Model: 3735-S28

3735-S28

26 – 40 Watt Hybrid DC-DC Converter

Features

Completely self contained Thick Film Hybrid DC-DC Converter

For MIL-STD 704/1275 applications

No External Filter Caps required

Fully Isolated design

Inhibit-not function

Power on soft start

Short Circuit protection

Fully hermetic package

Fully Isolated design with magnetically coupled feedback

No Optocouplers

Specifications

Input: 28 VDC

Input Range (Continuous): 15 VDC to 50 VDC

Input Range (Continuous): 18 VDC to 50 VDC

Transient Survival Voltage: 80 VDC

Isolation Input to Output: 500 VDC

Isolation Output to Case: 100 VDC

Storage Temp: -55 °C to +150 °C

Shock: 50 G's

Acceleration: 500 G's

Vibration: 30 G's

Weight: 65 gms typical

Environment

Grade I:

Full Output Power at T_case = 85°C

Minimum Output Power at T_case = -55°C

Linearly derates to zero at T_case = 115

TID up to kRad(Si)
No SEE up to 60MeV*cm²/mg

Grade M:

Full Output Power at T_case = 85°C

Minimum Output Power at T_case = -55°C

Linearly derates to zero at T_case = 115

TID up to kRad(Si)
No SEE up to 60MeV*cm²/mg

Grade E:

Full Output Power at T_case = 125°C

Minimum Output Power at T_case = -55°C

Linearly derates to zero at T_case = 135

TID up to kRad(Si)
No SEE up to 60MeV*cm²/mg

Additional Notes

High Power Density

High Efficiency

Single inputs have Remote Sense pins

Input Ripple Filter

Output Common Mode Filter

Single Output Devices

Toggle Columns: Parameter - Conditions

Parameters	Conditions	3735-S28 (40W) MIN	3735-S28 (40W) TYP	3735-S28 (40W) MAX
Output Voltage (FLD)	—	+27.3	+28.0	+28.3
Output current	V_{in min} — V_{in max}	.143A	-	1.43A
Efficiency	P_out = max rated load	82%	84%	-
Line regulation	P_out = max rated load V_{in min} — V_{in max}	-	20mV	40mV
Load regulation	P_out = 10% to F.L.	-	50mV	100mV
Output ripple	F.L. BW 2 MHz mV_pp	-	150	300

Pinout Table

3735-SXX
Pin-1: + input
Pin-2: inhibit-not
Pin-3: output adjust
Pin-4: output return
Pin-5: + output
Pin-6: N/C
Pin-7: N/C
Pin-8: case
Pin-9: N/C
Pin-10: + input return