20A (240W)

Technical
Specification
SQ60120ETA20
35-75V
100V
Continuous Input Transient Input
12V
240W
2250V dc
Eighth-brick
Output
Max Power
Isolation
DC-DC Converter
The BusQor SQ60120ETA20 bus converter is a nextgeneration, board-mountable, isolated, fixed switching
frequency dc-dc converter that uses synchronous
rectification to achieve extremely high conversion
efficiency. The power dissipated by the converter is
so low that a heatsink is not required, which saves
cost, weight, height, and application effort. The SQ
BusQor series provides an isolated step down voltage
from 48V to a semi-regulated 12V 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 12V rail. RoHS Compliant
(see last page).
®
SQ60120ETA20 Model
Operational Features
• Ultra-high efficiency, 94% at full rated load current
• Delivers 20A (240W) power with minimal derating
- no heatsink required
• Wide input voltage range: 35-75Vdc
with 100V 100ms input voltage transient capability
• Fixed frequency switching provides predictable EMI
Mechanical Features
• Industry standard eighth-brick pin-out configuration
• Size: 0.90” x 2.3” (22.9x58.4mm), 0.498” (12.65mm)
• Total weight: 1.25 oz (35 g)
Control Features
• On/Off control referenced to input side
• Inherent current share (by droop method) for high current
and parallel applications.
Protection 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
Contents
Page No.
Safety Features
• UL 60950-1/R2011-12
• EN60950-1/A2:2013
• CAN/CSA-C22.2 No. 60950-1/A1:2011
Product # SQ60120ETA20
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Open Frame Mechanical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standards & Qualifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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Doc.# 005-0005817 Rev. F
04/15/2015
Page 1
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
Open Frame Mechanical Diagram
.90
[22,9]
.498 ±.032
[12,65 ±0,81]
OVERALL HEIGHT
.600
[15,24]
5
.033 ±.030
[0,84 ±0,76]
BOTTOMSIDE
CLEARANCE
4
2.30
[58,4]
2.000
[50,8]
.14
[3,6]
1
2
3
.300 [7,62]
.15 [3,8]
.180 [4,57]
SEE NOTE 3
.600 [15,24]
NOTES
PIN DESIGNATIONS
1) PINS 1-3 ARE 0.040" (1.02mm) DIA. WITH
0.080" (2.03mm) DIA. STANDOFF SHOULDERS
2) PINS 4 & 5 ARE 0.062" (1.57mm) DIA. WITH 0.100"
(2.54mm) DIA. STANDOFF SHOULDERS
3) OTHER PIN EXTENSION LENGTHS AVAILABLE
4) ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
5) UNDIMENSIONED COMPONENTS ARE SHOWN FOR VISUAL
REFERENCE ONLY
6) ALL DIMENSIONS IN INCHES(mm)
TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
7) MAXIMUM AREA THAT THE THERMAL TRANSFER MATERIAL IS
DEPOSITED
8) WEIGHT: 1.25 OZ (35 G) TYPICAL
9) WORKMANSHIP: MEETS OR EXCEEDS IPC-A-610C CLASS II
10) UL/TUV STANDARDS REQUIRE A CLEARANCE OF 0.04” (1.02MM)
AROUND PRIMARY AREAS OF THE MODULE.
Product # SQ60120ETA20
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Pin
Name
Function
1
Vin(+)
2
ON/OFF
3
4
5
Vin(-)
Vout(-)
Vout(+)
Positive Input Voltage
TTL input to turn converter
on and off, referenced to
Vin (-) with internal pull up
Negative input voltage
Negative output voltage
Positive output voltage
Doc.# 005-0005817 Rev. F
04/15/2015
Page 2
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
Technical Specification
SQ60120ETA20 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C ambient temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Transient Protection
Isolation Voltage
Input to Output
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Maximum Input Current
No-Load Input Current
Disabled Input Current
Input Reflected-Ripple Current
Input Terminal-Ripple Current
Recommended Input Fuse (see Note 1)
Recommended External Input Capacitance
Input Filter Component Values (L\C)
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
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 # SQ60120ETA20
Min.
Typ.
Max.
