5)
6)
7)
8)
9)
Pins 1-3 are 0.040” (1.02mm) diameter, with 0.080” (2.03mm)
diameter standoff shoulders.
Pins 5-6 are 0.062” (1.57 mm) diameter with 0.100” (2.54mm)
diameter standoff shoulders.
Other pin lengths available. Recommended pin length is 0.03”
(0.76mm) greater than the PCB thickness.
All Pins: Material - Copper Alloy
Finish: Matte Tin over Nickel plate
Undimensioned components are shown for visual reference only.
All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
Total OF weight: 1.5 oz (42 g)
Workmanship: Meets or exceeds current IPC-A-610 Class II
PIN DESIGNATIONS
Pin
Name
1
2
3
5
6
Vin(+)
ON/OFF
Vin(–)
Vout(–)
Vout(+)
Function
Positive input voltage
Logic control input to turn converter on/off
Negative input
Negative output
Positive output
UL/TUV standards require a clearance of 0.04” (1.02mm) around
primary areas of the module.
10) The flanged pins are designed to permit surface mount soldering
(allowing to avoid the wave soldering process) through the use of
the flanged pin-in-paste technique.
Product # SQ60120QPA28
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Doc.# 005-2SQ612J Rev. H
05/20/15
Page 2
Input: 36-75 V
Output: 12 V
Current: 28A
Package: Quarter-brick
Technical Specification
SQ60120QPA28 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 Vdc unless otherwise noted; full operating temperature range is -40 °C to +100 °C ambient temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Transient Protection
Isolation Voltage
Input to Output
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Maximum Input Current
No-Load Input Current
Disabled Input Current
Input Reflected-Ripple Current
Input Terminal-Ripple Current
Recommended Input Fuse (see Note 1)
Recommended External Input Capacitance
Input Filter Component Values (L\C)
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Start-Up Inhibit Time
Output Voltage Overshoot
Product # SQ60120QPA28
Min.
Typ.
Max.
-1
36
48
100
75
100
V
V
V
2250
100
125
18
V
°C
°C
V
75
V
34.5
32
4
V
V
V
V
V
V
A
mA
mA
mA
mA
A
µF
µH\µF
-40
-45
-2
36
48
31
27.6
2
95
105
7.5
600
12
130
8.5
15
1000
15
47
0.47\6.6
12.46
12.5
12.54
V
12.8
V
V
mV
V
+0.15\-1.25
+0\-0.6
±300
10.6
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150
40
Units Notes & Conditions
RMS through 10 µH inductor
RMS, full load
Fast blow external fuse recommended
Typical ESR 0.1-0.2 Ω
Internal values
Over sample, line, load, temperature & life
20 MHz bandwidth; see Note 2
Full load
Full load
Subject to thermal derating
Output voltage 10% Low
3,000
mV
mV
A
A
V
mA
µF
1500
250
2500
350
mV
µs
50% to 75% to 50% Iout max
To within 1% Vout nom
12
200
0
24
ms
ms
%
Full load, Vout=90% nom.
