Patent ID: 8599581
Filing Date: 2013-12-03
Classification: H02M

Abstract:
1. A primary-side regulated PFM controller comprising: a CS comparator for receiving an input voltage from an emitter of a primary switch via a positive input and a peak current reference voltage via a negative input, and outputting a PFM control signal based on the input voltage and the peak current reference voltage via an output; a PFM control module for turning off the primary switch based on the PFM control signal; a feedback error amplifier for receiving a primary-side sample voltage via a first input and an error reference voltage via a second input, and outputting an error amplifying signal via an output, during an off time of the primary switch; a CV control module, setting the off time of the primary switch based on the error amplifying signal; and a reference voltage generating module for generating the peak current reference voltage and the error reference voltage based on the primary-side sample voltage, a first reference voltage and a second reference voltage.