公开(公告)号：EP3934097A1

公开(公告)日：2022-01-05

申请号：EP21179806.1

申请日：2021-06-16

Applicant: STMicroelectronics S.r.l.

Inventor： FONTANA, Marco Giovanni ,  RIVA, Marco ,  PULVIRENTI, Francesco ,  CANTONE, Giuseppe

IPC: H03K17/082 ,  H03K17/0812 ,  H03K17/06 ,  H02M1/00 ,  H02M1/08

Abstract: A circuit (HBD) comprises a first (100a) and a second (100b) input supply nodes configured to receive a supply voltage ( V CC ) therebetween. The circuit comprises a high-side driver circuit (12a) configured to be coupled to a high-side switch (HS) of a half-bridge circuit, the high-side driver circuit (12a) configured to produce a first output control signal between a first high-side output node (120a) and a second high-side output node (102a). The circuit comprises a low-side driver circuit (12b) configured to be coupled to a low-side switch (LS) of the half-bridge circuit, the low-side driver circuit (12b) configured to produce a second output control signal between a first low-side output node (120b) and a second low-side output node (102b). The circuit comprises a floating supply node (104) configured to receive a floating supply voltage ( V CB ) applied between the floating supply node (104) and the second high-side output node (102a) to power the high-side driver circuit (12a). The circuit comprises a bootstrap diode (D3) between the first input supply node (100a) and an intermediate supply node (106), and a current limiter circuit (Q1', Dl', 62) between the intermediate supply node (106) and the floating supply node (104). The current limiter circuit (Q1', Dl', 62) is configured to sense the floating supply voltage ( V CB ) and to counter a current flow from the intermediate supply node (106) to the floating supply node (104) as a result of the floating supply voltage ( V CB ) reaching a threshold value.