MCOTS-B-270-31

MCOTS-B-270-31-HT
Single Output
Half-brick
Military COTS DC‑DC Bus Converters
230-400 V
31 V
32 A
4250 Vdc
Half-brick
Input
Output
Current
Isolation
DC-DC Converter
Full Operating Temperature Range is -55 °C to +100 °C
The MCOTS-B-270-31-HT 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 MCOTS series provides an isolated step
down voltage from 270 V to 31 V intermediate bus with
no regulation in a standard half-brick module. The
MCOTS-B-270-31-HT converter is ideal for creating the
mid-bus voltage required to drive standard 31 V DC-DC
isolated converters.
Protection Features
• Input under-voltage and over voltage lockout protects
against abnormal input voltages
• Output current limit and short circuit protection (auto recovery)
• Thermal shutdown
Control Features
Designed and manufactured in the USA.
Operational Features
•
•
•
•
•
High efficiency, 95.2% at full rated load current
Delivers 32.5 A full power with minimal derating
Operating input voltage range: 230-400 V
Fixed frequency switching provides predictable EMI
No minimum load requirement
• On/Off control referenced to input side
• Inherent current share (by droop method) for high current and
parallel applications.
• Clock synchronization (primary referenced)
Safety Features
• 4250V dc, 100 MΩ input-to-output isolation
• (see Standards and Qualifications page)
Mechanical Features
• Industry standard half-brick pin-out configuration
Screening/Qualification
• Size: 2.39” x 2.49” x 0.51" (60.6 x 63.1 x 13.0 mm)
• Total Baseplate weight: 4.8 oz (137 g)
Specification Compliance
MCOTS series converters (with an MCOTS filter) are designed to meet:
•MIL-HDBK-704 (A-F)
•RTCA/DO-160E Section 16
•MIL-STD-1275 (B,D)
•DEF-STAN 61-5 (Part 6)/(5 or 6)
•MIL-STD-461 (C, D, E, F)
Product # MCOTS-B-270-31-HT
Phone 1-888-567-9596
• AS9100 and ISO 9001 certified facility
• Qualified to MIL-STD-810
• Available with S-Grade or M-Grade screening
• Temperature cycling per MIL-STD-883, Method 1010,
Condition B, 10 cycles
• Burn-In at 100°C baseplate temperature
• Final visual inspection per MIL-STD-883, Method 2009
• Full component traceability
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 1
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Electrical Characteristics
MCOTS-B-270-31-HT Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 270 V dc unless otherwise noted; full operating temperature range is -55 °C to +100 °C baseplate
temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Isolation Voltage
Input to Output
Input to Baseplate
Output to Baseplate
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 > 0.1 s
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 2)
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
EFFICIENCY
100% Load
50% Load
Product # MCOTS-B-270-31-HT
Typ.
-0.5
V
V
4250
2150
2150
100
135
18
Vdc
Vdc
Vdc
°C
°C
V
400
450
V
V
4.85
10
4.7\0.47
V
V
V
V
V
V
V
A
mA
mA
mA
mA
A
µF
µH\µF
29.7
V
63\19.6
2.6\800
1\300
%\V
%\mV
%\mV
V
270
270
152
147
5
410
420
475
39
3
15
80
30
10
25.2
46.2
150
50
0
Phone 1-888-567-9596
Units Notes & Conditions
500
475
-55
-65
-2
230
155
Max.
