公开(公告)号：US11264977B1

公开(公告)日：2022-03-01

申请号：US17184409

申请日：2021-02-24

Applicant: SYNAPTICS INCORPORATED

Inventor： Jae Won Choi ,  Dan Shen ,  Balakishan Challa ,  Lorenzo Crespi ,  Ketan Patel

IPC: H03K5/1536 ,  G01R19/175 ,  H02M1/08 ,  H02M1/00

Abstract: Embodiments described herein provide a zero-crossing detector (ZCD) for a direct current to direct current (DC-DC) converter. The ZCD includes a ZCD integrator configured to receive a switch voltage and an output voltage of a power stage of the DC-DC converter and to generate a zero-crossing detect signal based, at least in part, on the received switch voltage and output voltage, where the zero-crossing detect signal is configured to indicate an output current in an output inductor of the power stage of the DC-DC converter is approximately zero. The ZCD may also include a ZCD offset calibrator configured to receive the switch voltage and generate a ZCD calibration offset based, at least in part, on the received switch voltage, where the ZCD integrator is configured to generate the zero-crossing detect signal based, at least in part, on the ZCD calibration offset.