-1
35
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
35
48
31
27.6
2
95
105
6
125
7.4
90
8.5
10
300
15
47
2.2\4.4
12.46
12.5
12.54
V
12.60
V
V
mV
V
+0.1\-1.2
+0\-0.8
±300
10.20
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140
60
Units Notes & Conditions
RMS through 10µH inductor
RMS, full load
Fast blow external fuse recommended
Typical ESR 0.1-0.2 Ω
Internal values
Vin = 65 V; Io = 0 A
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
1300
750
2500
1200
mV
µs
See Note 3
50% to 75% to 50% Iout max
To within 1% Vout nom
12
200
0
17
ms
ms
%
Full load, Vout=90% nom.
-40 °C to +125 °C; Figure E
3 mF load capacitance
0
180
80
20
Continuous
Continuous
100 ms transient, square wave
27
7
50
www.synqor.com
Negative current drawn from output
Vout nominal at full load (resistive load)
Doc.# 005-0005817 Rev. F
04/15/2015
Page 3
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
Technical Specification
SQ60120ETA20 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48 V dc unless otherwise noted; full operating temperature range is -40 °C to +100 °C ambient temperature
with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance (input to output)
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
EFFICIENCY
100% Load
50% Load
FEATURE CHARACTERISTICS
Switching Frequency
202
ON/OFF Control (Option P)
Off-State Voltage
-1
On-State Voltage
2.4
ON/OFF Control (Option N)
On-State Voltage
-1
Off-State Voltage
2.4
ON/OFF Control (Either Option)
Pull-Up Voltage
Pull-Up Resistance
Output Over-Voltage Protection
Over-Temperature Shutdown OTP Trip Point
135
Over-Temperature Shutdown Restart Hysteresis
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
Calculated MTBF (MIL-217) MIL-HDBK-217F
Field Demonstrated MTBF
Max.
2250
30
N/A
125
125
125
94
95
230
Units Notes & Conditions
V
MΩ
pF
See Absolute Maximum Ratings
°C
°C
°C
Package rated to 150 °C
UL rated max operating temp 130 °C
See Note 4
%
%
257
kHz
0.8
18
V
V
0.8
18
V
V
Application notes Figure B
5
124
16
145
10
3.2
2.9
V
k?
V
°C
°C
Over full temp range; no load
Average PCB Temperature
106 Hrs. 80% load, 300LFM, 40 °C Ta
106 Hrs. 80% load, 300LFM, 40 °C Ta
106 Hrs. See our website for details
Note 1: Safety certification tests were carried out using 15A 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: For full-load to no-load transient, OVP shutdown may occur with less than 660µF external capacitance having less than 8mΩ of ESR
Note 4: Isolation capacitance can be added external to the module.
Product # SQ60120ETA20
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Doc.# 005-0005817 Rev. F
04/15/2015
Page 4
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
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 # SQ60120ETA20
# 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.# 005-0005817 Rev. F
04/15/2015
Page 5
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
Technical Specification
100
20
95
Power Dissipation (W)
90
Efficiency (%)
85
80
75
70
35 Vin
10
5
35 Vin
48 Vin
65
48 Vin
75 Vin
75 Vin
60
0
0
10
20
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
0
10
20
Load Current (A)
Figure 2: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
97
10
Power Dissipation (W)
96
Efficiency (%)
15
95
94
25 ºC
93
9
8
7
25 ºC
40 ºC
40 ºC
55 ºC
55 ºC
6
92
100
200
Air Flow (LFM)
300
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).
30
100
400
200
Air Flow (LFM)
300
400
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).
Thermal Derating for Vin = 48 V;
orientation: pin 3 To pin 1
25
IOUT (A)
20
15
400
10
300
200
5
100
0
25
40
55
Ambient Air Temperature (oC)
70
Figure 5: Maximum output power derating curves vs. ambient air temperature
for airflow rates of 100 LFM through 400 LFM with air flowing from pin 3 to pin
1 (nominal input voltage).
