公开(公告)号：US20240333280A1

公开(公告)日：2024-10-03

申请号：US18616703

申请日：2024-03-26

Applicant: ROHM CO., LTD.

Inventor： Suzunosuke KIMURA ,  Kosuke YASUJI ,  Hiroki SUGAMOTO

IPC: H03K17/30 ,  H02M3/07 ,  H03K17/041

CPC classification number: H03K17/302 ,  H02M3/07 ,  H03K17/04106 ,  H03K2217/0063 ,  H03K2217/0072

Abstract: The present disclosure provides a motor driver circuit. The motor driver circuit includes a high-side driver that drives a high-side transistor according to a control signal. The high-side driver includes a voltage monitoring circuit, a timer circuit and a charge pump circuit. The voltage monitoring circuit asserts a detection signal when a detection voltage of the high-side transistor becomes lower than a threshold value. The timer circuit starts measuring a predetermined time in response to the control signal changing to an on state that the high side transistor is instructed to turn on, or in response to an assertion of the detection signal when the control signal is in the on state. The charge pump circuit is active while the timer circuit measures the predetermined time, generates a boosted voltage in response to a clock signal and supplies the boosted voltage to a gate of the high-side transistor.

公开(公告)号：US20240333284A1

公开(公告)日：2024-10-03

申请号：US18616751

申请日：2024-03-26

Applicant: ROHM CO., LTD.

Inventor： Kosuke YASUJI ,  Suzunosuke KIMURA ,  Hiroki SUGAMOTO

IPC: H03K17/687 ,  H02M3/07

CPC classification number: H03K17/6871 ,  H02M3/07 ,  H03K2217/0063

Abstract: The present disclosure provides a motor driver circuit. The motor driver circuit includes: a logic circuit, configured to generate a control signal that instructs a high-side transistor to turn on or off; and a high-side driver, configured to drive the high-side transistor according to the control signal. The high-side driver includes: a charge pump circuit, configured to generate a boosted voltage according to a clock signal and supply the boosted voltage to a gate of the high-side transistor; a charging control circuit, configured to stop supplying the clock signal to the charge pump circuit after the control signal instructs the high-side transistor to turn on and after a charging period has elapsed; and a turn-off circuit, configured to reduce a voltage at the gate of the high-side transistor when the control signal instructs the high-side transistor to turn off.