Patent ID: 11955890
Assignee: RICHTEK TECHNOLOGY CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A driver circuit of a switching converter circuit, the driver circuit comprising:
a high side driver configured to operably generate a high side driving signal according to a pulse width modulation (PWM) signal, so as to drive a high side metal oxide semiconductor field effect transistor (MOSFET);
a low side driver configured to operably generate a low side driving signal according to the PWM signal, so as to drive a low side MOSFET;
a high side sensor circuit configured to operably sense a gate-source voltage of the high side MOSFET and generate a low side enable signal according to the gate-source voltage of the high side MOSFET, so as to indicate an OFF state of the high side MOSFET, wherein the low side enable signal enables the low side driver to switch the low side MOSFET according to the PWM signal; and
a low side sensor circuit configured to operably sense a gate-source voltage of the low side MOSFET and generate a high side enable signal according to the gate-source voltage of the low side MOSFET, so as to indicate an OFF state of the low side MOSFET, wherein the high side enable signal enables the high side driver to switch the high side MOSFET according to the PWM signal;
wherein the low side sensor circuit includes a low side sensor MOSFET having a conductivity type which is the same as the low side MOSFET, wherein a gate of the low side sensor MOSFET is coupled with a gate of the low side MOSFET, and a source of the low side sensor MOSFET is coupled with a source of the low side MOSFET, such that the low side sensor MOSFET generates the high side enable signal at a drain of the low side sensor MOSFET according to the gate-source voltage of the low side MOSFET.