Patent ID: 8248826
Filing Date: 2012-08-21
Classification: H02M

Abstract:
1. A primary-sensing flyback switching regulator, having a primary side generating a primary voltage magnetically coupled to a secondary side that generates a regulated output voltage on output terminals of the regulator, the primary side including a feedback control circuit that generates a feedback voltage representative of said output voltage, a logic flag for flagging demagnetization phases of said switching regulator and a control voltage that fixes the maximum current level that may circulate in the primary side of the regulator in function of the difference between a reference voltage and said feedback voltage, said feedback control circuit further comprises: a circuit for generating a signal representative of the ratio between the duration of a demagnetization phase and the respective switching period from signals in the primary side of the converter; an auxiliary block input with said control voltage and with said representative signal and adapted to adjust said difference between the reference voltage and the feedback voltage in order to compensate eventual voltage differences between the regulated output voltage and the voltage effectively provided to a load supplied by the regulator.