10A/50W

MCOTS-C-28-05D-DM
Dual Output
Demi-brick
16-40V
Military COTS DC‑DC Converter
Continuous Input
16-50V
±5V
10A
88% @ 5A / 87% @ 10A
Transient Input
Output
Total Output
Efficiency
The Mil-COTS DC-DC Converters bring SynQor’s
field proven high-efficiency synchronous rectification
technology to the Military/Aerospace industry. SynQor’s
ruggedized encased packaging approach ensures
survivability in demanding environments. These
converters operate at a fixed frequency and follow
conservative component derating guidelines. They are
designed and manufactured to comply with a wide range
of military standards.
M-N-S
-28-05D-D
R
E
MCOTS-C
T
l
ONVER
DC-DC C5Vout @ 10A Tota
±
28Vin
Safety Features
Made in USA
• 1000V, 100MΩ input-to-output isolation
• Certified 60950-1 requirement for basic insulation
(see Standards and Qualifications page)
Operational Features
•
•
•
•
•
Mechanical Features
•
•
•
•
Demi-brick Pin-out configuration
Size: 1.55” x 1.52” x 0.50” (39.4 x 38.6 x 12.7 mm)
Total weight: 1.97 oz. (56 g)
Flanged baseplate version available
High efficiency, 87% at full rated load current
Operating input voltage range: 16-40V
Fixed frequency switching to provide predictable EMI
Clock synchronization
No minimum load requirement
Protection Features
Control Features
•
•
•
•
• On/Off control referenced to input return
• Output voltage trim range of +10%, -10%
Input under-voltage lockout
Output current limit and short circuit protection
Active back bias limit
Output over-voltage protection
Screening/Qualification
Compliance Features
MilCOTS series converters (With an MCOTS filter) are designed to meet:
• MIL-HDBK-704-8 (A-F)
• RTCA/DO-160 Section 16
• MIL-STD-1275 (B, D)
• MIL-STD-461 (C, D, E, F)
• DEF-STAN 61-5 (Part 6)/(5 or 6) for VIN > 16V (with MCOTS-F-28-T-HT)
Product # MCOTS-C-28-05D-DM
Phone 1-888-567-9596
•
•
•
•
AS9100 & ISO 9001 certified facility
Qualification consistent with 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 100C baseplate temperature
• Final visual inspection per MIL-STD-2008
• Full component traceability
www.synqor.com
Doc.# 005-0006694 Rev. B
07/02/2015
Page 1
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Block Diagram
REGULATION STAGE
ISOLATION STAGE
CURRENT
SENSE
1
POSITIVE
INPUT
T1
7
T1
T2
POSITIVE
OUTPUT
T2
2
8
INPUT
RETURN
ISOLATION BARRIER
GATE DRIVERS
3
NO CONNECT
UVLO
OVSD
CURRENT
LIMIT
4
ON/OFF
PRIMARY
CONTROL
5
T1
CONTROL POWER
OVP
T2
9
NEGATIVE
OUTPUT
GATE DRIVERS
12
NO CONNECT
MAGNETIC
DATA COUPLING
SYNC OUTPUT
OUTPUT
RETURN
11
SECONDARY
CONTROL
NO CONNECT
10
TRIM
6
SYNC INPUT
POSITIVE
OUTPUT
Typical Connection Diagram
1
2
28Vdc
3
+
4
OPEN
MEANS
ON
Product # MCOTS-C-28-05D-DM
5
6
+VIN
N/C
MCOTS
DEMI
IN RTN
N/C
DC-DC
ON/OFF
SYNC OUT
CONVERTER
SYNC IN
Phone 1-888-567-9596
N/C
TRIM
-VOUT
OUT RTN
+VOUT
www.synqor.com
12
11
RTRIM UP
RTRIM SENSE
RTRIM DOWN
10
9
LOAD
8
7
Doc.# 005-0006694 Rev. B
LOAD
07/02/2015
+
+
Page 2
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Electrical Characteristics
MCOTS-C-28-05D-DM ELECTRICAL CHARACTERISTICS
Tb = 25 °C, Vin = 28 Vdc, +Iout = -Iout = 5A, free running (see Note 8) unless otherwise specified; full operating temperature range is -55 °C to +100
°C baseplate temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min. Typ. Max.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Transient Protection
Isolation Voltage
Input to Output
Input to Base-Plate
Output to Base-Plate
Operating Case Temperature
Storage Case Temperature
Voltage at ON/OFF
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Shutdown
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Shutdown Voltage Hysteresis
Input Over-Voltage Shutdown
Turn-Off Voltage Threshold
Turn-On Voltage Threshold
Shutdown Voltage Hysteresis
Input Filter Component Values (L\C)
Maximum Input Current
No Load Input Current
Disabled Input Current
