Patent ID: 8576529
Filing Date: 2013-11-05
Classification: H02H

Abstract:
1. A power stage control circuit controlling a power stage, wherein the power stage is driven by a driver signal to convert an input voltage to an output voltage or an output current, the power stage control circuit comprising: a driver circuit for generating the driver signal to drive the power stage according to an error amplified signal; an error amplifier circuit for comparing a feedback voltage at a feedback terminal with a reference signal to generate the error amplified signal, wherein the feedback terminal is for electrically connecting to the output voltage through a first resistor and electrically connecting to ground through a second resistor; a current generator circuit coupled to the feedback terminal for generating a fault detection current flowing out through the feedback terminal such that when the output voltage is zero or low, the first and second resistors form a parallel circuit between the feedback terminal and the ground; and a feedback terminal short detection circuit for generating a fault signal when, after the fault detection current is generated, the feedback voltage is smaller than a short-circuit threshold voltage, such that the driver circuit stops driving the power stage.