-40 °C to +125 °C; Figure E
3 mF load capacitance
0
300
100
28
Continuous
Continuous
100 ms transient, square wave
35
10.5
50
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Negative current drawn from output
Vout nominal at full load (resistive load)
Doc.# 005-2SQ612J Rev. H
05/20/15
Page 3
Input: 36-75 V
Output: 12 V
Current: 28A
Package: Quarter-brick
Technical Specification
SQ60120QPA28 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 Vdc 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 Notes & Conditions
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
2250
V
See Absolute Maximum Ratings
Isolation Resistance
30
MΩ
Isolation Capacitance (input to output)
470
pF
See Note 3
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
125
°C
Package rated to 150 °C
Board Temperature
125
°C
UL rated max operating temp 130 °C
Transformer Temperature
125
°C
EFFICIENCY
100% Load
95
%
50% Load
95
%
FEATURE CHARACTERISTICS
Switching Frequency
260
300
275
kHz
ON/OFF Control (Option P)
Off-State Voltage
-1
0.8
V
On-State Voltage
2.4
18
V
ON/OFF Control (Option N)
Off-State Voltage
2.4
18
V
On-State Voltage
-1
0.8
V
ON/OFF Control (Either Option)
Application notes Figure B
Pull-Up Voltage
5.0
V
Pull-Up Resistance
124
kΩ
Output Over-Voltage Protection
16
V
Over full temp range; no load
Over-Temperature Shutdown OTP Trip Point
140
150
°C
Average PCB Temperature
Over-Temperature Shutdown Restart Hysteresis
10
°C
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
2.6
106 Hrs. 80% load, 200 LFM, 40 °C Ta
Calculated MTBF (MIL-217) MIL-HDBK-217F
2.1
106 Hrs. 80% load, 200 LFM, 40 °C Ta
Field Demonstrated MTBF
TBD
106 Hrs. See our website for details
Note 1: UL’s product certification tests were carried out using 15 A fast blow fuse. Fuse interruption characteristics have to be taken into account
while designing input traces. User should ensure that Input trace is capable of withstanding fault currents
Note 2: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Note 3: Isolation capacitance can be added external to the module.
Product # SQ60120QPA28
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Doc.# 005-2SQ612J Rev. H
05/20/15
Page 4
Input: 36-75 V
Output: 12 V
Current: 28A
Package: Quarter-brick
Technical Specification
Standards Compliance & Qualification Testing
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1/R2011-12
Basic insulation
EN60950-1/A2:2013
CAN/CSA-C22.2 No. 60950-1/A1:2011
Note: An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new
releases or download from the SynQor website.
Parameter
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
Product # SQ60120QPA28
# 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.# 005-2SQ612J Rev. H
05/20/15
Page 5
Input: 36-75 V
Output: 12 V
Current: 28A
Package: Quarter-brick
Technical Specification
30
95
25
Power Dissipation (W)
100
Efficiency (%)
90
85
80
36 Vin
75
48 Vin
75 Vin
4
8
12
16
20
Load Current (A)
24
10
36 Vin
48 Vin
75 Vin
0
28
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25 °C.
0
4
8
12
16
Load Current (A)
20
24
28
Figure 2: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25 °C.
14
97
13
96
95
Output Voltage (V)
Efficiency (%)
15
5
70
0
20
94
93
25 ºC
40 ºC
92
91
200
300
11
10
9
36V
48V
8
55 ºC
100
12
7
400
0
Air Flow (LFM)
Figure 3: Efficiency at nominal output voltage and 60% rated power vs. airflow
rate for ambient air temperatures of 25 °C, 40 °C, and 55 °C (nominal input
voltage).
75V
4
8
12
16
Load Current (A)
20
24
28
Figure 4: Power dissipation at nominal output voltage and 60 % rated power vs.
airflow rate for ambient air temperatures of 25 °C, 40 °C, and 55 °C (nominal
input voltage).
30
25
Iout (A)
20
15
10
400
300
200
100
5
LFM (2.0
LFM (1.5
LFM (1.0
LFM (0.5
m/s)
m/s)
m/s)
m/s)
0
25
40
55
70
Semiconductor junction temperature is
within 1°C of surface temperature
85
Ambient Air Temperature (°C)
Figure 5: Maximum output power-derating curve vs. ambient air temperature for
airflow rates of 100 LFM through 400 LFM with air flowing from pin 3 to pin 1
(nominal input voltage).
Product # SQ60120QPA28
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Figure 6: Thermal plot of converter at 23.3 A load current (279.6 W) with 55 °C
air flowing at the rate of 200 LFM. Air is flowing across the converter from pin 3
to pin 1 (nominal input voltage).
www.synqor.com
Doc.# 005-2SQ612J Rev. H
05/20/15
Page 6
Input: 36-75 V
Output: 12 V
Current: 28A
Package: Quarter-brick
Technical Specification
30
25
IOUT (A)
20
15
10
400
300
200
100
5
0
25
40
55
Ambient Air Temperature (oC)
70
85
Figure 7: Maximum output power derating curves vs. ambient air temperature
for airflow rates of 100 LFM through 400 LFM with air flowing across the
converter from output to input (nominal input voltage).
