Current limit protection scheme for PWM buck converter with synchronous rectifier

摘要: A embedded overcurrent protection circuit within the PWM feedback controller (30) of a power converter (100) having an novel current limit detection function that minimizes effects turn-on period device (14) is disclosed herein. This includes (10–20) reset on rising edge system clock in first step. In second step, turned on. another detecting detects drain-to-source voltage across and output generated thereby. sense (18) compares detected with predetermined value When less than value, step conducted where regulated by modulating pulse width signal sent driver (12) to control node (14). alternative, when exceeds off synchronous rectifier (16) while its monitored at monitoring enables minimize Finally, wherein this entire procedure continuous.