COTS Component for Defense & Avionics Applications
Environmental Performance to MIL STD 810
10 to 50 VDC Transient Input Range
10 to 40 VDC Steady State Input Range
55
˚C
to 100
˚C
Operation
Cooling Plates and Mounting Holes for Easy Integration
Synchronous Rectification on Low Voltage Outputs
MIL STD 461 and DEF STAN 59 11
MIL STD 1275 and DEF STAN 61 5
Frequency Synchronization
Thermal Warning Signal
The MTC35 & 50 are COTS DC-DC converters developed specifically for the defense and avionics market. These products have full military
specifications while offering the short lead-times and cost benefits of a COTS component.
The products offer excellent size, efficiency and EMC performance and the input range is designed to provide short term operation over 10–50 VDC to
enable the converter to work at full power through the dips and surges commonly seen in vehicle and aircraft applications.
Comprehensive control functions such as voltage trim, remote sense, remote on/off and frequency synchronization to an external source are standard
features. The MTC35 & 50 contain an over temperature warning signal that gives user control over the temperature shutdown function of the converter.
When used in conjunction with the DSF and FSO input filter module the MTC35 & 50 are compliant to MIL-STD 461F CE/CS,
MIL-STD1275A-D and MIL-STD 704B-F as well as DEF-STAN-59-411 and DEF-STAN 61-5 part 6 issue 5.
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Input Characteristics
Characteristic
Input Voltage
Transient Input Voltage Range
UVLO Turn On
UVLO Turn Off
Input Current
Inhibited Input Current
Inrush Current
Input Reverse Voltage Protection
4
40
mA
A
Minimum
10
10
9.5
Typical
28
Maximum
40
50
8.8
Units
VDC
VDC
VDC
VDC
Notes & Conditions
Continuous
50 VDC for 100 ms
See models and ratings table, typical and
measured at 28 VDC input
Peak value
External components required
Output Characteristics
Characteristic
Output Voltage
Output Voltage Adjustment
Output Current
Output Set Tolerance
Minimum Load
Single O/P
Ripple & Noise
Vout
≤5V
Vout >5V
Overvoltage Protection
Overload Protection
Short Circuit Protection
Overtemperature Protection
Remote Sense
Load Regulation
Single O/P
1
±4
±1
300 x Iout max
100
20
0.3
Minimum
-20
0
120
110
Typical
Maximum
+10
±1.5
50
100
140
140
105
10
Units
VDC
%
A
%
A
mV
%
%
˚C
%
%
%
%
µF
ms
ms
%/˚C
Notes & Conditions
See models and ratings table for details
-10% min voltage trim for 3V3 version
See models and ratings table for details
No minimum load required
Pk-pk at 100% load and 20 MHz bandwidth
Vout nominal
At Vin nominal, see figure 3
Output turns off until the short is removed
Baseplate Temperature
Total voltage compensation. Includes Vtrim.
See fig 4.
Vout nominal
Recovery within 1% in less than 500µs for a
50% load change at 0.1A/µs
Vout nominal at 10-40 Vin
For start up within 100 ms
Transient Response
Line Regulation
Maximum Output Capacitance
Start Up Time
Start Up Rise Time
Temperature Coefficient
Models & Ratings
Output Power
35
35
35
35
35
50
50
50
50
50
W
W
W
W
W
W
W
W
W
W
Output Voltage
3.3
5.0
12.0
15.0
28.0
3.3
5.0
12.0
15.0
28.0
VDC
VDC
VDC
VDC
VDC
VDC
VDC
VDC
VDC
VDC
Output Current
10.00
7.00
2.90
2.30
1.30
15.00
10.00
4.20
3.33
1.80
A
A
A
A
A
A
A
A
A
A
Input Current
(1)
No Load
Full Load
100 mA
1.49 A
100 mA
1.45 A
100 mA
1.41 A
100 mA
1.40 A
100 mA
1.48 A
100 mA
2.18 A
60 mA
2.15 A
70 mA
2.13 A
70 mA
2.13 A
120 mA
2.15 A
Efficiency
(1)
84%
86%
88%
88%
88%
82%
83%
84%
84%
83%
Model Number
MTC3528S3V3
MTC3528S05
MTC3528S12
MTC3528S15
MTC3528S28
MTC5028S3V3
MTC5028S05
MTC5028S12
MTC5028S15
MTC5028S28
Note:
1. Typical and measured at 28 V input
2. Total of voltage trim and remote sense is +10% max.
2
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General Specifications
Characteristic
Efficiency
Isolation Voltage
Switching Frequency
Frequency Synchronization
MTBF
Remote On/Off
Rth Case - Ambient
On = >3.5 V or open circuit; Off = <1.8 V
7.12
˚C/W
1500
1000
1000
400
Minimum
Typical
85
Maximum
Units
%
VDC
400
500
kHz
kHz
Notes & Conditions
See models table and performance graphs
(fig. 28-34)
Input to output
Input to case
Output to case
Fixed
See note.
