7.5A/180W

MCOTS-C-28V-24-HP
Single Output
Half-brick
MILITARY COTS DC-DC CONVERTER
9-40V
Continuous Input
50V
Transient Input
24V
Output
7.5A
Output
89% @ 3.75A / 88% @ 7.5A
Efficiency
Operation: -55°C to +100°C
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Mil-COTS
The MilQor series of Mil-COTS DC-DC converters brings
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. Compatible with
MCOT
S
DC-D -C-28V-2
4C CON
28V
VERT HP-N-M
ER
IN 24V
OUT @ 7
.5A
the industry standard format, 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.
Safety Features
• 2250V, 30 MΩ input-to-output isolation
• Certified 60950-1 requirement for basic insulation
(see Standards and Qualifications page)
Mechanical Features
• Industry standard half-brick pin-out configuration
• Size:
2.49” x 2.39” x 0.51”
(63.1 x 60.6 x 13.0 mm)
• Total weight: 4.7 oz. (134 g)
• Flanged baseplate version available
Protection Features
•
•
•
•
•
Input under-voltage lockout
Output current limit and short circuit protection
Active back bias limit
Output over-voltage protection
Thermal shutdown
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-C-28V-24-HP
Phone 1-888-567-9596
Designed and Manufactured in the USA
Operational Features
•
•
•
•
High efficiency, 88% at full rated load current
Operating input voltage range: 9-40V
Fixed frequency switching provides predictable EMI
No minimum load requirement
Control Features
•
•
•
•
On/Off control referenced to input return
Remote sense for the output voltage
Output voltage trim range of +10%, -20%
Optional: Active current share for parallel applications
Screening/Qualification
•
•
•
•
AS9100 and ISO 9001:2008 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 100C baseplate temperature
• Final visual inspection per MIL-STD-2008
• Full component traceability
www.synqor.com
Doc.# 005-0005764
Rev. 2
07/29/14
Page 1
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Technical Diagrams
BLOCK DIAGRAM
REGULATION STAGE
ISOLATION STAGE
CURRENT
SENSE
1
POSITIVE
OUTPUT
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POSITIVE
INPUT
8
T1
T2
T1
T2
3
4
ISOLATION BARRIER
INPUT
RETURN
GATE DRIVERS
CURRENT
LIMIT
UVLO
OVSD
2
ON/OFF
OPTO-ISOLATION
PRIMARY
CONTROL
OUTPUT
RETURN
GATE CONTROL
6
TRIM
SECONDARY
CONTROL
7
+ SENSE
5
− SENSE
DATA COUPLING
TYPICAL CONNECTION DIAGRAM
Vin(+)
Vin
External
Input
Filter
Electrolytic
Capacitor
Vout(+)
Vsense(+)
ON/OFF
Trim
Vsense(_)
Vin(_)
Product # MCOTS-C-28V-24-HP
Phone 1-888-567-9596
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Rtrim-up
or
Rtrim-down
Cload
Iload
Vout(_)
Doc.# 005-0005764
Rev. 2
07/29/14
Page 2
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Technical Specification
MCOTS-C-28V-24-HP ELECTRICAL CHARACTERISTICS
Ta = 25 °C, Vin = 28dc 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.
Typ.
Max.
