公开(公告)号：EP3503403B1

公开(公告)日：2020-12-02

申请号：EP18211715.0

申请日：2018-12-11

Applicant: STMicroelectronics S.r.l.

Inventor： ZAMPROGNO, Marco ,  TAJFAR, Alireza

IPC: H03K19/08 ,  H03K17/041

公开(公告)号：EP3758170A3

公开(公告)日：2021-04-21

申请号：EP20179464.1

申请日：2020-06-11

Applicant: STMicroelectronics S.r.l.

Inventor： ZAMPROGNO, Marco ,  TAJFAR, Alireza

IPC: H01S5/042 ,  H01S5/062 ,  H03K17/0814 ,  H03K17/10 ,  H01S5/068

Abstract: A circuit (20,20',20") includes a capacitance (Cvhv) coupled between a high voltage node (VHV) and ground, a laser diode (LD) having an anode coupled to the high voltage node (VHV) and a cathode coupled to an output node (OUT), and a current source (40) coupled between the output node (OUT) and ground. The current source (40) turns on based on assertion of a trigger signal and sinks current from the capacitance (Cvhv) to ground to thereby cause the laser diode (LD) to lase, and turns off based on deassertion of the trigger signal. A clamping circuit (22) is coupled between the output node (OUT) and the high voltage node (VHV), and clamps voltage at the output node (OUT) occurring when the current source (40) switches off.