Patent ID: 8320087
Filing Date: 2012-11-27
Classification: H02H,H02M

Abstract:
1. A switching regulator control circuit comprising: an over current judgment circuit comparing a current sense signal with a current limit to generate an over current indication signal; a time comparison circuit comparing the over current indication signal with a clock signal to determine whether the current sense signal continuously reaches the current limit in a time period and generate an output short-circuit indication signal accordingly; and a timer receiving the over current indication signal and the output short-circuit indication signal, wherein when the output short-circuit indication signal does not indicate an output short-circuit condition, the timer counts a first time period, and when the output short-circuit indication signal indicates an output short-circuit condition, the timer counts a second time period shorter than the first time period, and the timer outputs an output short-circuit protection signal at the end of the second time period.