Figure 8: Thermal plot of converter at 21.9 A load current (262.8 W) with 55
°C air flowing at the rate of 200 LFM. Air is flowing across the converter from
output to input (nominal input voltage).
Figure 9: Turn-on transient at half load (resistive load) (2 ms/div). Load cap: 3
mF output capacitance. Input voltage pre-applied. Ch 1: Vout (5 V/div), Ch 2:
ON/OFF input (2 V/div).
Figure 10: Turn-on transient at zero load (2 ms/div). Load cap: 3 mF output
capacitance. Ch 1: Vout (5 V/div), Ch 2: ON/OFF input (2 V/div).
Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1 A/µs). Load cap: 100 µF, 100 mΩ ESR tantalum
cap and 1 µF ceramic cap. Ch 1: Vout (2 V/div), Ch 2: Iout (10 A/div).
Product # SQ60120QPA28
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Doc.# 005-2SQ612J Rev. H
05/20/15
Page 7
Input: 36-75 V
Output: 12 V
Current: 28A
Package: Quarter-brick
Technical Specification
Input
Reflected
Ripple
Current
10µH
source
impedance
Input
Terminal
Ripple
Current
iS
iC
VSOURCE
Output
Voltage
Ripple
DC-DC
Converter
VOUT
1 µF
47 µF,
<1Ω ESR
15 µF,
ceramic 450m Ω ESR
capacitor
tantalum
capacitor
electrolytic
capacitor
Figure 12: Test set-up diagram showing measurement pints for Input Terminal
Ripple Current (Figure 13), Input Reflected Ripple current (Figure 14) and
Output Voltage Ripple (Figure 15).
Figure 13: Input Terminal Ripple Current, ic, at full rated output current and
nominal input voltage with 5 µH source impedance and 47 µF electrolytic
capacitor (500 mA/div). See Figure 12.
Figure 14: Input reflected ripple current, is, through a 5 µH source inductor,
using a 47 µF electrolytic input capacitor (10 mA/div). See Figure 12.
Figure 15: Output voltage ripple at nominal input voltage and rated load current
(50 mV/div). Load capacitance: 1 µF ceramic capacitor and 15 µF tantalum
capacitor. Bandwidth: 20 MHz. See Figure 12.
14
Output Voltage (V)
12
10
8
6
4
36 Vin
48 Vin
2
75 Vin
0
0
5
10
15
20
25
Load Current (A)
30
35
40
45
Figure 16: Output voltage vs. load current showing typical current limit curves
and converter shutdown points.
Product # SQ60120QPA28
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Figure 17: Load current (10 A/div) as a function of time when the converter
attempts to turn on into a 1 mΩ short circuit. Top trace (500 us/div) is an
expansion of the on-time portion of the bottom trace.
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Doc.# 005-2SQ612J Rev. H
05/20/15
Page 8
Input: 36-75 V
Output: 12 V
Current: 28A
Package: Quarter-brick
Technical Specification
0
1
36V
-10
Forward Transmission (dB)
Output Impedance (ohms)
48V
75V
0.1
-20
-30
-40
36V
-50
48V
75V
-60
0.01
10
100
1,000
10,000
100,000
10
1,000,000
100
1,000
Hz
100,000
1,000,000
Figure 19: Magnitude of incremental forward transmission (FT = Vout/Vin) for
minimum, nominal, and maximum input voltage at full rated power.
0
1000
-10
100
Input Impedance (ohms)
Reverse Transmission (dB)
Figure 18: Magnitude of incremental output impedance (Zout = Vout/Iout) for
minimum, nominal, and maximum input voltage at full rated power.