Units
Notes & Conditions
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ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
-1
Operating
Operating Transient Protection
Isolation Voltage
Input to Output
Input to Base-Plate
Output to Base-Plate
Operating Temperature
-55
Storage Temperature
-65
Voltage at ON/OFF input pin
-2
INPUT CHARACTERISTICS
Operating Input Voltage Range
9
28
Input Under-Voltage Lockout
Turn-On Voltage Threshold
9.1
9.5
Turn-Off Voltage Threshold
7.8
8.2
Lockout Voltage Hysteresis
1.3
Recommended External Input Capacitance
100
Input Filter Component Values (L\C)
0.5\13.2
Maximum Input Current
No-Load Input Current
225
Disabled Input Current
4
Response to Input Transient
1.7
Input Terminal Ripple Current
700
Recommended Input Fuse
OUTPUT CHARACTERISTICS
Output Voltage Set Point
23.76
24
Output Voltage Regulation
Over Line
±0.1
Over Load
±0.1
Over Temperature
-360
Total Output Voltage Range
23.4
Output Voltage Ripple and Noise
Peak-to-Peak
90
RMS
30
Operating Output Current Range
0
Output DC Current-Limit Inception
8
9
Output DC Current-Limit Shutdown Voltage
14
Back-Drive Current Limit while Enabled
0.6
Back-Drive Current Limit while Disabled
0
0.4
Maximum Output Capacitance
Output Voltage during Load Current Transient
Step Change in Output Current (0.1 A/µs)
850
Settling Time
1
Output Voltage Trim Range
-20
Output Voltage Remote Sense Range
Output Over-Voltage Protection
27.4
29.5
EFFICIENCY
#N/A!
#N/A!
100% Load
88
50% Load
89
Note 1: Output is terminated with 1 µF ceramic and 15 µF low-ESR tantalum
noise, consult SynQor applications support (e-mail: [email protected])
Note 2: Trim-up range is limited below 10% at low line and full load.
60
40
50
V
V
V
2250
2250
2250
100
135
18
Vdc
Vdc
Vdc
°C
°C
V
40
V
9.9
8.6
30
V
V
V
µF
µH\µF
A
mA
mA
V
mA
A
24.24
V
±0.3
±0.3
360
24.6
%
%
mV
V
160
55
7.5
10
mV
mV
A
A
V
A
mA
µF
24.5
325
6
50
400
Continuous
Continuous
Baseplate temperature
50V transient for 1 s; see Note 3
Typical ESR 0.1-0.2 Ω
Internal values; see Figure E
VIN min; trim up; in current limit
500V/mS; See Figure 12
RMS
Fast acting external fuse recommended
Over sample, line, load, temperature & life
20 MHz bandwidth
Full Load
Full Load
Subject to thermal derating
Output Voltage 10% Low
Negative current drawn from output
Negative current drawn from output
Vout nominal at full load (resistive load)
mV
50% to 75% to 50% IOUT max
ms
To within 1% VOUT nom
10
%
Across Pins 8 & 4; Figure C; see Note 2
10
%
Across Pins 8 & 4
31.6
V
Over full temp range
#N/A!
#N/A!
#N/A!
0
%
See Figure 1 for efficiency curve
0
%
See Figure 1 for efficiency curve
capacitors. For applications requiring reduced output voltage ripple and
Note 3:Start-up guaranteed above 9.9 V, but will operate down to 9V.
Product # MCOTS-C-28V-24-HP
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005764
Rev. 2
07/29/14
Page 3
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Technical Specification
MCOTS-C-28V-24-HP ELECTRICAL CHARACTERISTICS
Ta = 25 °C, Vin = 28dc 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.
Typ.
Max.
Units
Notes & Conditions
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DYNAMIC CHARACTERISTICS
Turn-On Transient
Turn-On Time
10
Start-Up Inhibit Time
180
200
220
Output Voltage Overshoot
0
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
30
Isolation Capacitance (input to output)
1000
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
125
Board Temperature
125
Transformer Temperature
125
Maximum Baseplate Temperature, Tb
100
FEATURE CHARACTERISTICS
Switching Frequency
240
260
280
ON/OFF Control
Off-State Voltage
2.4
18
On-State Voltage
-2
0.8
ON/OFF Control
Pull-Up Voltage
5
Pull-Up Resistance
50
Over-Temperature Shutdown OTP Trip Point
125
Over-Temperature Shutdown Restart Hysteresis
10
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
2.2
Calculated MTBF (MIL-217) MIL-HDBK-217F
1.3
Field Demonstrated MTBF
TBD
Note 1: Higher values of isolation capacitance can be added external to the module.
ms
ms
%
Full load, Vout=90% nom.
