May 1997 ML4819* Power Factor and PWM Controller “Combo” GENERAL DESCRIPTION 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 oscillator, synchronization of the two stages is inherent.
The outputs of the controller IC provide high current (1A peak) and high slew rate to quickly charge and discharge MOSFET gates.
Special care has been taken in the design of the ML4819 to increase system noise immunity.
The PFC section is of the peak current sensing b...

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