Current-Mode PWM Controller, UC1843A-DIE



The UC1843A-DIE is a pin for pin compatible improved version of the UC1843-DIE. Providing the necessary features to control current-mode switched-mode power supplies.


  • Rad-Tolerant: 30 kRad (Si) TID(1)
  • Optimized for Offline and DC-to-DC Converters
  • Low Start-Up Current
  • Trimmed Oscillator Discharge Current
  • Automatic Feed Forward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Undervoltage Lockout With Hysteresis
  • Double-Pulse Suppression
  • High-Current Totem-Pole Output
  • Internally Trimmed Bandgap Reference
  • Low RO Error Amplifier

(1) Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad/sec. Radiation Lot Acceptance Testing is available - contact factory for details.

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Other qualified versions of UC1843A-DIE

Version Part Number Definition
Enhanced Product UC1843A-EP Supports Defense, Aerospace and Medical Applications
Space UC1843A-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application