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UC2851 - PWM Controller

General Description

The UC1851 family of PWM controllers are optimized for offline primary side control.

These devices include a high current totem pole output stage and a toggle flip-flop for absolute 50% duty cycle limiting.

Key Features

  • All Control, Driving, Monitoring, and Protection Functions Included.
  • Low-Current Off Line Start Circuit.
  • Voltage Feed Forward or Current Mode Control.
  • High Current Totem Pole Output.
  • 50% Absolute Max Duty Cycle.
  • PWM Latch for Single Pulse Per Period.
  • Pulse-by-Pulse Current Limiting plus Shutdown for Over-Current Fault.
  • No Start-Up or Shutdown Transients.
  • Slow Turn-On Both Initially and After Fault Shutdown.

📥 Download Datasheet

Datasheet Details

Part number UC2851
Manufacturer UNITRODE
File Size 766.22 KB
Description PWM Controller
Datasheet download datasheet UC2851 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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Programmable, Off-Line, PWM Controller UC1851 UC2851 UC3851 FEATURES • All Control, Driving, Monitoring, and Protection Functions Included • Low-Current Off Line Start Circuit • Voltage Feed Forward or Current Mode Control • High Current Totem Pole Output • 50% Absolute Max Duty Cycle • PWM Latch for Single Pulse Per Period • Pulse-by-Pulse Current Limiting plus Shutdown for Over-Current Fault • No Start-Up or Shutdown Transients • Slow Turn-On Both Initially and After Fault Shutdown • Shutdown Upon Over or Under Voltage Sensing • Latch Off or Continuous Retry After Fault • 1% Reference Accuracy • 500kHz Operation • 18 Pin DIL or 20 Pin PLCC Package BLOCK DIAGRAM DESCRIPTION The UC1851 family of PWM controllers are optimized for offline primary side control.