Product # SQ60120ETA20
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Semiconductor junction temperature is
within 1°C of surface temperature
85
Figure 6: Thermal plot of converter at 14.7 A load current (maximum 125ºC
derating current) with 55ºC 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.# 005-0005817 Rev. F
04/15/2015
Page 6
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
Technical Specification
30
Derating Curves for Vin =48 V;
orientation: output to input
25
IOUT (A)
20
15
400
10
300
200
5
100
0
25
40
55
o
Ambient Air Temperature ( C)
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 from output to
input (nominal input voltage).
Figure 8: Thermal plot of converter at 13.5 A load current (max 125ºC derating
current) with 55ºC air flowing at the rate of 200 LFM. Air is flowing across the
converter from output to input (nominal input voltage).
Figure 9: Turn-on transient at half load (resistive load) and 3 mF output
capacitance (2.0 ms/div). Input voltage pre-applied. CH1: Vout (5V/div). CH2:
ON/OFF input (2V/div). Vin = 48 V.
Figure 10: Turn-on transient at zero load and 3 mF output capacitance (2.0 ms/
div). Input voltage pre-applied. CH1: Vout (5 V/div). CH2: ON/OFF input (2
V/div). Vin = 48 V.
Input
Reflected
Ripple
Current
source
impedance
iS
Input
Terminal
Ripple
Current
iC
Output
Voltage
Ripple
DC-DC
Converter
VOUT
VSOURCE
electrolytic
capacitor
Figure 11: Output voltage response to step-change in load current (50%-75%50%) of Iout (max); dI/dt = 0.1 A/µs). Load cap 100 µF, 100 mΩ ESR tantalum
cap. Top trace: Vout (2 V/div), Ch2: Iout (10A/div). Vin = 48 V
Product # SQ60120ETA20
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ceramic electrolytic
capacitor capacitor
Figure 12: Test set-up diagram showing measurement points for Input Terminal
Ripple Current (Figure 13), Input Reflected Ripple Current (Figure 14), and
Output Voltage Ripple (Figure 15).
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Doc.# 005-0005817 Rev. F
04/15/2015
Page 7
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
Technical Specification
Figure 13: Input Terminal Ripple Current, ic, at full rated output current and
nominal input voltage with 10 µH source impedance and 47 µF electrolytic
capacitor (200 mA/div). See Figure 12.
Figure 14: Input reflected ripple current, is, through a 10 µH source inductor at
nominal input voltage and rated load current (10 mA/div). See Figure 12.
14
Output Voltage (V)
12
10
8
6
4
35 Vin
48 Vin
2
75 Vin
0
0
Figure 15: Output voltage ripple at nominal input voltage and rated load current
(100 mV/div). Load capacitance: 1 µF ceramic capacitor and 15 µF tantalum
capacitor. Bandwidth: 20 Mhz. See Figure 12.
10
20
Load Current (A)
30
40
Figure 16: Output voltage vs. load current showing typical current limit curves
and converter shutdown points.
Output Impedance (ohms)
10
1
0.1
0.01
35 Vin
48 Vin
0.001
75 Vin
0.0001
10
Figure 17: Load Current (50 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. Vin = 48V
Product # SQ60120ETA20
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100
1,000
Hz
10,000
100,000
1,000,000
Figure 18: Magnitude of incremental output impedance for minimum, nominal,
and maximum input voltage at full rated power.
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Doc.# 005-0005817 Rev. F
04/15/2015
Page 8
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
Technical Specification
15
10
5
Reverse Transmission (dB)
Forward Transmission (dB)
0
-10
-20
-30
35 Vin
-40
48 Vin
-5
-15
-25
-35
35 Vin
48 Vin
-45
75 Vin
75 Vin
-55
-50
10
100
1,000
Hz
10,000
10
100,000
Figure 19: Magnitude of incremental forward transmission for minimum,
nominal, and maximum input voltage at full rated power.
100
1,000
Hz
10,000
100,000
1,000,000
Figure 20: Magnitude of incremental reverse transmission for minimum,
nominal, and maximum input voltage at full rated power.
Input Impedance (ohms)
1000
100
10
35 Vin
1
48 Vin
75 Vin
0.1
10
100
1,000
Hz
10,000
100,000
Figure 21: Magnitude of incremental input impedance for minimum, nominal,
and maximum input voltage at full rated power.