Input Terminal Current Ripple (pk-pk)
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Positive Ouput
Negative Output
Positive Output Voltage Regulation
Over Line
Over Load
Over Temperature
Output Voltage Cross Regulation
Total Positive Output Voltage Range
Output Voltage Ripple and Noise Peak to Peak
Operating Output Current Range
Single Output Operating Current Range
Operating Output Power Range
Output DC Current-Limit Inception
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
Output Voltage Deviation Load Transient
For a Pos. Step Change in Load Current
Settling Time
Response to Input Transient
Output Voltage Trim Range
Output Over-Voltage Shutdown
Product # MCOTS-C-28-05D-DM
Phone 1-888-567-9596
-1
-55
-65
-1.2
Units
60
40
60
V
V
V
1000
1000
1000
100
135
50
V
V
V
°C
°C
V
16
28
40
V
14.75
14.00
15.5
14.75
0.8
16
15.50
V
V
V
Notes & Conditions
Continuous
Continuous
See Note 1
Baseplate temperature
See Note 3
See Note 3
52
50.5
55
58
54.0
56.5
2
1.0\11.47
3.9
75
125
10
15
40
75
4.95
-5.05
5.00
-5.00
5.05
-4.95
-0.4
-0.4
-100
0
0
0
250
5.00
15
0.4
0.4
100
4.90
0
0
0
10.5
12
3
10
V
V
V
µH\µF
A
mA
mA
mA
5000
V
V
mV
%
%
mV
mV
V
mV
A
A
W
A
A
mA
µF
10
7.1
mV
µs
mV
%
V
5.10
75
10
8
50
13.8
Internal values; see Figure F
Vin = 16V; +Iout = -Iout = 5A
Bandwidth = 100kHz – 10MHz; see Figure 14
+Vout @(+Iout=-Iout=0A) - +Vout @(+Iout=-Iout=5A)
-Vout @(+Iout=-Iout=2A) - -Vout @(+Iout=8A, -Iout=2A)
Over sample, line, load, temperature & life
Bandwidth = 10MHz; CL=11µF
(+Iout) + (-Iout)
Maximum +Iout or -Iout
Total on both outputs
See Note 4; +Iout + -Iout; +Iout = -Iout
See Note 5
-400
200
150
-10
5.6
6.1
www.synqor.com
Total Iout step = 5A to 10A, 1A to 5A; CL=11µF on both Vouts
See Note 6
See Figure E
Doc.# 005-0006694 Rev. B
07/02/2015
Page 3
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Electrical Characteristics
MCOTS-C-28-05D-DM ELECTRICAL CHARACTERISTICS (Continued)
Tb = 25 °C, Vin = 28 Vdc, +Iout = -Iout = 5A, free running (see Note 8) unless otherwise specified; full operating temperature range is -55 °C to +100
°C baseplate temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min. Typ. Max.
Units
Notes & Conditions
EFFICIENCY
Iout = 10 A (28 Vin)
87
%
Iout = 5 A (28 Vin)
88
%
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
See Absolute Maximum Ratings
Isolation Resistance
100
MΩ
Isolation Capacitance (input to output)
22
nF
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
Maximum Baseplate Temperature, Tb
100
°C
FEATURE CHARACTERISTICS
Switching Frequency (free running)
550
kHz
Synchronization Input
Frequency Range
500
700
kHz
Logic Level High
2.0
5.5
V
Logic Level Low
-0.5
0.8
V
Duty Cycle
20
80
%
Synchronization Output
Pull Down Current
20
mA
VSYNC OUT = 0.8V
Duty Cycle
40
60
%
Output connected to SYNC IN of other units
ON/OFF Control
Off-State Voltage
0.8
V
Module Off Pulldown Current
80
µA
Current drain required to ensure module is off
On-State Voltage
2
V
Module On Pin Leakage Current
20
µA
Imax draw from pin allowed with module still on
Pull-Up Voltage
3.2
4
4.8
V
See Figure A
DYNAMIC CHARACTERISTICS
Turn-On Transient
Output Voltage Rise Time
6
10
ms
+Vout = 0.5V to 4.5V; Full Resistive Load
Output Voltage Overshoot
0
2
%
Resistive load
Turn-On Delay, Rising Vin
5.5
8.0
ms
On/Off = 5V; see Notes 7 & 2
Turn-On Delay, Rising ON/OFF
3
6
ms
See Note 2, see Note 9
Restart Inhibit Time
100
150
ms
See Note 2, see Note 9
Short Circuit Start Time
12
14
20
ms
RELIABILITY CHARACTERISTICS
Calculated MTBF per MIL-HDBK-217F
3.9
106 Hrs.
Ground Benign, 70ºC Tb
Calculated MTBF per MIL-HDBK-217F
0.79
106 Hrs.
Ground Mobile, 70ºC Tb
Electrical Characteristics Notes
1. Converter will undergo input over-voltage shutdown.
2. After a disable or fault event, module is inhibited from restarting for 100ms. See Shut Down section of the Control Features description.