-20
-30
10,000
Hz
36 V
10
1
36 V
48 V
48 V
75 V
75 V
0.1
-40
10
100
1,000
10,000
100,000
10
1,000,000
Hz
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1,000
10,000
100,000
1,000,000
Hz
Figure 20: Magnitude of incremental reverse transmission (RT = Iin/Iout) for
minimum, nominal, and maximum input voltage at full rated power.
Product # SQ60120QPA28
100
Figure 21: Magnitude of incremental input impedance (Zin = Vin/Iin) for
minimum, nominal, and maximum input voltage at full rated power.
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Doc.# 005-2SQ612J Rev. H
05/20/15
Page 9
Technical
Specification
SQ60120QPA28
Application Section
BASIC OPERATION AND FEATURES
CONTROL FEATURES
With voltages dropping and currents rising, the economics
of an Intermediate Bus Architecture (IBA) are becoming
more attractive, especially in systems requiring multiple
low voltages. IBA systems separate the role of isolation and
voltage scaling from regulation and sensing. The BusQor
series bus converter provides isolation and a coarse voltage
step down in one compact module, leaving regulation to
simpler, less expensive non-isolated converters.
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2,
permits the user to control when the converter is on or off.
This input is referenced to the return terminal of the input
bus, Vin(-). There are two versions of the converter that
differ by the sense of the logic used for the ON/OFF input.
In Figure A below, the BusQor module provides the isolation
stage of the IBA system. The isolated bus then distributes
power to the non-isolated buck regulators to generate the
required voltage levels at the point of load. In this case, the
bucks are represented with SynQor’s NiQor series of nonisolated dc-dc converters. In many applications requiring
multiple low voltage outputs, significant savings can be
achieved in board space and overall system costs.
In the positive logic version, the ON/OFF input is active
high (meaning that a high turns the converter on). In the
negative logic version, the ON/OFF signal is active low
(meaning that a low turns the converter on). Figure B is a
detailed look of the internal ON/OFF circuitry.
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: 12 V, 9 V, 7.5 V, 5 V, or 3.3 V.
Higher bus voltages can lead to lower efficiency for the buck
regulators but are more efficient for the bus converter and
provide lower board level distribution current. Lower bus
voltages offer the opposite trade offs.
SynQor’s SQ BusQor modules accept the full 48/60 V
telecom bus voltage and have a narrow output voltage
range compatible with many non-isolated point of load
converters. When used in IBA systems, the output variation
of the BusQor must be in accordance with the input voltage
range of the non-isolated converters being employed.
3.3 V
48Vdc
36-75V
2.5 V
BusQor
Converter
12Vdc
Vin(+)
1.8 V
+5V
5V
124k
1.5 V
0.9 V
Typical User Board
NiQor
Converters
ON/OFF
49.9k
TTL
Loads
100k
48Vdc
Front End
Vin(_)
Figure A: Example of Intermediate Bus Architecture using BusQor bus converter
and NiQor non-isolated converters
Product # SQ60120QPA28
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Figure B: Internal ON/OFF pin circuitry
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Doc.# 005-2SQ612J Rev. H
05/20/15
Page 10
Technical
Specification
SQ60120QPA28
Application Section
Protection Features
Input Under-Voltage Lockout: The converter is designed
to turn off when the input voltage is too low, helping avoid
an input system instability problem, described in more detail
in the application note titled “Input System Instability”
available on www.SynQor.com. The lockout circuitry is a
comparator with DC hysteresis. When the input voltage is
rising, it must exceed the typical Turn-On Voltage Threshold
value (listed on the specification page) before the converter
will turn on. Once the converter is on, the input voltage
must fall below the typical Turn-Off Voltage Threshold value
before the converter will turn off. Also see fig 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
of the BusQor will shutdown to zero volts after the 1 ms
have elapsed (see Figure C). The shutdown period lasts for
a typical period of 200 ms (Figure D) after which the BusQor
tries to power up again. If the overload persists, the output
voltage will go through repeated cycles of shutdown and
restart with a duty cycle of 20 ms (On) and 200 ms (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 BusQor module is shorted, a peak current of typically
55 A will flow into the short circuit for a time of about
1ms. The output of the BusQor will shutdown to zero volts
after the 1 ms have elapsed (Fig C & D). The shutdown
period lasts for a time of 200 ms, 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 20 ms (On)
and 200 ms (Off) respectively. The BusQor module returns
(auto resetting) to normal operation once the short circuit is
removed. The converter is designed to survive in this mode
indefinitely without damage without human intervention.
