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Product Series: 3845

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3845

120 Watt Rad Hard 100K+® Hybrid DC-DC Booster

Features

RadHard TID >100kRad(Si)
2:1 Margin: Operates beyond 200kRad TID
No SEE: LET > 82meV*cm^2/mg
Proton Resistant: No optocouplers used
Specifically designed for redundant space applications
Completely self contained Thick Film Hybrid DC-DC Converter
No External Filter Caps required
Inhibit-not function
Power on soft start
200kHz operation for low ripple and fast response time
Short Circuit protection

Specifications

Input: 12 VDC
Input Range (Continuous): 9 VDC to 20 VDC
Input Range (Full Power): 8 VDC to 20 VDC
Isolation Input to Case: 500 VDC
Isolation Output to Case: 500 VDC
Storage Temp: -55 °C to +150 °C
Shock: 50 G's
Acceleration: 500 G's
Vibration: 30 G's
Weight: 160 gms typical

Environment

Grade EU:
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 L:
Full Output Power at Tcase = 85°C
Minimum Output Power at Tcase = -55°C
Linearly derates to zero at Tcase = 115
TID up to 45kRad(Si)
No SEE up to 60MeV*cm2/mg
Grade LE:
Full Output Power at Tcase = 125°C
Minimum Output Power at Tcase = -55°C
Linearly derates to zero at Tcase = 135
TID up to 45kRad(Si)
No SEE up to 60MeV*cm2/mg
Grade S:
Full Output Power at Tcase = 85°C
Minimum Output Power at Tcase = -55°C
Linearly derates to zero at Tcase = 115
TID up to 100kRad(Si)
No SEE up to 60MeV*cm2/mg
Grade SE:
Full Output Power at Tcase = 125°C
Minimum Output Power at Tcase = -55°C
Linearly derates to zero at Tcase = 135
TID up to 100kRad(Si)
No SEE up to 60MeV*cm2/mg

Additional Notes

The 3845 is a Rad Hard Non-isolated Booster with a 9VDC to 20 VDC input and a 28VDC output with 120W capability. Model 3845 is a GaN design specifically for cubesat, commercial space and traditional space applications. It features high efficiency and short circuit protection. 3845 is packaged in a 2.62″ x 2.71″ flanged case.

Unlike simple DC-DC boosters which allow unlimited current when the output voltage is less than the input voltage, Model 3845 contains an internal FET that opens the input/output connection when the output voltage is less than the input voltage. This feature not only provides short circuit protection but also allows the output to be inhibited when commanded.

Two modes of voltage regulation are provided. The first mode is the conventional precise regulation and is selected by the user by connecting 28VDC to the load return to Pin 12.

The second mode is a precision droop regulation, which allows paralleling two or more booster units higher power The droop is approximately 2VDC from no load o full load. Droop regulation is selected by the user by connection the 28VDC load return to Pin 11.

 

Single Output Devices

Toggle Columns: Parameter - Conditions
Parameters Conditions 3845-S28 (120W)
3845-S28 (120W) MIN 3845-S28 (120W) TYP 3845-S28 (120W) MAX
Output set voltage — +27.8 +28.0 +28.2
Output current Vin min — Vin max — — 4.28A
Efficiency Pout = max rated load 90 92 —
Line regulation Pout = max rated load
Vin min — Vin max		 — 50mV 250mV
Load regulation Pout = 10% to F.L. — 50mV 250mV
Output ripple F.L. BW 2 MHz
mVpp		 — 150 350
Input Current (@12V) Inhibited — 37mA —

Pinout Table

3845
Pin-1: Soft Start
Pin-2: Inhibit - NOT
Pin-3: N/C
Pin-4: N/C
Pin-5: N/C
Pin-6: Adjust Return
Pin-7: Adjust
Pin-8: V out
Pin-9: Out Return
Pin-10: V Input Return
Pin-11: V Input
Pin-12: case

Case Styles

Part Number Designator Case Style Pin Count Mounting Step File
LF Case Style 7 12 Solder Sealed Flanged PCB Mount Download
ZF Case Style 9 12 Seam Weld Flanged Chassis Mount Download
PD Case Style 11 12 Solder Sealed PCB Stud Mount Download