Product # SQ60120ETA20
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Doc.# 005-0005817 Rev. F
04/15/2015
Page 9
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
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: 12V, 9V, 7.5V, 5V, or 3.3V.
Higher bus voltages can lead to lower efficiency for the buck
regulators but are more efficient for the bus converter and
provide lower board level distribution current. Lower bus
voltages offer the opposite trade offs.
SynQor’s SQ BusQor modules accept the full 48/60V
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.
3.3V
48Vdc
35-75V
2.5V
BusQor
Converter
12Vdc
Vin(+)
1.8V
+5V
5V
124k
1.5V
0.9V
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 # SQ60120ETA20
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Figure B: Internal ON/OFF pin circuitry
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Doc.# 005-0005817 Rev. F
04/15/2015
Page 10
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
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 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 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 200ms (Figure D) after which the
BusQor tries to power up again. If the overload persists, the
output voltage will go through repeated cycles of shutdown
and restart with a duty cycle of 20ms (On) and 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 65A
will flow into the short circuit for a time of about 20ms. The
output of the BusQor will shutdown to zero volts after the
20ms have elapsed (Figure D). The shutdown period lasts
for a time of 200ms, at the end of which the BusQor module
tries to power up again. If the short circuit persists, the
output voltage will go through repeated cycles of shutdown
and restart with a duty cycle of 20ms (On) and 200ms (Off)
respectively. The BusQor module returns (auto resetting)
to normal operation once the 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 48 V 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 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
30A
20A
Output
Voltage
Output
Voltage
<12V
<12V
12V
0V
0V
1ms
Time
Figure C: Output Overload protection diagram (not to scale)
Product # SQ60120ETA20
55A
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.# 005-0005817 Rev. F
04/15/2015
Page 11
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
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 8ms from a Vin start-up.
Once the module recognizes it should be on it waits an
additional 4ms before it starts. When starting from an on/
off event the module has an inhibit time of 200ms 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 15ms typical.
At time t2, when the On/Off pin is de-asserted (disabled),
the BusQor module stops switching immediately. Fall time
from 12V to 0V 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 200ms typical.
Vin
UVLO
On/Off
(N logic)
OFF
ON
t0
t1
t2
t
t3
Vout
12V
12 ms
Start-up
Inhibit
200 ms
Fault Inhibit
Start-Up
Time
15 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 # SQ60120ETA20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005817 Rev. F
04/15/2015
Page 12
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
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 90%, effectively reducing the
total available current by 5%. 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 (Figure 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%
100%
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Load Current (% of Rated Value)
Load Current (% of Rated Value)
Figure F: Example of Droop Characteristic with Output Voltage Mismatch. Figure G: Droop Characteristic with Temperature Mismatch
(self balancing)
Product # SQ60120ETA20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005817 Rev. F
04/15/2015
Page 13
f
f
Input:35-75V
Output:12V
Current:20A
Part No.:SQ60120ETA20
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 E T A 2 0 N R S - G
6/6 RoHS
Options
(see
Ordering Information)
Output Current
Model Number
SQ60120ETA20xyz-G
Input
Voltage
35-75V
Output
Voltage
12V
Max Output
Current
20A
The following options must be included in place of the w x y z spaces in the
model numbers listed above.
Thermal Design
Performance Level
Options Description: w x y z
Package Size
Thermal Design Enable Logic Pin Style
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.
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.
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
Contact SynQor for further information and to order:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # SQ60120ETA20
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
SynQor holds numerous U.S. patents, one or more of which apply to most of its power converter
products. Any that apply to the product(s) listed in this document are identified by markings on
the product(s) or on internal components of the product(s) in accordance with U.S. patent laws.
SynQor’s patents include the following:
5,999,417
6,222,742
6,545,890
6,594,159
6,731,520
6,894,468
6,896,526
6,927,987
7,050,309
7,072,190
7,085,146
7,119,524
7,269,034
7,272,021
7,272,023
7,558,083
7,564,702
7,765,687
7,787,261
8,023,290
8,149,597
8,493,751
8,644,027
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.# 005-0005817 Rev. F
04/15/2015
Page 14