In the Auto resetting mode, also referred to as “Hiccup”
mode, the power drawn from the 48 V input is about 5
W, 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 50 mA typical. See Figure 17 for appropriate waveform.
Over-Temperature Shutdown: A temperature sensor
on the converter senses the average temperature of the
module. The thermal shutdown circuit is designed to turn
the converter off when the temperature at the sensed
location reaches the Over-Temperature Shutdown value.
It will allow the converter to turn on again when the
temperature of the sensed location falls by the amount of
the Over-Temperature Shutdown Restart Hysteresis value.
Output
Current
Output
Current
35 A
28 A
Output
Voltage
Output
Voltage
<<12V
12V
12 V
0V
0V
1 ms
Time
Figure C: Output Overload protection diagram (not to scale)
Product # SQ60120QPA28
55 A
Peak
peak
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Time
Shutdown
200ms
Period
Duty
20ms
Cycle
Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to scale)
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Doc.# 005-2SQ612J Rev. H
05/20/15
Page 11
Technical
Specification
SQ60120QPA28
Application Section
APPLICATION CONSIDERATIONS
Startup Inhibit Period: Figure E details the Start-Up
Inhibit Period for the BusQor module when Vin is applied
with the On/Off pin asserted (enabled). Before time t1,
when the input voltage Off pin asserted (enabled). 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 8 ms from a Vin start-up.
Once the module recognizes it should be on it waits an
additional 4 ms before it starts. When starting from an on/
off event the module has an inhibit time of 200 ms like our
standard products. The output builds up to 90% or higher
of the nominal voltage and stabilizes to its nominal output
voltage in a total time of 8 ms typical.
At time t2, when the On/Off pin is de-asserted (disabled),
the BusQor module stops switching immediately. Fall time
from 12 V to 0 V is dependent on output capacitance load
current, and any parasitic trace inductance in the output
load circuit.
At time t3, when the On/Off pin is re-asserted (enabled),
the BusQor module output begins to build up after the
inhibit period of 200 ms typical.
Vin
UVLO
On/Off
(N logic)
OFF
ON
t0
t1
t2
t
t3
Vout
12 V
12 ms
Start-up
Inhibit
200 ms
Fault Inhibit
Start-Up
Time
8 ms
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.
Product # SQ60120QPA28
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Doc.# 005-2SQ612J Rev. H
05/20/15
Page 12
Technical
Specification
SQ60120QPA28
Application Section
Droop Current Sharing:
This product has primary side regulation only. Primary side
regulation results in a voltage droop as the load current
increase (droop characteristic). The inherent impedance
of the power stage due to its droop characteristic can be
used to balance the load current between multiple modules
that are placed in parallel. The graphs in this section show
two units by way of example, but there is no fundamental
limit to the number of units that can be placed in parallel.
When multiple units having droop characteristics are placed
in parallel, the current sharing accuracy is determined by the
output voltage set point accuracy relative to the total output
voltage droop for a given load current range. A difference
in voltage between two units will cause a differential current
to flow out of one unit and into the other. Figure F shows an
example with two units with an output voltage mismatched by
0.5%. In this example, when Unit A is at 100% of its full rated
load current, Unit B is only at ~88%, effectively reducing the
total available current by 6%. SynQor uses factory calibration
of each unit to ensure that output voltage is well matched.