300
32.5
38
20
20
2,000
95.2
95.4
www.synqor.com
mV
mV
A
A
V
mA
µF
Continuous
See Note 1
Continuous
Transient, 100 ms, dv/dt < 0.5 V/µs
Vin = 230 V
RMS through 10 µH inductor
RMS, full load
Fast blow external fuse recommended
Typical ESR 0.1-0.2 Ω
Internal values
Vin = 270 V, Io = 0 A
Over sample, line, load, temperature & life
20 MHz bandwidth; see Note 3
Full load
Full load
Subject to thermal derating; Vin = 270 V
Vin = 270 V
Vin = 270 V
Negative current drawn from output
31 Vout at 16 A Resistive Load
%
%
Doc.# 005-0006322 Rev. C
02/08/2016
Page 2
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Electrical Characteristics
MCOTS-B-270-31-HT Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 270 V dc unless otherwise noted; full operating temperature range is -55 °C to +100 °C baseplate
temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
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 (with 2 mF output capacitance)
Start-Up Inhibit Time
Output Voltage Overshoot
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance (input to output)
TEMPERATURE MODEL FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Core Temperature
Maximum Baseplate Temperature, Tb
FEATURE CHARACTERISTICS
Switching Frequency (fs)
255
Clock Synchronization
500
ON/OFF Control
On-State Voltage
-1
Off-State Voltage
2.4
ON/OFF Control
Pull-Up Voltage
Pull-Up Resistance
Over-Temperature Shutdown OTP Trip Point
140
Over-Temperature Shutdown Restart Hysteresis
RELIABILITY CHARACTERISTICS
Calculated MTBF per MIL-HDBK-217F
Calculated MTBF per MIL-HDBK-217F
Typ.
Max.
650
100
20
250
0
mV
µs
50% to 75% to 50% Iout max
To within 1% Vout nom
30
ms
ms
%
Half load (resistive), Vout=90% nom; Note 4
Figure F
2 mF load capacitance
4250
V
MΩ
pF
See Absolute Maximum Ratings
125
125
125
100
°C
°C
°C
°C
Package rated to 150 °C
UL rated max operating temp 130 °C
295
600
kHz
kHz
Fundamental ripple frequency is 2 x fs
Logic level high not to exceed 3.3 V
0.4
18
V
V
100
N/A
275
Units Notes & Conditions
Note 5
Application notes Figure B
5
82.5
150
10
1.43
0.47
V
kΩ
°C
°C
Average PCB Temperature
106 Hrs. Ground Benign, 70 °C Tb
106 Hrs. Ground Mobile, 70 °C Tb
Note 1: Converter will undergo input over-voltage shutdown.
Note 2: UL’s product certification tests were carried out using 10 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 3: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Note 4: Starting up under full load can result in hic-up operation (shut down).
Note 5: Isolation capacitance can be added external to the module (recommended).
Parameter
STANDARDS COMPLIANCE
UL 60950-1/R:2011-12
CAN/CSA-C22.2 No. 60950-1/A1:2011
EN 60950-1/A2:2013
CE Marked
Notes & Conditions
Reinforced Insulation
2006/95/EC Low Voltage Directive
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.
Product # MCOTS-B-270-31-HT
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 3
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Technical Charts
100
100
95
98
85
96
Efficiency (%)
Efficiency (%)
90
80
75
70
94
Vin = 230 V
Vin = 230 V
92
Vin = 270 V
65
Vin = 270 V
Vin = 400 V
Vin = 400 V
60
0
10
20
30
90
-55 ºC
40
25 ºC
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25 °C.
Figure 2: Efficiency vs. case temperature for minimum, nominal, and maximum
input voltage and 60% rated power.
60
50
50
40
Power Dissipation (W)
Power Dissipation (W)
100 ºC
Case Temperature (ºC)
40
30
20
Vin = 230 V
10
30
20
Vin = 230 V
10
Vin = 270 V
Vin = 270 V
Vin = 400 V
0
0
10
20
30
Vin = 400 V
0
-55 ºC
40
25 ºC
Figure 3: Power dissipation vs. load current for minimum, nominal, and
maximum input voltage at TCASE=25 °C.
Figure 4: Power dissipation vs. case temperature for minimum, nominal, and
maximum input voltage and 60% rated power.
