Patent ID: 9716434
Date: 2017-07-25
CPC Classifications: H02M

Claim:
1. An apparatus, comprising: a) a power stage circuit comprising a first switch, an inductor, and a fourth switch coupled in series between input and output terminals, a second switch having a first terminal coupled to a common node of said first switch and said inductor, and a second terminal coupled to ground, a third switch having a first terminal coupled to a common node of said fourth switch and said inductor, and a second terminal coupled to ground; b) a constant time control circuit configured to generate a switch trigger signal according to switching signals of said first and third switches; c) a pulse-width modulation (PWM) control circuit configured to receive an input voltage signal via said input terminal, an output voltage via said output terminal, and said switch trigger signal, and to generate switching signals to control said first, second, third, and fourth switches; and d) said PWM control circuit being configured to turn on or off said first and third switches in response to said switch trigger signal being activated.