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3847

30 Watt Proton Rad Hard 100K+ DC-DC Booster Converter

Features

  • RadHard TID >100kRad(Si)
  • 2:1 Margin: Operates beyond 200kRad TID
  • No SEE: LET > 82meV*cm^2/mg
  • Power on soft start
  • Fully hermetic package

Specifications

  • Input: 12 VDC to VDC
  • Input Range (Continuous): 9 VDC to 20 VDC
  • Input Range (Full Power): 8 VDC to 20 VDC
  • Isolation Input to Case: 500 VDC to VDC
  • Isolation Output to Case: 100 VDC to VDC
  • Storage Temp: -65 to +150
  • Shock: 50 to
  • Acceleration: 500 to
  • Vibration: 30 to
  • Weight: 60 to

Environment

    • 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 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 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 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

    • 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

Additional Notes

The 3847 is a Rad Hard non-isolated Booster with a 9VDC to 20 VDC input and a 28VDC output with 30W capability. Model 3847 is a modern GaN design specifically for cubesat, commercial space and traditional space applications. It features high efficiency and short circuit protection, packaged in a 1.35″ by 2.2″ flanged case.

Unlike simple DC-DC boosters which allow unlimited current when the output voltage is less than the input voltage, Model 3847 contains an internal FET that opens the input/output connection when the output voltage is less than the input voltage. This feature no only provides short circuit protection but also allows the output to be inhibited when commanded.

Single Output Devices

Parameters Conditions 3847-S28 (30W)
MIN TYP MAX
Output set voltage — 27.8 28 28.2
Output current Vin min — Vin max — — 1.0A
Efficiency Pout = max rated load 89 92 —
Line regulation Pout = max rated load
Vin min — Vin max		 — 50mV 250mV
Load regulation Pout = 10% to F.L. — 50 mV 250mV
Output ripple F.L. BW 2 MHz
mVpp		 — 150 350
Input Current (@12V) Inhibited — 37mA —

Pinout Table

3847
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 Output
Pin-9: Output 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
2 Case Style 2 12 Solder Sealed Flangelss PCB Mount —
F – 10 Pin Case Style 3 10 Solder Sealed Flanged PCB Mount View PDF
I Case Style 5 12 Seam Weld Flangeless PCB Mount View PDF
IF Case Style 6 12 Seam Weld Flanged PCB Mount View PDF
WF Case Style 8 12 Seam Weld Flanged Chassis Mount View PDF
PB Case Style 10 12 Solder Sealed PCB Stud Mount View PDF
PE Case Style 12 12 Seam Weld Stud PCM Mount View PDF