See Figure F
Maximum Output Capacitance
See Absolute Maximum Ratings
MΩ
pF
See Note 1
°C
°C
°C
°C
Package rated to 150 °C
UL rated max operating temp 130 °C
kHz
Isolation stage switching freq. is half this
V
V
Application notes Figures A & B
V
kΩ
°C
°C
106 Hrs.
106 Hrs.
106 Hrs.
Average PCB Temperature
80% load, 200LFM, 40 °C TA
80% load, 200LFM, 40 °C TA
STANDARDS COMPLIANCE
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1/R:2011-12
Basic Insulation
CAN/CSA-C22.2 No. 60950-1/A1:2011
EN60950-1/A12:2011
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.
Product # MCOTS-C-28V-24-HP
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005764
Rev. 2
07/29/14
Page 4
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
100
95
95
90
90
Efficiency (%)
100
85
85
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Efficiency (%)
Technical Charts
80
75
70
75
70
9 Vin
28 Vin
65
80
9 Vin
28 Vin
65
40 Vin
40 Vin
60
-55ºC
60
0
0.5
1
1.5
2
2.5
3 3.5 4 4.5 5
Load Current (A)
5.5
6
6.5
7
7.5
Figure 1: Efficiency at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
25ºC
Case Temperature (ºC)
100ºC
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
case temperature for minimum, nominal, and maximum input voltage.
30
30
27
24
Power Dissipation (W)
Power Dissipation (W)
25
20
15
10
9 Vin
5
28 Vin
40 Vin
0.5
1
1.5
2
2.5
3 3.5 4 4.5 5
Load Current (A)
5.5
6
6.5
7
7.5
Figure 3: Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at TCASE =25°C.
18
15
12
9
6
9 Vin
3
40 Vin
28 Vin
0
-55ºC
0
0
21
25ºC
Case Temperature (ºC)
100ºC
Figure 4: Power dissipation at nominal output voltage and 60% rated
power vs. case temperature for minimum, nominal, and maximum input
voltage.
8
30
7
25
Output Voltage (V)
6
Iout (A)
5
4
3
20
15
10
9 Vin
2
0
28 Vin
5
1
50
60
70
80
90
100
0
110
0
Base Plate Temperature (°C)
Figure 5: Maximum output current vs. base plate temperature (nominal input
voltage).
Product # MCOTS-C-28V-24-HP
Phone 1-888-567-9596
40 Vin
2
4
6
Load Current (A)
8
10
Figure 6: Output voltage vs. load current showing typical current limit
curves. See Current Limit section in the Application Notes.
www.synqor.com
Doc.# 005-0005764
Rev. 2
07/29/14
Page 5
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
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Technical Charts
Figure 7: Typical startup waveform. Input voltage pre-applied, Ch 1: Vout
(10V/div). Ch 2: ON|OFF (5V/div).
Figure 8: Turn-on transient at full resistive load and zero output capacitance
initiated by Vin. ON/OFF Pin previously low. Ch 1: Vout (10V/div). Ch 2: Vin
(20V/div).
Figure 9: Input terminal current ripple, iC, at full rated output current and
nominal input voltage with SynQor MCOTS filter module (2 A/div). Bandwidth:
20MHz. See Figure 9.
Figure 10: Output voltage ripple, Vout, at nominal input voltage and rated load
current (50 mV/div). Load Capacitance: 1uf ceramic capacitor. Bandwidth: 20
MHz. See Figure 10.
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: 1 µF ceramic capacitor. Ch 1:
Vout (500mV/div), Ch 2: Iout (2A/div).
Figure 12: Output voltage response to step-change in input voltage (500V/ms) at
full load current. Load cap: 100uf electrolytic capacitance. Ch1: Vout (2V/div),
Ch 2: Vin (20V/div).
