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Product Series: 3721

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3721

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 Tcase = 85°C
Minimum Output Power at Tcase = -55°C
Linearly derates to zero at Tcase = 115
TID up to kRad(Si)
No SEE up to 60MeV*cm2/mg
Grade M:
Full Output Power at Tcase = 85°C
Minimum Output Power at Tcase = -55°C
Linearly derates to zero at Tcase = 115
TID up to kRad(Si)
No SEE up to 60MeV*cm2/mg
Grade E:
Full Output Power at Tcase = 125°C
Minimum Output Power at Tcase = -55°C
Linearly derates to zero at Tcase = 135
TID up to kRad(Si)
No SEE up to 60MeV*cm2/mg

Single Output Devices

Toggle Columns: Parameter - Conditions
Parameters Conditions 3721-S03.3 (15W) 3721-S05 (15W) 3721-S12 (15W) 3721-S15 (15W) 3721-S28 (15W) 3721-S48 (15W)
3721-S03.3 (15W) MIN 3721-S03.3 (15W) TYP 3721-S03.3 (15W) MAX 3721-S05 (15W) MIN 3721-S05 (15W) TYP 3721-S05 (15W) MAX 3721-S12 (15W) MIN 3721-S12 (15W) TYP 3721-S12 (15W) MAX 3721-S15 (15W) MIN 3721-S15 (15W) TYP 3721-S15 (15W) MAX 3721-S28 (15W) MIN 3721-S28 (15W) TYP 3721-S28 (15W) MAX 3721-S48 (15W) MIN 3721-S48 (15W) TYP 3721-S48 (15W) MAX
Output Voltage (FLD) — +3.2 +3.3 +3.4 +4.9 +5.0 +5.1 +11.76 +12.0 +12.24 +14.7 +15.0 +15.3 +27.4 +28.0 +28.5 +47.0 +48.0 +49.0
Output current Vin min — Vin max 0.015 - 1.5A 0.012 - 1.2A 0.005 - 0.5A 0.004 - 0.4A 0.0214 - 0.214mA 0.0125 - 0.125mA
Efficiency Pout = max rated load 70% 76% - 72% 81% - 77% 81% - 78% 83% - 78% 83% - 77% 81% -
Line regulation Pout = max rated load
Vin min — Vin max		 - 33mV 66mV - 50mV 100mV - 120mV 240mV - 150mV 300mV - 280mV 560mV - 150mV 300mV
Load regulation Pout = 10% to F.L. - 70mV 132mV - 60mV 150mV - 240mV 360mV - 180mV 450mV - 340mV 132mV - 70mV 450mV
Output ripple F.L. BW 2 MHz
mVpp		 - 50 100 - 50 100 - 120 240 - 150 300 - 300 600 - 500 1000

Dual Output Devices

Toggle Columns: Parameter - Conditions
Parameters Conditions 3721-D05 (15W) 3721-D12 (15W) 3721-D15 (15W)
3721-D05 (15W) MIN 3721-D05 (15W) TYP 3721-D05 (15W) MAX 3721-D12 (15W) MIN 3721-D12 (15W) TYP 3721-D12 (15W) MAX 3721-D15 (15W) MIN 3721-D15 (15W) TYP 3721-D15 (15W) MAX
Output Voltage (FLD) — +4.9
-4.9		 +5.0
-5.0		 +5.1
-5.1		 +11.76
-11.76		 +12.0
-12.0		 +12.24
-12.24		 +14.7
-14.7		 +15.0
-15.0		 +15.3
-15.3
Output current Vin min — Vin max ±0.06mA - ±0.6A ±0.025mA - ±0.25A ±0.02mA - ±0.2A
Efficiency Pout = max rated load 72% 81% - 77% 81% - 78% 83% -
Line regulation Pout = max rated load
Vin min — Vin max		 - ±50mV ±100mV - ±120mV ±240mV - ±150mV ±300mV
Load regulation Pout = 10% to F.L. - ±60mV ±150mV - ±240mV ±360mV - ±180mV ±450mV
Output ripple F.L. BW 2 MHz
mVpp		 - 50 100 - 120 240 - 150 300

Triple Output Devices

Toggle Columns: Parameter - Conditions
Parameters Conditions 3721-T3.3/12 (15W) 3721-T3.3/15 (15W) 3721-T05/12 (15W) 3721-T05/15 (15W)
3721-T3.3/12 (15W) MIN 3721-T3.3/12 (15W) TYP 3721-T3.3/12 (15W) MAX 3721-T3.3/15 (15W) MIN 3721-T3.3/15 (15W) TYP 3721-T3.3/15 (15W) MAX 3721-T05/12 (15W) MIN 3721-T05/12 (15W) TYP 3721-T05/12 (15W) MAX 3721-T05/15 (15W) MIN 3721-T05/15 (15W) TYP 3721-T05/15 (15W) MAX
Output Voltage (FLD) +lout = -lout+ +3.2
+11.76
-11.76
 +3.3
+12.0
-12.0		 +3.4
+12.24
-12.24		 +3.2
+14.7
-14.7
 +3.3
+15.0
-15.0		 +3.4
+15.3
-15.3		 +4.9
+14.9
-14.9
 +5.0
+15.0
-15.0		 +5.1
+15.1
-15.1		 +4.9
+14.7
-14.7
 +5.0
+15.0
-15.0		 +5.1
+15.3
-15.3
Output current Vin min — Vin max 15mA
±0.0312mA		 - 1.5A
±312mA		 15mA
±0.025mA		 - 1.5A
±0.25mA		 15mA
±0.0312mA		 - 1.5mA
±0.3125mA		 0.15mA
±0.025mA		 - 1.5A
±0.250mA
Efficiency Pout = max rated load 70% 76% - 70% 76% - 72% 81% - 72% 81% -
Line regulation Pout = max rated load
Vin min — Vin max		 - 33mV
120mV		 66mV
240mV		 - 33mV
15mV		 66mV
300mV		 - 50mV
120mV		 100mV
240mV		 - 50mV
150mV		 100mV
300mV
Load regulation Pout = 10% to F.L. - 70mV
240mV		 132mV
360mV		 - 70mV
180mV		 132mV
450mV		 - 60mV
240mV		 150mV
360mV		 - 60mV
180mV		 150mV
450mV
Output ripple F.L. BW 2 MHz
mVpp		 - 50
120		 100
240		 - 50
150		 100
300		 - 50
120		 100
240		 - 50
150		 100
300

Pinout Table

3721-SXX 3721-DXX 3721-TXX
Pin-1: inhibit not Pin-1: + input Pin-1: inhibit not
Pin-2: N/C Pin-2: + output Pin-2: + V main output
Pin-3: output ret Pin-3: + output ret Pin-3: com output return
Pin-4: + output Pin-4: - output Pin-4: + V output
Pin-5: N/C Pin-5: N/C Pin-5: - V output
Pin-6: case Pin-6: case Pin-6: case gnd
Pin-7: input ret Pin-7: input ret Pin-7: input return
Pin-8: + input Pin-8: + input 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