50
Thermal Power Derating
1200
40
1000
Output Voltage (V)
Pout (W)
800
600
400
Vin = 230 V
30
20
Vin = 230 V
10
Vin = 270 V
200
0
100 ºC
Case Temperature (ºC)
Load Current (A)
Vin = 270 V
Vin = 400 V
Vin = 400 V
50
60
70
80
90
100
0
110
Baseplate Temperature (°C)
Figure 5: Maximum output power vs. baseplate temperature for minimum,
nominal, and maximum input voltage.
Product # MCOTS-B-270-31-HT
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0
10
20
30
Load Current (A)
40
50
Figure 6: Output voltage vs. load current, current limit curves for minimum,
nominal, and maximum input voltage at TCASE=25 °C.
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 4
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Technical Charts
50
Vin = 230 V
Vin = 270 V
Output Voltage (V)
40
Vin = 400 V
30
20
10
0
0
10
20
30
40
Load Current (A)
Figure 7: Output voltage vs. load current, regulation curves for minimum,
nominal, and maximum input voltage at TCASE=25 °C.
Figure 8: Turn-on transient at no load and zero output capacitance initiated by
ENA. Input voltage pre-applied. Ch 1: Vout (10 V/div). Ch 2: ENA (5 V/div).
Figure 9: Turn-on transient at half resistive load and 100 uF output capacitance
initiated by ENA. Input voltage pre-applied. Ch 1: Vout (10 V/div). Ch 2: ENA
(5 V/div).
Figure 10: Turn-on transient at half resistive load and 2 mF output capacitance
initiated by ENA. Input voltage pre-applied. Ch 1: Vout (10 V/div). Ch 2: ENA
(5 V/div).
Input
Reflected
Ripple
Current
source
impedance
iS
Input
Terminal
Ripple
Current
iC
Output
Voltage
Ripple
DC-DC
Converter
VOUT
VSOURCE
electrolytic
capacitor
Figure 11: Turn-on transient at half resistive load and 100 uF output capacitance
initiated by Vin. ENA previously enabled. Ch 1: Vout (10 V/div). Ch 2: Vin (200
V/div).
Product # MCOTS-B-270-31-HT
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ceramic electrolytic
capacitor capacitor
Figure 12: Test set-up diagram showing measurement points for Input Terminal
Ripple Current (Figure 16) and Output Voltage Ripple (Figure 17).
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 5
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Technical Charts
Figure 13: Output voltage response to step-change in load current 50%-75%50% of Iout (max). Load capacitance: 1 uF ceramic and 10 uF 100 mΩ ESR
tantalum. Ch1: Vout (2 V/div). Ch 2: Iout (25 A/div).
Figure 14: Output voltage response to step-change in load current 10%-100%10% of Iout (max). Load capacitance: 1 uF ceramic and 10 uF 100 mΩ ESR
tantalum. Ch1: Vout (2 V/div). Ch 2: Iout (25 A/div).
Figure 15: Output voltage response to step-change in input voltage 230 V-400
V-230 V in 250 us. Load capacitance: 10 µF, 100 mΩ ESR tantalum cap and
1 µF ceramic cap. Ch 1: Vin (200 V/div), Ch 2: Vout (20 V/div).
Figure 16: Input terminal ripple, ic, at full load and nominal input voltage
with 10 µH source impedance and 100 µF electrolytic capacitor (100 mA/div).
Bandwidth: 20 MHz. See Figure 12.
Figure 17: Output voltage ripple, Vout, at nominal input voltage and full load
(100 mV/div). Bandwidth: 20 MHz. Load capacitance: 1 uF ceramic and
10 µF 100 mΩ ESR tantalum capacitor. See Figure 12.
Figure 18: Rise of output voltage after the removal of a short circuit across the
output terminals. Rshort = 5 mΩ. Ch1: Vout (10 V/div). Ch 2: Iout (25 A/div).
Bandwidth: 20 MHz.
Product # MCOTS-B-270-31-HT
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Doc.# 005-0006322 Rev. C
02/08/2016
Page 6
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
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 an unregulated
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(-).
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.
5V
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 points 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.
