公开(公告)号：US20240265940A1

公开(公告)日：2024-08-08

申请号：US18417588

申请日：2024-01-19

Applicant: STMicroelectronics International N.V.

Inventor： Michele Boscolo Berto ,  Ezio Galbiati

IPC: G11B5/55 ,  G11B19/20 ,  H02P7/025

CPC classification number: G11B5/5569 ,  G11B19/2009 ,  H02P7/025

Abstract: Embodiments provide a method of operating a voice coil motor via a transconductance loop. The method includes detecting an actual value of a supply voltage of the transconductance loop. An offset compensation signal of the transconductance loop is produced as a function of the detected actual value of the supply voltage based on a relationship between offset values and the supply voltage of the transconductance loop. The offset compensation signal is applied to a loop control signal of the transconductance loop. A drive current is applied to the voice coil motor. The drive current is related to a target drive current that is based on the loop control signal.