Product # MCOTS-C-28V-24-HP
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005764
Rev. 2
07/29/14
Page 6
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Technical Charts
40
100
1
Forward Transmission (dB)
20
10
10
0
-10
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Output Impedance (ohms)
30
0.1
9 Vin
28 Vin
0.01
40 Vin
0.001
-20
-30
-40
-50
9 Vin
-60
28 Vin
-70
40 Vin
-80
10
100
1,000
10,000
Hz
100,000
Figure 13: Magnitude of incremental output impedance (Zout = vout/
iout) for minimum, nominal, and maximum input voltage at full rated
power.
10
100
1,000
Hz
10,000
100,000
Figure 14: Magnitude of incremental forward transmission (FT = vout/
vin) for minimum, nominal, and maximum input voltage at full rated
power.
35
100
15
Input Impedance (ohms)
Reverse Transmission (dB)
25
5
-5
-15
-25
-35
9 Vin
10
1
9 Vin
0.1
28 Vin
28 Vin
-45
40 Vin
40 Vin
0.01
-55
10
100
1,000
10,000
Hz
Figure 15: Magnitude of incremental reverse transmission (RT = iin/
iout) for minimum, nominal, and maximum input voltage at full rated
power.
100
1,000
Hz
10,000
100,000
Figure 16: Magnitude of incremental input impedance (Zin = vin/iin)
for minimum, nominal, and maximum input voltage at full rated power.
1 µF
ceramic capacitor
4.7 µH
source impedance
iC
VSOURCE
10
100,000
100 µF,
0.2Ω ESR
electrolytic capacitor
DC-DC
Converter
VOUT
15 µF,
300mΩ ESR
tantalum capacitor
Figure 17: Test set-up diagram showing measurement points for Input Terminal
Ripple Current (Figure 9) and Output Voltage Ripple (Figure 10).
Product # MCOTS-C-28V-24-HP
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Figure 18: Load current (10A/div) as a function of time (100us/div) when the
converter attempts to turn on into a 10 mΩ short circuit.
www.synqor.com
Doc.# 005-0005764
Rev. 2
07/29/14
Page 7
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Application Section
CONTROL FEATURES
This Mil-COTS converter series uses a two-stage power
conversion topology. The first stage is a buck-converter that
keeps the output voltage constant over variations in line, load,
and temperature. The second stage uses a transformer to
provide the functions of input/output isolation and voltage
step-up or step-down to achieve the output voltage required.
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(-).
The ON/OFF signal is active low (meaning that a low turns the
converter on). Figure A details four possible circuits for driving
the ON/OFF pin. Figure B is a detailed look of the internal ON/
OFF circuitry.
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BASIC OPERATION AND FEATURES
Both the first stage and the second stage switch at a fixed
frequency for predictable EMI performance. Rectification of the
transformer’s output is accomplished with synchronous rectifiers.
These devices, which are MOSFETs with a very low on-state
resistance, dissipate far less energy than Schottky diodes. This
is the primary reason that the converter has such high efficiency,
even at very low output voltages and very high output currents.
These converter are offered totally encased to withstand
harsh environments and thermally demanding applications.
Dissipation throughout the converter is so low that
it does not require a heatsink for operation in many
applications; however, adding a heatsink provides improved
thermal derating performance in extreme situations.
This series of converters use the industry standard footprint
and pin-out configuration.
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Pin 7 should be connected to Vout(+) and Pin 5 should be
connected to Vout(-) at the point on the board where regulation
is desired. A remote connection at the load can adjust for a
voltage drop only as large as that specified in this datasheet,
that is
[Vout(+) - Vout(-)] – [Vsense(+) - Vsense(-)] <
Sense Range % x Vout
Pins 7 and 5 must be connected for proper regulation of
the output voltage. If these connections are not made, the
converter will deliver an output voltage that is slightly higher
than its specified value.
Note: the output over-voltage protection circuit senses the
voltage across the output (pins 8 and 4) to determine when
it should trigger, not the voltage across the converter’s sense
leads (pins 7 and 5). Therefore, the resistive drop on the board
should be small enough so that output OVP does not trigger,
even during load transients.