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: 31 V, 28 V, 24 V, 12 V, 9.6 V, or
6 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 BusQor modules act as a true dc transformer. The
output voltage is proportional to the input voltage, with a
specified “turns ratio” or voltage ratio, plus minor drop from
the internal resistive losses in the module. When used in
IBA systems, 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.
82.5K
PIN2
PIN3
ON/OFF
10K
TO ENABLE
CIRCUITRY
IN RTN
Figure B: Internal ON/OFF pin circuitry
SYNCHRONIZATION: The MCOTS converter’s switching
frequency can be synchronized to an external frequency
source that is in the 500 kHz to 600 kHz range. A pulse train
at the desired frequency should be applied to the CLK SYNC
pin (pin 3) with respect to the INPUT RETURN (pin 4). This
pulse train should have a duty cycle in the 20% to 80%
range. Its low value should be below 0.8 V to be guaranteed
to be interpreted as a logic low, and its high value should be
above 2.0 V to be guaranteed to be interpreted as a logic
high. The transition time between the two states should be
less than 300 ns.
If the MCOTS converter is not to be synchronized, the CLK
SYNC pin should be left open circuit. The converter will
then operate in its free-running mode at a frequency of
approximately 550 kHz (twice the switching frequency).
If, due to a fault, the CLK SYNC pin is held in either a
logic low or logic high state continuously, or the CLK SYNC
frequency is outside the 500-600 kHz range, the MCOTS
converter will revert to its free-running frequency.
15.0 V
270 Vdc
230-400 Vdc
Front End
BusQor
Converter
31 Vdc
12.0 V
7.5 V
5.0 V
3.3 V
Typical User Board
Converters
Loads
Figure A: Example of Intermediate Bus Architecture using isolated or nonisolated converters.
Product # MCOTS-B-270-31-HT
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Figure C: Equivalent circuit looking into the CLK SYNC pin with respect to
the IN RTN (input return) pin.
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 7
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
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”. The
lockout circuitry is a comparator with DC hysteresis. When
the input voltage is rising, it must exceed the typical TurnOn 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 F.
Input Over-Voltage Shutdown: The converter also has
a two stage over-voltage feature that limits the converter's
duty cycle for 100 ms before shutdown and a higher second
level with no delay before shutdown if the input voltage
is too high (See the Input Over-Voltage Shutdown section
in the Electrical Characteristics Table for specific voltage
levels). It also has a hysteresis and time delay to ensure
proper operation.
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 1 ms typical (see
Figure D). The shutdown period lasts for a typical period of
250 ms (Figure E) after which the BusQor tries to power up
again (10 ms). If the overload persists, the output voltage
will go through repeated cycles of shutdown and restart
with a duty cycle of 4% (On) and 96% (Off) respectively.
Output
Current
38 A
32.5 A
Output
Voltage
30.5 V
0V
1 ms
Time
Figure D: Output Overload protection diagram (not to scale)
Product # MCOTS-B-270-31-HT
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Output
Current
50 A
peak
Output
Voltage
<31 V
0V
250 ms
10 ms
Time
Figure E: Output Short Circuit and Auto-Resetting protection diagram (not to
scale)
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
50 A will flow into the short circuit for a period not greater
than 1 ms (typically 200 uS). The output of the BusQor will
shutdown to zero for ~ 250 mS (Figure E). At the end of
the shutdown period 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 4% (On) and 96% (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 270 V input is about ~10
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 0.04 A typical. See Figure 18 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.
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 8
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Application Section
APPLICATION CONSIDERATIONS
Start-Up Inhibit Period: Figure F 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 UnderVoltage Lockout is released, and a typical Initial Startup
Inhibit Period of 70 ms is initiated. The output builds up to
90% of the nominal value of 31.0 V in a period of 20 ms
typical (50% load).
At time t2, when the On/Off pin is de-asserted (disabled),
the BusQor output instantly drops to 0 V. Fall time from
31.0 V to 0 V is dependent on output capacitance 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 250 ms typical has elapsed.
