公开(公告)号：US20240146195A1

公开(公告)日：2024-05-02

申请号：US17979156

申请日：2022-11-02

Applicant: STMicroelectronics S.r.l.

Inventor： Marco ATTANASIO ,  Giovanni BELLOTTI

IPC: H02M3/158 ,  H02M1/08

CPC classification number: H02M3/1582 ,  H02M1/08

Abstract: Disclosed herein is a DC-DC converter including a power section and a bootstrap circuit for driving the gate of the high-side transistor of the power section. The bootstrap circuit includes an adaptive clamp circuit that maintains a proper voltage differential across the bootstrap capacitor within the bootstrap circuit for recharge during off-times regardless of whether the mode of operation of the DC-DC converter continuous conduction mode (CCM), discontinuous conduction mode (DCM), or pulse-skip mode. This voltage differential is established as being between a bootstrap voltage and a voltage at a tap between the high and low side transistors of the power section. The adaptive clamp circuit maintains the bootstrap voltage as following the lesser of the output voltage and the voltage at the tap.