Texas Instruments UC2852N

Description
The controlled on-time, zero current switching technique provides a simple and efficient solution for obtaining high power factor correction. This discontinuous inductor current approach essentially programs a constant switch on-time during one line half-cycle. It does not require any "complex" analog square, multiply, and divide functions to control the instantaneous switch current as with other PFC techniques. Additionally, zero current switching limits the peak current to exactly twice that of the average inductor current over all line and load combinations. High efficiency operation is also achieved with no boost rectifier recovery concerns and power loss.

Features
High power factor correction
Simple and efficient solution
Discontinuous inductor current approach
Constant switch on-time during one line half-cycle
No "complex" analog square, multiply, and divide functions required
Zero current switching limits peak current to twice the average inductor current
High efficiency operation
No boost rectifier recovery concerns or power loss

Applications
Power factor correction in AC-DC power supplies
Industrial and commercial applications
Consumer electronics
Lighting systems