UC3871N

UC3841Q Description
The UC3841Q family of PWM controllers has been designed to increase the level of versatility while retaining all of the performance features of the earlier  UC3841Q devices. While still optimized for highly-efficient bootstrapped primary-side operation in forward or flyback power converters, the UC3841Q is equally adept in implementing both low and high voltage input DC to DC converters. Important performance features include a low-current starting circuit, linear feed-forward for constant volt-second operation, and compatibility with either voltage or current mode topologies. UC3841Q
Features
• All Control, Driving, Monitoring, and Protection Functions Included
• Low-current, Off-line Start Circuit
• Voltage Feed Forward or Current Mode Control
• Guaranteed Duty Cycle Clamp
• PWM Latch for Single Pulse per Period
• Pulse-by-Pulse Current Limiting PlusShutdown 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
• PWM Output Switch Usable to 1A Peak Current
• 1% Reference Accuracy
• 500kHz Operation
• 18 Pin DIL Package UC3841Q Applications
• Automotive Equipment
• Digital control
• Optical networking
• Video & Imaging
• Wireless equipment