ML4819 Datasheet - Fairchild

ML4819 Power Factor and PWM Controller Combo

The ML4819 is a complete boost mode Power factor Controller (PFC) which also contains a PWM controller. The PFC circuit is similar to the ML4812 while the PWM controller can be used for current or voltage mode control for a second stage converter. Since the PWM and PFC circuits share the same oscill.

ML4819 Features

* s s s s s s s Large oscillator amplitude for better noise immunity Precision duty cycle limit for PWM section Current input gain modulator improves noise immunity Programmable Ramp Compensation circuit Over-Voltage comparator helps prevent output “runaway” BLOCK DIAGRAM 10 20 CT RAMP COMP SLOPE

ML4819_FairchildSemiconductor.pdf