3. High or low state of input voltage must persist for about 200µs to be acted on by the shutdown circuitry.
4. Current limit inception is defined as the point where the output voltage has dropped to 90% of its nominal value.
See Current Limit discussion in Features Description section.
5. Load current transition time ≥ 10µs.
6. Line voltage transition time ≥ 100µs.
7. Input voltage rise time ≤ 250µs.
8. Operating the converter at a synchronization frequency above the free running frequency will cause the converter’s efficiency to be slightly reduced
and it may also cause a slight reduction in the maximum output current/power available.
9. Time measured at 10% of the rising output voltage.
Product # MCOTS-C-28-05D-DM
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Doc.# 005-0006694 Rev. B
07/02/2015
Page 4
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Technical Charts
95
95
90
90
Efficiency (%)
100
Efficiency (%)
100
85
80
75
16 Vin
70
28 Vin
65
4
6
Load Current (A)
8
Power Dissipation (W)
Power dissipation (W)
8
7
6
5
4
16 Vin
28 Vin
40 Vin
2
4
6
Load Current (A)
8
7
6
5
4
3
16 Vin
2
28 Vin
1
40 Vin
-55 -45 -35 -25 -15 -5
10
Figure 3: Power dissipation vs. output power, from zero load to full
load with equal load on the +5V and -5V outputs at minimum, nominal,
and maximum input voltage at 25°C.
100
Output Voltage (%)
10
6
4
15 25 35 45 55 65 75 85 95
Figure 4: Power Dissipation at 60% load (5A load on +5V and 5A
load on -5V) versus base plate temperature for minimum, nominal, and
maximum input voltage.
120
8
5
Case Temperature ( ˚C)
12
2
0
15 25 35 45 55 65 75 85 95
0
0
0
5
Figure 2: Efficiency at 60% load (5A load on +5V and 5A load on -5V)
versus base plate temperature for minimum, nominal, and maximum
input voltage.
8
1
40 Vin
Case Temperature ( ˚C)
9
2
28 Vin
-55 -45 -35 -25 -15 -5
9
3
16 Vin
70
10
Figure 1: Efficiency vs. output power, from zero load to full load with
equal load on the +5V and -5V outputs at minimum, nominal, and
maximum input voltage at 25°C.
Iout (A)
75
60
60
2
80
65
40 Vin
0
85
80
60
40
20
28vin
0
50
60
70
80
90
100
0
110
Figure 5: Maximum total output current vs. base plate temperature
(nominal input voltage.)
Product # MCOTS-C-28-05D-DM
Phone 1-888-567-9596
25
50
75
100
125
150
Load current (%)
Base Plate Temperature (°C)
Figure 6: Output voltage vs. total load current showing typical current
limit curves, evenly split. See Current limit section in application notes.
www.synqor.com
Doc.# 005-0006694 Rev. B
07/02/2015
Page 5
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Technical Charts
Figure 7: Turn-on transient at no load and zero output capacitance
initiated by On/Off. Input voltage pre-applied. Ch 2: On/Off (5V/div)
Ch 3: -Vout (2V/div.) Ch 4: +Vout (2V/div.).
Figure 8: Turn-on transient at full load and zero output capacitance
initiated by On/Off. Input voltage pre-applied. Ch 2: On/Off (5V/div)
Ch 3: -Vout (2V/div.) Ch 4: +Vout (2V/div.).
Figure 9: Input terminal current ripple, at full rated output current and
Figure 10: Output voltage ripple, Vout, at nominal input voltage and
full rated load current. Ch 4: +Vout (2mV/div.)
Figure 11: Output voltage response to step-change in load current 50%-100%50% of Iout (max).No external load capacitance. Ch 1: +Vout (200mV/div.) Ch
2: +Iout (5A/div.) Ch 3: -Vout (200mV/div.) Ch 4: -Iout (5A/div.)
Figure 12: Output voltage response to step-change in input voltage
(16V - 50V - 16V.). Ch 1: Vin (20V/div.) Ch 2: -Vout (50mV/div); Ch 3:
+Vout (50mV/div).
nominal input voltage with SynQor MCOTS filter. Ch 1: Module Iin (10mA/div.)
See Figure 20.
Product # MCOTS-C-28-05D-DM
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Doc.# 005-0006694 Rev. B
07/02/2015
Page 6
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Technical Charts
1
Output Impedance (ohms)
Output Impedance (ohms)
1
0.1
16V
0.01
28V
40V
0.001
100
1,000
Hz
10,000
28V
40V
100,000
Figure 13:Magnitude of incremental output impedance (-Zout =
+vout/+iout) for minimum, nominal, and maximum input voltage at full
rated power.
