公开(公告)号：EP3389187A1

公开(公告)日：2018-10-17

申请号：EP18165941.8

申请日：2018-04-05

Applicant: STMicroelectronics S.r.l.

Inventor： TERENZI, Marco ,  GHISU, Davide Ugo

IPC: H03K19/003

CPC classification number: H03K17/0822 ,  B06B1/0253 ,  B06B2201/76 ,  H03K19/00315

Abstract: A high voltage driving circuit (20, 40) for driving a load (23), configured to receive a low voltage input signal (LVIN; DINP, DINM) and to generate a high voltage output signal (HVOUT), comprising a short circuit protection circuit (30).
Such a short circuit protection circuit (30) comprises a first electronic switch (32) operated by the low voltage input signal (LVIN; DINP, DINM), and a second electronic switch (36) operated by a low voltage signal (LVOUT) obtained by applying a voltage division (24; 47) to the output high voltage signal (HVOUT),
said first electronic switch (32) causing a first pull-up current (M*I 1 ) to be sent to a capacitive element (CL) whose voltage controls the input of a threshold comparator (37),
said second electronic switch (36) causing a second pull-down current (k*N*I 2 ) to be drawn from said capacitive element (CL) whose voltage controls the input of said threshold comparator (37),
a short circuit detection signal (SCF) being picked up at the output of said threshold comparator (37), indicating said short circuit and capable of inhibiting the operation of said electronic driving circuit (20, 40).