Model: 3721-S28

3721-S28

15 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 (Full Power): 18 VDC to 50 VDC

Transient Survival Voltage: 80 VDC

Isolation Input to Case: 500 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

Single Output Devices

Toggle Columns: Parameter - Conditions

Parameters	Conditions	3721-S28 (15W) MIN	3721-S28 (15W) TYP	3721-S28 (15W) MAX
Output Voltage (FLD)	—	+27.4	+28.0	+28.5
Output current	V_{in min} — V_{in max}	0.0214	-	0.214mA
Efficiency	P_out = max rated load	78%	83%	-
Line regulation	P_out = max rated load V_{in min} — V_{in max}	-	280mV	560mV
Load regulation	P_out = 10% to F.L.	-	340mV	132mV
Output ripple	F.L. BW 2 MHz mV_pp	-	300	600

Pinout Table

3721-SXX
Pin-1: inhibit not
Pin-2: N/C
Pin-3: output ret
Pin-4: + output
Pin-5: N/C
Pin-6: case
Pin-7: input ret
Pin-8: + input

Case Styles

Part Number Designator	Case Style	Pin Count	Mounting	Step File
F – 12 Pin	Case Style 3	12	Solder Sealed Flanged PCB Mount	Download