10
0
0
-10
-10
-20
-20
-30
-40
-50
-60
-70
-80
16V
10,000
Figure 15: Magnitude of incremental forward transmission (+FT =
+vout/+vin) for minimum, nominal, and maximum input voltage at full
rated power.
-60
-70
-80
0
Reverse Transmission (dB)
0
-20
16V
28V
40V
-40
16V
28V
-50
40V
10,000
100,000
Hz
Figure 16: Magnitude of incremental forward transmission (-FT =
-vout/-vin) for minimum, nominal, and maximum input voltage at full
rated power.
10
-10
100,000
-50
10
-30
10,000
-40
-100
1,000
100,000
Hz
Hz
-90
40V
-100
1,000
1,000
-30
28V
-90
100
Figure 14:Magnitude of incremental output impedance (-Zout = -vout/iout) for minimum, nominal, and maximum input voltage at full rated
power.
Forward Transmission (dB)
Forward Transmission (dB)
16V
0.01
0.001
10
Reverse Transmission (dB)
0.1
-10
-20
16V
-30
28V
40V
-40
-50
10
100
1,000
Hz
10,000
100,000
Figure 17: Magnitude of incremental reverse transmission (+RT =
+iin/+iout) for minimum, nominal, and maximum input voltage at full
rated power.
Product # MCOTS-C-28-05D-DM
Phone 1-888-567-9596
10
100
1,000
Hz
10,000
100,000
Figure 18: Magnitude of incremental reverse transmission (-RT = -iin/iout) for minimum, nominal, and maximum input voltage at full rated
power.
www.synqor.com
Doc.# 005-0006694 Rev. B
07/02/2015
Page 7
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Technical Charts
Input Impedance (ohms)
100
10
1
16V
28V
40V
0.1
10
100
1,000
10,000
Hz
100,000
Figure 20:Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 9) and Output Voltage Ripple (Figure
10).
Figure 21: A short circuit across +Vout terminals. Ch 1: +Iout (5A/div)
Ch 4: +Vout (50mV/div).
Figure 22: SYNC OUT vs. time, driving Sync IN of a second SynQor
converter
-5.5
5.4
-5.4
5.4
-5.4
5.3
-5.3
5.3
-5.3
5.2
-5.2
5.2
-5.2
5.1
-5.1
5.1
-5.1
5.0
-5.0
5.0
-5.0
4.9
-4.9
4.9
-4.9
4.8
-4.8
4.8
-4.8
4.7
-4.7
4.7
-4.6
4.6
+Vout
Positive Output (V)
4.6
4.5
8.0/2.0
-Vout
7.0/3.0
6.0/4.0
5.0/5.0
4.0/6.0
3.0/7.0
Positive Output (V)
5.5
Negative Output (V)
-5.5
5.5
Figure 23: Load regulation vs. load current with power fixed at full
load (50W) and load currents split as shown between the +5V and -5V
outputs, at nominal input voltage and at 25°C.
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-4.6
-Vout
7.0/1.0 6.0/2.0 5.0/3.0 4.0/4.0 3.0/5.0 2.0/6.0 1.0/7.0
-4.5
0/8.0
+IOUT (A) / -IOUT (A)
+IOUT (A) / -IOUT (A)
Product # MCOTS-C-28-05D-DM
-4.7
+Vout
4.5
8.0/0
-4.5
2.0/8.0
Negative Output (V)
Figure 19: Magnitude of incremental input impedance (Zin = vin/iin) for
minimum, nominal, and maximum input voltage at full rated power.
Figure 24: Load regulation vs. load current with power fixed at 80%
load (40W) and load currents split as shown between the +5V and -5V
outputs, at nominal input voltage and at 25°C.
www.synqor.com
Doc.# 005-0006694 Rev. B
07/02/2015
Page 8
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Application Section
BASIC OPERATION AND FEATURES
The MCOTS DC-DC converter uses a two-stage power conversion
topology. The first, or regulation, stage is a buck-converter that
keeps the output voltage constant over variations in line, load, and
temperature. The second, or isolation, stage uses transformers
to provide the functions of input/output isolation and voltage
transformation to achieve the output voltage required.
In the dual output converter there are two secondary windings in
the transformer of the isolation stage, one for each output. There
is only one regulation stage, however, and it is used to control the
positive output. The negative output therefore displays “CrossRegulation”, meaning that its output voltage depends on how much
current is drawn from each output.
Both the positive and the negative outputs share a common OUTPUT
RETURN pin.
Both the regulation and the isolation stages switch at a fixed
frequency for predictable EMI performance. The isolation stage
switches at one half the frequency of the regulation stage, but due
to the push-pull nature of this stage it creates a ripple at double its
switching frequency. As a result, both the input and the output of
the converter have a fundamental ripple frequency of about 550 kHz
in the free-running mode.