ON/OFF
ON/OFF
Vin(_)
Vin(_)
Remote Enable Circuit
5V
Negative Logic
(Permanently
Enabled)
5V
ON/OFF
50k
ON/OFF
TTL/
CMOS
Vin(_)
Open Collector Enable Circuit
Vin(_)
100pF
Vin(_)
Direct Logic Drive
Figure A: Various circuits for driving the ON/OFF pin.
Product # MCOTS-C-28V-24-HP
50k
TTL
ON/OFF
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www.synqor.com
Figure B: Internal ON/OFF pin circuitry
Doc.# 005-0005764
Rev. 2
07/29/14
Page 8
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Application Section
It is not necessary for the user to add capacitance at the Trim
pin. The node is internally bypassed to eliminate noise.
To decrease the output voltage, the user should connect a
resistor between Pin 6 and Pin 5 (SENSE(-) input). For a desired
decrease of the nominal output voltage, the value of the resistor
should be
Total DC Variation of VOUT: For the converter to meet its full
specifications, the maximum variation of the dc value of VOUT, due
to both trimming and remote load voltage drops, should not be
greater than that specified for the output voltage trim range.
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OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the
user to adjust the output voltage across the sense leads up or
down according to the trim range specifications.
Rtrim-down =
511
(D%
)- 10.22 (kW)
where
D% =
Vnominal – Vdesired
Vnominal
PROTECTION FEATURES
x 100%
To increase the output voltage, the user should connect a
resistor between Pin 6 and Pin 7 (SENSE(+) input). For a desired
increase of the nominal output voltage, the value of the resistor
should be
Rtrim-up =
where
(
5.11VOUT x (100+D%)
1.225D%
_ 511 _ 10.22
D%
)
(kW)
Vout = Nominal Output Voltage
Trim graphs show the relationship between the trim resistor
value and Rtrim-up and Rtrim-down, showing the total range the
output voltage can be trimmed up or down.
Note: the TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
output voltage too high may cause the over-voltage protection
circuit to engage, particularly during transients.
Trim Resistance (kΩ)
100,000
10,000
1,000
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” on our
website. 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 specifications 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.
Output Over-Voltage Limit: If the voltage across the output
pins exceeds the Output Over-Voltage Protection threshold, the
converter will immediately stop switching. This prevents damage
to the load circuit due to 1) excessive series resistance in output
current path from converter output pins to sense point, 2) a
release of a short-circuit condition, or 3) a release of a current
limit condition. Load capacitance determines exactly how high
the output voltage will rise in response to these conditions. After
200 ms the converter will automatically restart.
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 Limit: The maximum current limit remains
constant as the output voltage drops. However, once the
impedance of the load across the output is small enough to
make the output voltage drop below the specified Output
DC Current-Limit Shutdown Voltage, the converter turns off.
100
10
1
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
% Increase in Vout
% Decrease in Vout
Figure C: Trim graph for trim-up, trim down.
Product # MCOTS-C-28V-24-HP
Phone 1-888-567-9596
The converter then enters a “hiccup” mode where it repeatedly
turns on and off at a 5 Hz (nominal) frequency with 5% duty
cycle until the short circuit condition is removed. This prevents
excessive heating of the converter or the load board.
www.synqor.com
Doc.# 005-0005764
Rev. 2
07/29/14
Page 9
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Application Section
APPLICATION CONSIDERATIONS
Application Circuits: Figure D provides a typical circuit diagram
which details the input filtering and voltage trimming.
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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.
Vout(+)
Vin(+)
Vin
External
Input
Filter
Electrolytic
Capacitor
Vsense(+)
ON/OFF
Trim
Vsense(_)
Vin(_)
Rtrim-up
or
Cload
Rtrim-down
Iload
Vout(_)
Figure D: Typical application circuit (negative logic unit, permanently enabled).
Input Filtering and External Capacitance: Figure E 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. The recommended external input capacitance
is specified in the Input Characteristics section on the Electrical
Characteristics page. More detailed information is available in
the application note titled “EMI Characteristics” on the SynQor
website.