Temperature Mismatch Self Balancing: the slope of
the output voltage droop characteristic of semi regulated
module increases with increased temperature. Therefore,
if a paralleled unit were hotter than its neighbor because it
is supplying more load current, then its output voltage will
droop further forcing the cooler module(s) to increase its
load current. The increase in effective output resistance
due to an increase in temperature acts as a self correcting
mechanism (Fig G) when two or more modules are connected
in a parallel configuration.
Droop Characteristics with Voltage Mismatch
0.0%
-0.5%
-0.50%
Output Voltage Droop (% of Nominal)
Output Voltage Droop (% of Nominal)
Droop Characteristics with Temperature Mismatch (Self Balancing)
0.00%
-1.0%
-1.5%
-2.0%
-2.5%
-3.0%
-3.5%
Unit A
-1.00%
-1.50%
-2.00%
-2.50%
-3.00%
-3.50%
Unit A (cooler)
Unit B
Unit B (hotter)
-4.00%
-4.0%
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
0%
100%
Figure F: Example of Droop Characteristic with Output Voltage Mismatch.
Product # SQ60120QPA28
Phone 1-888-567-9596
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Load Current (% of Rated Value)
Load Current (% of Rated Value)
Figure G: Droop Characteristic with Temperature Mismatch (self balancing)
www.synqor.com
Doc.# 005-2SQ612J Rev. H
05/20/15
Page 13
Technical
Specification
SQ60120QPA28
Ordering Information
Part Numbering System
Ordering Information
The part numbering system for SynQor’s dc-dc converters follows the format
shown in the example below.
The tables below show the valid model numbers and ordering options for
converters in this product family. When ordering SynQor converters, please
ensure that you use the complete 15 character part number consisting of
the 12 character base part number and the additional characters for options.
Add “-G” to the model number for 6/6 RoHS compliance.
SQ 6 0 1 2 0 Q P A 2 8 N R S - G
6/6 RoHS
Options
(see
Ordering Information)
Model Number
SQ60120QPw28xyz-G
Input
Voltage
36-75 V
Output
Voltage
12 V
Max Output
Current
28 A
Output Current
Thermal Design
The following options must be included in place of the w x y z spaces in the
model numbers listed above.
Performance Level
Package Size
Thermal Design
Output Voltage
Input Voltage
A - Open Frame
Product Family
The first 12 characters comprise the base part number and the last 3
characters indicate available options. The “-G” suffix indicates 6/6 RoHS
compliance.
Options Description: w x y z
Enable Logic
Pin Style
N - Negative
P - Positive
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
Feature Set
S - Standard
Not all combinations make valid part numbers, please contact SynQor for
availability. See the Product Summary web page for more options.
Application Notes
A variety of application notes and technical white papers can be downloaded
in pdf format from our website.
RoHS Compliance: The EU led RoHS (Restriction of Hazardous
Substances) Directive bans the use of Lead, Cadmium, Hexavalent
Chromium, Mercury, Polybrominated Biphenyls (PBB), and Polybrominated
Diphenyl Ether (PBDE) in Electrical and Electronic Equipment. This SynQor
product is 6/6 RoHS compliant. For more information please refer to
SynQor’s RoHS addendum available at our RoHS Compliance / Lead Free
Initiative web page or e-mail us at [email protected]
PATENTS
SynQor holds numerous U.S. patents, one or more of which apply to most of its power converter
products. Any that apply to the product(s) listed in this document are identified by markings on
the product(s) or on internal components of the product(s) in accordance with U.S. patent laws.
SynQor’s patents include the following:
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # SQ60120QPA28
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
5,999,417
6,222,742
6,545,890
6,594,159
6,731,520
6,894,468
6,896,526
6,927,987
7,050,309
7,072,190
7,085,146
7,119,524
7,269,034
7,272,021
7,272,023
7,558,083
7,564,702
7,765,687
7,787,261
8,023,290
8,149,597
8,493,751
8,644,027
Warranty
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
www.synqor.com
Doc.# 005-2SQ612J Rev. H
05/20/15
Page 14