Rectification of the isolation stage’s output is accomplished with
synchronous rectifiers. These devices, which are MOSFETs with a
very low resistance, dissipate far less energy than would Schottky
diodes. This is the primary reason why the MCOTS converters have
such high efficiency, particularly at low output voltages.
Besides improving efficiency, the synchronous rectifiers permit
operation down to zero load current. There is no longer a need
for a minimum load, as is typical for converters that use diodes for
rectification. The synchronous rectifiers actually permit a negative
load current to flow back into the converter’s output terminals if
the load is a source of short or long term energy. The MCOTS
converters employ a “back-drive current limit” to keep this negative
output terminal current small.
There is a control circuit in the MCOTS converter that determines
the conduction state of the power switches. It communicates
across the isolation barrier through a magnetically coupled device.
No opto-isolators are used.
An input under-voltage shutdown feature with hysteresis is provided,
as well as an input over-voltage shutdown and an output overvoltage limit. There is also an output current limit that is nearly
constant as the load impedance decreases (i.e., there is not foldback or fold-forward characteristic to the output current under this
condition). When a load fault is removed, the output voltage rises
exponentially to its nominal value without an overshoot. If a load
fault pulls the output voltage below about 60% of nominal, the
converter will shut down to attempt to clear the load fault. After a
short delay it will try to auto‑restart.
The MCOTS converter’s control circuit does not implement an overtemperature shutdown.
Product # MCOTS-C-28-05D-DM
Phone 1-888-567-9596
The following sections describe the use and operation of additional
control features provided by the MCOTS converter.
5V
82.5K
PIN4
PIN2
ON/OFF
10K
TO ENABLE
CIRCUITRY
IN RTN
Figure A: Circuit diagram shown for reference only, actual circuit
components may differ from values shown for equivalent circuit.
CONTROL FEATURES
Remote ON/OFF: The MCOTS converter has one on/off function
pin, ON/OFF (pin 4), which is referenced with respect to the
converter’s input return (pin 2). It must have a logic high level for
the converter to be enabled; a logic low inhibits the converter.
The ON/OFF pin is internally pulled high so that an open connection
will enable the converter. Figure A shows the equivalent circuit
looking into the ON/OFF pin. It is TTL compatible and has hysteresis.
SHUT DOWN: The MCOTS converter will shut down in response
to only five conditions: ON/OFF input low, VIN input below
under-voltage shutdown threshold, VIN input above over-voltage
shutdown threshold, output voltage below the output undervoltage threshold, and output voltage above the output overvoltage threshold. Following any shutdown event, there is a startup
inhibit delay which will prevent the converter from restarting for
approximately 100ms. After the 100ms delay elapses, if the ON/
OFF inputs are high and the input voltage is within the operating
range, the converter will restart. If the VIN input is brought down
to nearly 0V and back into the operating range, there is no startup
inhibit, and the output voltage will rise according to the “Turn-On
Delay, Rising Vin” specification.
SYNCHRONIZATION: The MCOTS converter’s switching
frequency can be synchronized to an external frequency source that
is in the 500 kHz to 700 kHz range. A pulse train at the desired
frequency should be applied to the SYNC IN pin (pin 6) with respect
to the INPUT RETURN (pin 2). This pulse train should have a duty
cycle in the 20% to 80% range. Its low value should be below 0.8V
to be guaranteed to be interpreted as a logic low, and its high value
should be above 2.0V to be guaranteed to be interpreted as a logic
high. The transition time between the two states should be less
www.synqor.com
Doc.# 005-0006694 Rev. B
07/02/2015
Page 9
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Application Section
than 300ns.
5V
If the MCOTS converter is not to be synchronized, the SYNC IN pin
should be left open circuit. The converter will then operate in its
free-running mode at a frequency of approximately 550 kHz.
If, due to a fault, the SYNC IN pin is held in either a logic low or
logic high state continuously, or the SYNC IN frequency is outside
the 500-700 kHz range, the MCOTS converter will revert to its freerunning frequency.
The MCOTS converter also has a SYNC OUT pin (pin 5). This output
can be used to drive the SYNC IN pins of as many as ten (10) other
MCOTS converters. The pulse train coming out of SYNC OUT has
a duty cycle of 50% and a frequency that matches the switching
frequency of the converter with which it is associated. This
frequency is either the free‑running frequency if there is no valid
synchronization signal at the SYNC IN pin, or the synchronization
frequency if there is.
Figure B shows the equivalent circuit looking into the SYNC IN pin
and Figure C shows the equivalent circuit looking into the SYNC
OUT pin.
5K
IN RTN
OPEN COLLECTOR
OUTPUT
15100Ω*Vout - 6000Ω*Vnom
- 30000Ω
Vnom - Vout
To trim the output voltage above its nominal value, connect an
external resistor from the TRIM pin to the OURPUT RETURN pin
as shown in Figure D. The value of this trim up resistor should be
chosen according to the following equation or from Figure E:
Vout = the desired output voltage (greater than Vnom),
and
Rtrim up is in Ohms.