Refer to the Control Features section of the data sheet
for details on enabling and disabling methods for Bus Qor
modules.
Thermal Derating Test Setup
The curves showing the derating of output current and
power as a function of the baseplate temperature are
taken with the oven setup shown in Fig. G. The converter
module is soldered to a carrier PCB that is mounted
horizontally within an oven. The carrier PCB is a four layer
4 oz PCB. A large aluminum heatsink (thermal grease is
applied between the baseplate and the heatsink interface
to minimize the thermal impedance) is attached to the
baseplate to keep the baseplate temperature constant
during thermal testing. A small hole is drilled through the
heatsink in order to attach a thermocouple to the baseplate
of the DTU. Additional thermocouples are attached to
the hottest components before base plating to monitor
the internal temperature of all of the critical components
during testing. The oven temperature is controlled so as
to keep the baseplate temperature to the desired value.
The baseplate temperature is kept at 100 oC or below for
all conditions. If the temperature of an internal component
exceeds 125 oC, the output current (power level) is reduced
so as to keep the temperature of all internal components
below 125 oC.
Vin
Heat Sink
UVLO
Thermocouple
DUT
On/Off
Test PCB
(N logic)
OFF
ON
t0
t1
t2
t
t3
Vout
Thermal Chamber
Figure G: Thermal chamber setup for derating curves.
Initial
Start-up
Inhibit
Start-up
Inhibit
Time
Start-Up
Figure F: Power Up/Down Diagram (not to scale) showing Start-Up Inhibit Period
Product # MCOTS-B-270-31-HT
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Doc.# 005-0006322 Rev. C
02/08/2016
Page 9
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Application Section
The current share performance of two paralleled modules is
illustrated in the graph in Figure I. In this graph the percent
deviation from ideal sharing (50%) is plotted for each module
versus the total output load current at 270 Vin. Two MCOTS 270
Bus Qor’s will share within 10% at higher loads. The current share
accuracy is affected by changes in the gate drive timing. The gate
drive timing is adjusted as a function of load to better optimize the
product efficiency over line and load (performance), resulting in
higher load share deviations at lighter loads.
270 Vin
20.0%
Deviation from 50/50 Sharing (%)
Current Sharing: MCOTS BusQor modules are designed to
operate in parallel without the use of any external current share
circuitry. Current sharing is achieved through “Droop Share”. 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 H for details on PCB layout.
Contact SynQor application engineering for further assistance on
PCB trace design.
15.0%
10.0%
5.0%
0.0%
-5.0%
-10.0%
Module 1
-15.0%
Module 2
-20.0%
0
10
20
30
40
50
60
Total Load Current (A)
Figure I: Typical current share performance of 2 paralleled modules
BusQor module
CM EMI
filter
(Not shown
in Figure H)
Bulk
Cap
BusQor module
Input LC filters
Figure H: Recommended physical implementation of two Bus Qor's in parallel.
Product # MCOTS-B-270-31-HT
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 10
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Encased Mechanical Diagram
SEATING PLANE
HEIGHT
0.512±0.005
[13.00±0.12]
2.486 [63.14]
2.000 [50.80]
PIN
EXTENSION
0.163
[4.14]
1.400 [35.56]
5
TOP VIEW
6
0.004 [0.10]
1.900 2.386
[48.26][60.60]
0.01
[0.3]
1.900
[48.26]
4
1
0.30
[7.6]
3
2
1
0.400
0.600 [10.16]
THRU HOLE STANDOFFS
SEE NOTE 1
(4 PLCS)
1.400 [35.56]
NOTES
PIN DESIGNATIONS
1)APPLIED TORQUE PER M3 OR 4-40 SCREW SHOULD NOT EXCEED
6 in-lb (0.7Nm).
NONTHREADED: DIA 0.125" (3.18 mm)
2) BASEPLATE FLATNESS TOLERANCE IS 0.004"
(.10 mm) TIR FOR SURFACE.
