Patent ID: 11955880
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An overcurrent protection circuit comprising:
a low-pass filter configured to generate a smoothing voltage corresponding to a voltage across a lower transistor forming a half-bridge output stage of an inverting type switching power supply;
a sense transistor; and
a sense resistor,
wherein an overcurrent protection signal is generated based on the smoothing voltage,
wherein a first end of the sense transistor is connected to a first end of the lower transistor, and the sense transistor is turned on and off in synchronization with the lower transistor,
wherein the sense resistor is connected between a second end of the sense transistor and a second end of the lower transistor, and
wherein the low-pass filter generates the smoothing voltage by smoothing a node voltage appearing at a connection node between the sense transistor and the sense resistor.