>1 MHrs to MIL-HDBK-217F at 25 ˚C, GF
See table below
Note:
Control signal TTL 0-5 VDC square wave. The trigger is the falling edge.
MTBF
Model
MTC3528S3V3
MTC3528S05
MTC3528S12
MTC3528S15
MTC3528S28
MTC5028S3V3
MTC5028S05
MTC5028S12
MTC5028S15
MTC5028S28
25 ˚C GB
2,124,329 Hrs
1,908,099 Hrs
2,528,046 Hrs
2,589,621 Hrs
2,222,434 Hrs
1,754,739 Hrs
2,160,519 Hrs
2,105,612 Hrs
2,086,654 Hrs
1,894,824 Hrs
40 ˚C GF
347,472 Hrs
326,642 Hrs
448,962 Hrs
456,578 Hrs
368,167 Hrs
269,617 Hrs
357,885 Hrs
351,150 Hrs
345,227 Hrs
290,456 Hrs
Environmental
Characteristic
Operating Temperature
Storage Temperature
Humidity
Salt Atmosphere
Altitude
Shock
Vibration
Bump
15
Minimum
-55
-60
Typical
Maximum
100
125
95
48
70000
75
2000
40
Units
˚C
˚C
%
Hrs
Ft
g
Hz
g
Relative humidity,
MIL-STD-810F Method 507.4
MIL-STD 810F Method 509.4
MIL-STD 810F Method 500.4
MIL-STD 810F Method 516.5
MIL-STD 810F Method 514.5,
table 514.5-VIII
2000 bumps in each axis
MIL-STD 810F Method 516.5
Notes & Conditions
Baseplate temperature. Start up is at -55 ˚C.
Full specification achievable at -40 ˚C
Electromagnetic Compatibility
EMC
Conducted Emissions
Standard
MIL-STD-461E/F
DEF-STAN 59-411
EN55022
MIL-STD-1275A-D
MIL-STD-704B-F
Conducted Susceptibility
Note:
0.5
source impedance
Test Level
CE102
DCE01/DCE02
Class B
Spikes
Surge
Ripple
CS101, CS114,
CS115, CS116
Criteria
Notes & Conditions
When used in conjuction with
standard EMI filter, DSF and FSO
series
Immunity
±250 V for 100 µs
100 V for 50 ms (see note)
14 VAC pk-pk
50 V for 10 ms
When used in conjuction with
standard surge protection module,
DSF and FSO series
When used in conjuction with
standard surge protection module,
DSF and FSO series
MIL-STD-461E/F
DEF-STAN 62-5 part 6 iss.5
3
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Synchronization
The internal switching frequency can be synchronized to an external source within the range 450 to 550 kHz. If two modules or more are
synchronized, they will run at the highest frequency. Connect synchronization pins directly together.
Sync
Converter 1
Load
Sync
Converter 2
Load
Figure 1.
Synchronization Diagram
Thermal Warning
The thermal warning pin is an open collector signal with it’s emitter connected to -Vin. Transistor is off under normal conditions and is turned on when
trip threshold is exceeded typically 105 ˚C. The output of the module can be optionally turned off under a high temperature condition by connecting the
Thermal Warning (TW) pin directly to the Remote On/Off pin (Thermal Shutdown). The output will recover automatically when the case temperature is
reduced.
+Vin
+Vout
Remote On/Off
Thermal Warning (Tw)
Load
-Vin
-Vout
Figure 2.
Thermal Shutdown Connection Diagram
Overload Protection
Figure 3.
Over current Profile
After reaching the limit between 110% to 140% of Inom (current or power limit point), the output voltage will reduce down to 40-50% of nominal below
which the unit will enter trip and restart mode. Automatic recovery when overload is removed.
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