Patent ID: 8693155
Filing Date: 2014-04-08
Classification: G05F,H02H

Abstract:
1. A constant voltage power supply circuit comprising: an output voltage dependent over-current protection circuit unit, wherein the output voltage dependent over-current protection circuit unit reduces, when an output current which is output from an output terminal of an output control transistor exceeds a first set value which is determined in advance, the output current from the first set value in a manner dependent on a reduction of an output voltage which is output from the output terminal; and a drooping over-current protection circuit unit, wherein the drooping over-current protection circuit unit detects, with an external resistor, the output current which is output from the output terminal of the output control transistor, and wherein the drooping over-current protection circuit unit reduces, when the detected output current exceeds a second set value which is determined in advance and which has a lower value than the first set value, the output voltage while maintaining the output current at the second set value.