Rtrim down(Ω) =
where:
Vnom = the converter’s nominal output voltage,
where:
Vnom = the converter’s nominal output voltage,
As the output voltage is trimmed up, it produces a greater voltage
stress on the converter’s internal components and may cause the
converter to fail to deliver the desired output voltage at the low
5V
PIN 2
end of the input voltage range at the higher end of the load current
and temperature range. Please consult the factory for details.
To trim the output voltage below its nominal value, connect an
external resistor between the TRIM pin and the POSITIVE OUTPUT
pin as shown in Figure D. The value of this trim down resistor
should be chosen according to the following equation or from Figure
E:
6000Ω*Vnom
Rtrim up(Ω) =
- 30000Ω
Vout - Vnom
PIN 5
Figure C: Equivalent circuit looking into SYNC OUT pin with respect to the IN
RTN (input return) pin.
OUTPUT VOLTAGE TRIM: The TRIM pin (pin 11) can adjust the
MCOTS converter’s output voltage ±10% around its nominal value.
SYNC OUT
FROM SYNC
CIRCUITRY
Vout = the desired output voltage (less than Vnom),
and
Rtrim down is in Ohms.
INPUT UNDER-VOLTAGE SHUTDOWN: The MCOTS converter
has an under-voltage shutdown feature that ensures the converter
will be off if the input voltage is too low. The input voltage turnon threshold is higher than the turn-off threshold. In addition, the
MCOTS converter will not respond to a state of the input voltage
unless it has remained in that state for more than about 200µs. This
hysteresis and the delay ensure proper operation when the source
impedance is high or in a noisy environment.
INPUT OVER-VOLTAGE SHUTDOWN: The MCOTS converter
also has an over-voltage feature that ensures the converter will be
off if the input voltage is too high. It also has a hysteresis and time
delay to ensure proper operation.
5K
PIN 6
PIN 2
SYNC IN
5K
IN RTN
Figure B: Equivalent circuit looking into the SYNC IN pin with
respect to the IN RTN (input return) pin.
Product # MCOTS-C-28-05D-DM
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TO SYNC
CIRCUITRY
OUTPUT OVER-VOLTAGE SHUTDOWN: The MCOTS converter
will shut down if the voltage at its power output pins ever exceeds
about 130% of the nominal value. The shutdown threshold does not
change with output trim or sense drops; excessive trim-up or output
wiring drops may cause an output over-voltage shutdown event.
After a startup inhibit delay, the converter will attempt to restart.
OUTPUT UNDER-VOLTAGE SHUTDOWN: The MCOTS converter
will also shut down if the voltage at its power output pins ever dips
below 60% of the nominal value for more than a few milliseconds.
www.synqor.com
Doc.# 005-0006694 Rev. B
07/02/2015
Page 10
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Application Section
1
+VIN
2
28Vdc
N/C
4
OPEN
MEANS
ON
MCOTS
DEMI
IN RTN
3
+
N/C
DC-DC
ON/OFF
5
SYNC OUT
6
CONVERTER
SYNC IN
N/C
TRIM
-VOUT
OUT RTN
+VOUT
12
11
RTRIM UP
RTRIM SENSE
RTRIM DOWN
10
9
LOAD
8
7
LOAD
+
+
Figure D: Typical connection for output voltage trimming.
Output voltage reduction due to output current overload (current
limit) is the most common trigger for this shutdown. The shutdown
threshold does not change with output trim but at only 10%, trimdown should not trigger this event. After a startup inhibit delay,
the converter will attempt to restart. This shutdown is disabled
during startup.
BACK-DRIVE CURRENT LIMIT: Converters that use MOSFETs
as synchronous rectifiers are capable of drawing a negative current
from the load if the load is a source of short- or long-term energy.
This negative current is referred to as a “back-drive current”.
Conditions where back-drive current might occur include paralleled
converters that do not employ current sharing. It can also occur
when converters having different output voltages are connected
together through either explicit or parasitic diodes that, while
normally off, become conductive during startup or shutdown.
Finally, some loads, such as motors, can return energy to their
power rail. Even a load capacitor is a source of back-drive energy
for some period of time during a shutdown transient.
External Trim Resistance (kOhms)
10000
CURRENT LIMIT: In the event of excess load, the MCOTS converter
will quickly reduce its output voltage to keep the load current within
safe limits (see Figure 6). If the overload persists for more than 14
milliseconds, the converter will shut off, wait a restart delay, and
then automatically attempt to re-start. The timeout is internally
implemented with an integrator: counting up whenever current limit
is active, and counting down at 1/5th the rate whenever current limit
becomes inactive. In this way a series of short-duration overloads
will not cause the converter to shut down, while it will shut down in
response to sustained overloads.
