Patent ID: 6839247

Claim:
A PFC-PWM controller having a power saving means comprising: an input voltage terminal; a PFC-feedback voltage terminal; a PWM-feedback voltage terminal; a first reference voltage terminal; a second reference voltage terminal; an input resistor; a detection pin connected to said input resistor; a current synthesizer for providing a bias current, wherein said current synthesizer has at least four inputs, wherein a first input is connected to said PWM-feedback voltage terminal, a second input is connected to said first reference voltage terminal, a third input is connected to said PFC-feedback voltage terminal, and a fourth input is connected to said second reference voltage terminal; an oscillator having an input for receiving said bias current, a first output for generating a pulse signal, and a second output for generating a first saw-tooth signal; a pulse-width limiter having a first input for receiving said pulse signal, a second input for receiving said first saw-tooth signal, and an output for generating a limit signal; a saw-wave generator for generating a second saw-tooth signal; and a current reference generator having an input connected to the input voltage terminal via said input resistor and an output for generating a template signal.