L
Vin(+)
Vout(+)
Internal
Input
Filter
C
Converter
Vin(_)
Vout(-)
Figure E: Internal Input Filter Diagram
Product # MCOTS-C-28V-24-HP
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Doc.# 005-0005764
Rev. 2
07/29/14
Page 10
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Application Section
When the ON/OFF pin goes high after t2, the Startup Inhibit
Period has elapsed, and the output turns on within the typical
Turn-On Time.
Thermal Considerations: The maximum operating baseplate temperature, TB, is 100 ºC. Refer to the thermal derating
curve, Figure 5, to see the available output current at baseplate
temperatures below 100 ºC.
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Startup Inhibit Period: The Startup Inhibit Period ensures
that the converter will remain off for approximately 200 ms
when it is shut down for any reason. When an output short is
present, this generates a 5 Hz “hiccup” mode, which prevents the
converter from overheating. In all, there are seven ways that the
converter can be shut down, initiating a Startup Inhibit Period:
•
•
•
•
•
•
•
Input Under-Voltage Lockout
Input Over-Voltage Lockout
Output Over-Voltage Protection
Over Temperature Shutdown
Current Limit
Short Circuit Protection
Turned off by the ON/OFF input
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, RTH , of the chosen heatsink
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:
BA
Figure F shows three turn-on scenarios, where a Startup Inhibit
Period is initiated at t0, t1, and t2:
Before time t0, 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 Startup Inhibit Period is
initiated. At the end of this delay, the ON/OFF pin is evaluated,
and since it is active, the unit turns on.
max
Pdiss =
T -T
B
RTH
A
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.
At time t1, the unit is disabled by the ON/OFF pin, and it cannot
be enabled again until the Startup Inhibit Period has elapsed.
Vin
Under-Voltage
Lockout TurnOn Threshold
ON/OFF
(neg logic)
ON
OFF ON
Vout
OFF
ON
10ms
(turn on time)
200ms
215ms
(initial start-up
inhibit period)
(typical start-up
inhibit period)
t1
t0
200ms
t
t2
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # MCOTS-C-28V-24-HP
Phone 1-888-567-9596
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Doc.# 005-0005764
Rev. 2
07/29/14
Page 11
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Application Section
FULL FEATURE APPLICATION NOTES
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This section provides some basic application information for the
full-feature version of the MCOTS series converter.
attempts a start at the same time as the minimum number of
additional units necessary to sustain the load condition. For
example, three 50 amp units starting into a 90 amp load would
require two units to simultaneously attempt a start. The Start Sync
connection synchronizes these starting attempts and provides a
more consistent and reliable start-up sequqnce. For details about
the “hiccup” mode ore repeated startup attempts, please see the
“Startup Inhibit Period” note in the Technical Specification.
All units in this product family include back-drive protection to
simplify the user of multiple converters in a parallel or sequencing
application. However, any voltage applied to the output of the
converter should be kept below 120% of the rated output voltage
of the converter.
In addition to back-drive protection, these units include the
following features (pins):
Current Share (pin C): The active current share feature allows
for N + 1 and parallel applications. To achieve load sharing,
directly connect the I share pins of multiple units. The load current
will share equally among the multiple units (±5% at full rated
current). It is important that the Vin(-) pins of the sharing units
be directly connected and NOT placed outside of an EMI filter or
other impedance path. The voltage at the I Share pin will range
from 0 to 5 volts (at full rated current), referenced to the primaryside ground, Vin(-).