INPUT SYSTEM INSTABILITY: This condition can occur because
any dc-dc converter appears incrementally as a negative resistance
load. A detailed application note titled “Input System Instability” is
available on the SynQor website which provides an understanding
of why this instability arises, and shows the preferred solution for
correcting it.
Trim Up
Trim Down
1000
THERMAL CONSIDERATIONS: The maximum operating
baseplate temperature, TB, is 100ºC. Refer to the thermal derating
curve, Figure 5, to see the available output current at baseplate
temperatures below 100ºC.
100
10
-10%
To avoid any problems that might arise due to back-drive current,
the MCOTS converters limit the negative current that the converter
can draw from its output terminals. The threshold for this backdrive current limit is placed sufficiently below zero so that the
converter may operate properly down to zero load, but its absolute
value (see the Electrical Characteristics page) is small compared to
the converter’s rated output current.
-8%
-6%
-4%
-2%
0%
2%
4%
6%
8%
Output Voltage Adjustment
10%
A power derating curve can be calculated for any heatsink that is
attached to the base-plate of the converter. It is only necessary to
determine the thermal resistance, RTHBA, of the chosen heatsink
Figure E: Trim up and Trim down as a function of external trim resistance.
Product # MCOTS-C-28-05D-DM
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Doc.# 005-0006694 Rev. B
07/02/2015
Page 11
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Application Section
between the base-plate and the ambient air for a given airflow rate.
This information is usually available from the heatsink vendor. The
following formula can then be used to determine the maximum
power the converter can dissipate for a given thermal condition:
TB - TA
=
Pmax
diss
RTH
INPUT FILTERING AND EXTERNAL CAPACITANCE: Figure F
provides a diagram showing the internal input filter components.
This filter dramatically reduces input terminal ripple current, which
otherwise could exceed the rating of the converter’s external
electrolytic input capacitor. More detailed information is available
in the application note titled “EMI Characteristics” on the SynQor
website.
BA
This value of power dissipation can then be used in conjunction
with the data shown in Figure 3 to determine the maximum load
current (and power) that the converter can deliver in the given
thermal condition.
L
Vin(+)
Vout(+)
Internal
Input
Filter
C
Converter
Vin(_)
Vout(-)
Figure F: Internal Input Filter Diagram.
Product # MCOTS-C-28-05D-DM
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Page 12
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Encased Mechanical Diagram
OVERALL HEIGHT
0.500 0.025
[ 12.70 0.63]
1.520 [38.61]
1.120 [28.45]
PIN EXTENSION
0.180
[4.57]
THREADED INSERT
SEE NOTE 1
(4 PLCS)
12
11
10
9
8
7
1
2
3
4
5
6
0.004 [0.10]
TOP VIEW
1.250
[31.75]
1.550 1.150
[39.37] [29.21]
1
0.06
[1.5]
0.05
[1.3]
0.200
0.400
0.600
0.800
1.000
NOTES:
1: APPLIED TORQUE PER M3 SCREW
4in-lb RECOMMENDED (5in-lb LIMIT)
SCREW SHOULD NOT EXCEED 0.100” (2.54mm)
DEPTH BELOW THE SURFACE OF THE BASEPLATE.
2: BASEPLATE FLATNESS TOLERANCE IS
0.004” (.10mm) TIR FOR SURFACE.
3: PINS 1-12 ARE .040” (1.02mm) DIA, WITH 0.080”
(2.03mm) DIA. STANDOFF
4: ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
5: WEIGHT: 1.97 oz. (56g)
6: ALL DIMENSIONS IN INCHES(mm)
TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
Product # MCOTS-C-28-05D-DM
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Pin #
1
2
3
4
5
6
7
8
9
10
11
12
[5.08]
[10.16]
[15.24]
[20.32]
[25.40]
PIN DESIGNATIONS
Function
Positive input
Input return
No connection
On/Off
Sync output
Sync input
Positive output
Output return
Negative output
Trim
No connection
No connection
Pin Designation Notes:
1: Pin out differs from other
Mil-COTS products.
Doc.# 005-0006694 Rev. B
07/02/2015
Page 13
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Flanged Encased Mechanical Diagram
2.000 [50.80]
1.800 [45.72]
OVERALL HEIGHT
0.500 0.025
[ 12.70 0.63]
1.520 [38.61]
TOP VIEW
PIN EXTENSION
0.180
[4.57]
12
.130 [3.30]
SEE NOTE 1
(4 PLCS)
0.010 [0.25]
1.550 1.030 0.650
[39.37] [26.16] [16.51]
11
10
9
8
7
3
4
5
6
BOTTOM VIEW
1.250
[31.75]
1
1
0.30
[7.6]
0.40
[10.2]
NOTES:
1: APPLIED TORQUE PER M3 OR 4-40 SCREW
4in-lb RECOMMENDED (5in-lb LIMIT)
2: BASEPLATE FLATNESS TOLERANCE IS
0.010” (.25mm) TIR FOR SURFACE.
