公开(公告)号：US11139811B2

公开(公告)日：2021-10-05

申请号：US16854518

申请日：2020-04-21

Applicant: STMicroelectronics S.r.l.

Inventor： Giancarlo Ragone ,  Vanni Poletto

IPC: H03K17/08 ,  H03K17/082 ,  B60R21/017 ,  B60R21/01 ,  H03F3/45

Abstract: A drive circuit for airbag systems, for instance includes a differential transconductance amplifier having a first input node, a second input node, an output node coupled to the second input node via a feedback line; a transistor coupled between a drive node and a supply node configured to be coupled to a power supply source; a control node coupled to the control electrode of the transistor and the output node; a Zener diode arrangement having cathode and anode terminals coupled to the supply node and the first input node, respectively; a pull-up component arranged in parallel with the Zener diode arrangement; and an enable switch coupled to the first input node and referred to ground and switchable between a conductive state and a non-conductive state with the differential transconductance amplifier providing controlled current discharging/charging of the control node to make the transistor conductive/non-conductive, respectively.