3) PINS 1-4 ARE 0.040" (1.02 mm) DIA. WITH 0.080" (2.03 mm)
DIA. STANDOFFS.
4) PINS 5 AND 6 ARE 0.080" (2.03 mm) DIA. WITH 0.125"
(3.18mm) DIA STANDOFFS
5) ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
6) WEIGHT: 4.8 oz (137 g)
7) ALL DIMENSIONS IN INCHES(mm)
TOLERANCES:
X.XX IN +/-0.02 (X.X mm +/-0.5 mm)
Pin
1
2
3
4
5
6
Name
Function
Vin(+) Positive input voltage
TTL input to turn converter on and off,
ON/OFF
referenced to Vin(–), with internal pull up.
Clock
Clock synchronization
Sync
Vin(–) Negative input voltage
Vout(–) Negative output voltage
Vout(+) Positive output voltage
X.XXX IN +/-0.010 (X.XX mm +/-0.25 mm)
Product # MCOTS-B-270-31-HT
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 11
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Flanged Encased Mechanical Diagram
3.150 [80.01]
2.950 [74.93]
PIN
EXTENSION
0.180
[4.57]
SEATING
PLANE HEIGHT
0.495 0.025
[12.57 0.63]
2.486 [63.14]
1.400 [35.56]
6
5
TOP VIEW
0.010 [0.25]
1.300
[33.02]
1.866
[47.40]
1.900
[48.26]
2.386
[60.60]
4
1
0.31
[7.9]
0.775 0.020
[19.69 0.50]
.130 [3.30]
SEE NOTE 1
(6 PLCS)
2
1
FLANGE
THICKNESS
0.125
[3.18]
0.400 [10.16]
0.600 [15.24]
1.400 [35.56]
NOTES
PIN DESIGNATIONS
1) APPLIED TORQUE PER M3 OR 4-40 SCREW SHOULD NOT EXCEED
6 in-lb (0.7Nm).
2) BASEPLATE FLATNESS TOLERANCE IS 0.01" (.25 mm)
TIR FOR SURFACE.
3) PINS 1-4 ARE 0.040" (1.02 mm) DIA. WITH 0.080" (2.03 mm)
DIA. STANDOFFS
4) PINS 5 AND 6 ARE 0.080" (2.03 mm) DIA. WITH 0.125"
(3.18mm) DIA STANDOFFS
5) ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
6) WEIGHT: 5.0 oz (143 g)
7) ALL DIMENSIONS IN INCHES(mm)
TOLERANCES: X.XX IN +/-0.02 (X.X mm +/-0.5 mm)
X.XXX IN +/-0.010 (X.XX mm +/-0.25 mm)
Product # MCOTS-B-270-31-HT
3
Phone 1-888-567-9596
Pin
1
2
3
4
5
6
www.synqor.com
Name
Function
Vin(+) Positive input voltage
TTL input to turn converter on and off,
ON/OFF
referenced to Vin(–), with internal pull up.
Clock
Clock synchronization
Sync
Vin(–) Negative input voltage
Vout(–) Negative output voltage
Vout(+) Positive output voltage
Doc.# 005-0006322 Rev. C
02/08/2016
Page 12
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Qualifications & Screening
Mil-COTS Qualification
Test Name
Life Testing
Shock-Vibration
# Tested Consistent with MIL(# Failed)
STD-883F Method
Details
Visual, mechanical and electrical testing before, during
and after 1000 hour burn-in @ full load
Visual, mechanical and electrical testing before, during
and after shock and vibration tests
Humidity
+85˚C, 95% RH, 1000 hours, 2 minutes on / 6 hours off
Temperature
Cycling
500 cycles of -55˚C to +100˚C
(30 minute dwell at each temperature)
Solderability
15 pins
DMT
-65˚C to +110˚C across full line and load specifications
in 5˚C steps
Altitude
70,000 feet (21 km), see Note
15
(0)
5
(0)
8
(0)
10
(0)
15
(0)
7
(0)
2
(0)
Consistent with MIL-STD883F Method 5005
Method 1005.8
MIL-STD-202,
Methods 201A & 213B
Method 1004.7
Method 1010.8
Condition A
Method 2003
Note: A conductive cooling design is generally needed for high altitude applications because of naturally poor convective cooling at rare atmospheres.