3: PINS 1-12 ARE .040” (1.02mm) DIA, WITH 0.080”
(2.03mm) DIA. STANDOFF
4: ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
5: WEIGHT: 2.08 oz. (59g)
ALL DIMENSIONS IN INCHES(mm)
6: TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
FLANGE THICKNESS
0.125
[3.18]
0.200
0.400
0.600
0.800
1.000
2
[5.08]
[10.16]
[15.24]
[20.32]
[25.40]
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
PIN DESIGNATIONS
Function
Positive input
Input return
No connection
On/Off
Sync output
Sync input
Positive output
Output return
Negative output
Trim
No connection
No connection
Pin Designation Notes:
1: Pin out differs from other
Mil-COTS products.
Product # MCOTS-C-28-05D-DM
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Doc.# 005-0006694 Rev. B
07/02/2015
Page 14
MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Qualifications & Screening
Mil-COTS Qualification
Life Testing
Visual, mechanical and electrical testing before,
during and after 1000 hour burn-in @ full load
# Tested
(# Failed)
15
(0)
ShockVibration
Visual, mechanical and electrical testing before,
during and after shock and vibration tests
5
(0)
Temperature
Cycling
+85˚C, 95% RH, 1000 hours, 2 minutes on / 6
hours off
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
8
(0)
10
(0)
15
(0)
7
(0)
2
(0)
Test Name
Details
Humidity
Consistent with MILSTD-883F Method
Consistent with MIL-STD-883F
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
-55˚C to +100˚C
-55˚C to +100˚C
-65˚C to +135˚C
-65˚C to +135˚C
●
●
100˚C Baseplate
12 Hours
96 Hours
100%
25˚C
-55˚C, +25˚C, +100˚C
MIL-STD-2008
●
●
Baseplate Operating Temperature
Storage Temperature
Pre-Cap Inspection
IPC-610, Class III
Temperature Cycling
Method 1010, Condition B, 10 Cycles
Burn-In
Final Electrical Test
Final Visual Inspection
MIL-STD-810G Test
Fungus
Altitude
Method
508.6
●
Mil-COTS MIL-STD-810G Qualification Testing
Description
Table 508.6-I
500.5 - Procedure I
Storage: 70,000ft. / 2 Hr. duration
500.5 - Procedure II
Operating; 70,000ft. / 2 Hr. duration; Ambient Temperature
Rapid Decompression
500.5 - Procedure III
Storage: 8,000ft. to 40,000ft.
Acceleration
513.6 - Procedure II
Operating - 15g’s
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: -65C / 4 hrs
502.5 - Procedure II
Operating: -55C / 3 hrs
Temperature Shock
503.5 - Procedure I - C
Storage: -65C to 135C; 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(54.6grms), duration = 1 hr/axis
516.6 - Procedure I
20g’s peak, 11ms, 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, 4hrs/axis, 20g’s (sine sweep from 10 - 500HZ)
Blowing Dust
510.5 - Procedure II
Blowing Sand
High Temperature
Low Temperature
Shock
Sinusoidal vibration
Sand and Dust
Product # MCOTS-C-28-05D-DM
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MCOTS-C-28-05D-DM
Input:16-40V
Output:±5V
Current:10A Total
Ordering Information
Part Numbering Scheme
Family
Product
Input
Voltage
Output Voltage
Heatsink Option
Screening
Level
N: Normal Threaded
F: Flanged
S: S-Grade
M: M-Grade
Package Size
Options
3R3S: 3.3V Single
05S: 5.0V Single
12S: 12V Single
MCOTS
C: Converter
28: 16-40V
15S: 15V Single
DM: Demi Mega
28S: 28V Single
[ ]: Standard Feature
05D: 5.0V Dual
12D: 12V Dual
15D: 15V Dual
Application Notes
Ordering Information / Part Numbering
Example: MCOTS-C-28-05D-DM-N-S
Not all combinations make valid part numbers, please contact
SynQor for availability.
STANDARDS COMPLIANCE
Parameter
A variety of application notes and technical white papers can be downloaded
in pdf format from our website.
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1/R:2011-12
Basic Insulation
CAN/CSA-C22.2 No. 60950-1/A1:2011
EN 60950-1/A2:2013
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.
PATENTS
Contact SynQor for further information and to order:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Product # MCOTS-C-28-05D-DM
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 two (2) year limited warranty. Complete warranty information
is listed on our website or is available upon request from SynQor.
www.synqor.com
Doc.# 005-0006694 Rev. B
07/02/2015
Page 16
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