Start Sync (pin B): The Start Synchronization pin will allow
a more consistent start-up sequence. To operate this feature,
connect together the Start-Sync pins of multiple current-sharing
units. This will permit immediate start-up with loads greater than
the current limit of a single unit. Without this connection, any
set of converters attempting to asynchronously start (or re-start)
with a load greater than the current limit of a single unit will
“hiccup”. This “hiccup” mode will continue until one converter
Product # MCOTS-C-28V-24-HP
Phone 1-888-567-9596
Clock Sync (pin A): The External Clock Synchronization pin
provides the ability for the user to control the EMI signature and
synchronize sensitive circuitry to quiet periods in the converter
operation. With this option, the converter can be synchronized
to an external clock signal whose frequency is greater than that
of the free-running internal clock. However, substantially raising
the converter’s frequency will reduce its efficiency. Therefore,
the recommended frequency range for the external clock
synchronization signal applied to this pin is listed in the Technical
Specification.
The following requirements should also be met:
• The external clock signal should be referenced to the negative
input voltage, Vin(-).
• The high level of the signal should be between 3.5V and 5.0V.
• The low level should be between -0.5V and +1.2V.
• Do not apply a clock signal lower than the specified
frequency.
www.synqor.com
Doc.# 005-0005764
Rev. 2
07/29/14
Page 12
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
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Standard Mechanical Drawing
2.486 [63.14]
2.000 [50.80]
SEATING PLANE HEIGHT
0.495±0.025
[ 12.57±0.63 ]
PIN EXTENSION
0.180
[4.57]
0.700 [17.78]
7
6
5
4
8
0.004 [0.10]
TOP VIEW
1.900 2.386
[48.26] [60.60]
1.900
[48.26]
0.01
[0.3]
3
1
0.30
[7.6]
B
A
2
1
0.400 [10.16]
THREADED INSERT
SEE NOTE 1
(4 PLCS)
0.600
0.800
1.000
1.400
[15.24]
[20.32]
[25.40]
[35.56]
PIN DESIGNATIONS
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 1-3, 5-7, A, B, AND C ARE 0.040” (1.02mm) DIA. WITH 0.080”
(2.03mm) DIA. STANDOFFS.
4) PINS 4 AND 8 ARE 0.080” (2.03mm) DIA. WITH 0.125” (3.18mm)
DIA STANDOFFS
5) ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
6) WEIGHT: 4.7 oz. (134 g) TYPICAL
7) ALL DIMENSIONS IN INCHES(mm)
8) TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
Product # MCOTS-C-28V-24-HP
C
Phone 1-888-567-9596
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Pin
1
2
Name
Vin(+)
ON/OFF
A
B
C
3
4
5
6
7
8
CLOCK SYNC
START SYNC
I SHARE
IN RTN
OUT RTN
SENSE(–)
TRIM
SENSE(+)
Vout(+)
Function
Positive input voltage
TTL input to turn converter on and off,
referenced to Vin(–), with internal pull up.
Clock synchronization
Startup synchronization
Single wire parallel signal
Input Return
Output Return
Negative remote sense1
Output voltage trim2
Positive remote sense3
Positive output voltage
Notes:
1)
SENSE(–) should be connected to Vout(–) either remotely or
at the converter.
2)
Leave TRIM pin open for nominal output voltage.
3)
SENSE(+) should be connected to Vout(+) either remotely or
at the converter.
4)
Pins A, B, and C are populated on Full Feature version only.
Doc.# 005-0005764
Rev. 2
07/29/14
Page 13
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
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Flanged Mechanical Drawing
3.150 [80.01]
SEATING
PLANE
HEIGHT
0.495±0.025
[ 12.57±0.63 ]
2.950 [74.93]
2.486 [63.14]
PIN
EXTENSION
0.180
[4.57]
0.700 [17.78]
4
5
7
6
8
TOP VIEW
1.300
[33.02]
0.010 [0.25]
1.866
[47.40]
0.31
[7.9]
1.900
[48.26]
2.386
[60.60]
3
1
0.775±0.020
[ 19.69±0.50 ]
.130 [3.30]
SEE NOTE 1
(6 PLCS)
C
B
A
FLANGE
THICKNESS
0.125
[3.18]
2
1
0.400 [10.16]
0.600 [15.24]
0.800 [20.32]
1.000 [25.40]
1.400 [35.56]
PIN DESIGNATIONS
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 1-3, 5-7, A, B, AND C ARE 0.040” (1.02mm) DIA. WITH 0.080”
(2.03mm) DIA. STANDOFFS.