Mil-COTS DC-DC Converter and Filter Screening
Screening
Process Description
S-Grade
M-Grade
Baseplate Operating Temperature
-55˚C to +100˚C
-55˚C to +100˚C
Storage Temperature
-65˚C to +135˚C
-65˚C to +135˚C
●
●
Pre-Cap Inspection
IPC-A-610, Class III
Temperature Cycling
MIL-STD-883F, Method 1010, Condition B, 10 Cycles
Burn-In
100˚C Baseplate
12 Hours
96 Hours
100%
25˚C
-55˚C, +25˚C, +100˚C
MIL-STD-883F, Method 2009
●
●
Final Electrical Test
Final Visual Inspection
MIL-STD-810G Test
Fungus
Method
508.6
●
Mil-COTS MIL-STD-810G Qualification Testing
Description
Table 508.6-I
500.5 - Procedure I
Storage: 70,000 ft / 2 hr duration
500.5 - Procedure II
Operating: 70,000 ft / 2 hr duration; Ambient Temperature
Rapid Decompression
500.5 - Procedure III
Storage: 8,000 ft to 40,000 ft
Acceleration
513.6 - Procedure II
Operating: 15 g
Salt Fog
509.5
Storage
501.5 - Procedure I
Storage: 135°C / 3 hrs
501.5 - Procedure II
Operating: 100°C / 3 hrs
502.5 - Procedure I
Storage: -65°C / 4 hrs
502.5 - Procedure II
Operating: -55°C / 3 hrs
Temperature Shock
503.5 - Procedure I - C
Storage: -65°C to 135°C; 12 cycles
Rain
506.5 - Procedure I
Wind Blown Rain
Immersion
512.5 - Procedure I
Non-Operating
Humidity
507.5 - Procedure II
Aggravated cycle @ 95% RH (Figure 507.5-7 aggravated temp - humidity cycle, 15 cycles)
Random Vibration
514.6 - Procedure I
10 - 2000 Hz, PSD level of 1.5 g2/Hz (54.6 grms), duration = 1 hr/axis
516.6 - Procedure I
20 g peak, 11 ms, Functional Shock (Operating no load) (saw tooth)
516.6 - Procedure VI
514.6 - Category 14
510.5 - Procedure I
Bench Handling Shock
Rotary wing aircraft - helicopter, 4 hrs/axis, 20 g (sine sweep from 10 - 500 Hz)
Blowing Dust
510.5 - Procedure II
Blowing Sand
Altitude
High Temperature
Low Temperature
Shock
Sinusoidal vibration
Sand and Dust
Product # MCOTS-B-270-31-HT
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 13
MCOTS-B-270-31-HT
Input:230-400 V
Output:31 V
Current:32.5 A
Ordering Section
Ordering Information/ Part Numbering
Example: MCOTS-B-270-31-HT
Not all combinations make valid part numbers, please contact SynQor for availability. See product summary page for details.
Family
MCOTS
Product
B: Bus Converter
Input Voltage
270: 230-400V
Output
Voltage
31: 31V
Screening
Level
Package
Thermal Design
HT: Half Brick Tera
N: Normal Threaded
D: Normal
Non-Threaded
F: Flanged
S: S-Grade
M: M-Grade
Options
[ ]: Standard Feature
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 and to order:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # MCOTS-B-270-31-HT
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
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:
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
9,143,042
WARRANTY
SynQor offers a two (2) year limited warranty. Complete warranty information
is listed on our website or is available upon request from SynQor.
www.synqor.com
Doc.# 005-0006322 Rev. C
02/08/2016
Page 14