4) PINS 4 AND 8 ARE 0.080” (2.03mm) DIA. WITH 0.125” (3.18mm)
DIA STANDOFFS
5) ALL PINS: MATERIAL: COPPER ALLOY
FINISH: MATTE TIN OVER NICKEL PLATE
6) WEIGHT: 4.9 oz. (140 g) TYPICAL
7) ALL DIMENSIONS IN INCHES(mm)
8) TOLERANCES: X.XXIN +/-0.02 (X.Xmm +/-0.5mm)
X.XXXIN +/-0.010 (X.XXmm +/-0.25mm)
Product # MCOTS-C-28V-24-HP
Phone 1-888-567-9596
www.synqor.com
Pin
1
2
Name
Vin(+)
ON/OFF
A
B
C
3
4
5
6
7
8
CLOCK SYNC
START SYNC
I SHARE
IN RTN
OUT RTN
SENSE(–)
TRIM
SENSE(+)
Vout(+)
Function
Positive input voltage
TTL input to turn converter on and off,
referenced to Vin(–), with internal pull up.
Clock synchronization
Startup synchronization
Single wire parallel signal
Input Return
Output Return
Negative remote sense1
Output voltage trim2
Positive remote sense3
Positive output voltage
Notes:
1)
SENSE(–) should be connected to Vout(–) either remotely or
at the converter.
2)
Leave TRIM pin open for nominal output voltage.
3)
SENSE(+) should be connected to Vout(+) either remotely or
at the converter.
4)
Pins A, B, and C are populated on Full Feature version only.
Doc.# 005-0005764
Rev. 2
07/29/14
Page 14
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Qualifications & Screening
Mil-COTS Qualification
Test Name
# Tested Consistent with MIL(# Failed)
STD-883F Method
Details
Life Testing
15
(0)
5
(0)
8
(0)
10
(0)
15
(0)
7
(0)
2
(0)
Method 1005.8
MIL-STD-202,
Methods 201A & 213B
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Shock-Vibration
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
Consistent with MIL-STD883F Method 5005
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
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-610, Class III
Temperature Cycling
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-2008
●
●
Final Electrical Test
Final Visual Inspection
●
Mil-COTS MIL-STD-810G Qualification Testing
MIL-STD-810G Test
Fungus
Altitude
Method
508.6
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-28V-24-HP
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005764
Rev. 2
07/29/14
Page 15
MCOTS-C-28V-24-HP
Output: 24V
Current: 7.5A
Ordering Information
Ordering Information/ Part Numbering
Example MCOTS-C-28V-24-HP-N-S
Not all combinations make valid part numbers, please contact SynQor for availability.
Product
Input Voltage
Output
Voltage
Package
Screening
Level
Heatsink Option
Options
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Family
MCOTS
C: Converter
28V: 9-40V
1R8:1.8V
3R3:3.3V
05:5V
7R5:7.5V
12:12V
15:15V
24:24V
28:28V
40:40V
48:48V
N:Normal Threaded
HP:Half Brick Peta
D:Normal
Non-Threaded
S: S-Grade
M: M-Grade
[ ]:Standard Feature
F:Full Feature
F:Flanged
APPLICATION NOTES
PATENTS
A variety of application notes and technical white papers can be downloaded
in PDF format from our website.
SynQor holds the following U.S. patents, one or more of which apply to
each product listed in this document. Additional patent applications may
be pending or filed in the future.
Contact SynQor for further information and to order:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # MCOTS-C-28V-24-HP
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Phone 1-888-567-9596
5,999,417
6,222,742
6,545,890
6,577,109
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.
Information furnished by SynQor is believed to be accurate and reliable.
However, no responsibility is assumed by SynQor for its use, nor for any
infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any
patent or patent rights of SynQor.
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Doc.# 005-0005764
Rev. 2
07/29/14
Page 16
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