Patent ID: 8054602
Filing Date: 2011-11-08
Classification: H03K

Abstract:
1. A power supply controller comprising: a semiconductor switching element disposed on a current supply line from a power source to a load; a current detecting element configured to detect a load current passing through said semiconductor switching element; a breaking anomaly detecting circuit configured to output a breaking anomaly signal if it is determined based on a detection signal from said current detecting element that a load current passing through said semiconductor switching element is lower than a breaking anomaly threshold while said semiconductor switching element is in an ON state; a threshold adjustment circuit configured to change said breaking anomaly threshold according to an output-side voltage of said semiconductor switching element; and a switch control circuit configured to turn on said semiconductor switching element based on an input of an ON signal; wherein said breaking anomaly detecting circuit includes a first filter circuit configured to suppress an output of said breaking anomaly signal until an elapsed time since an input of said ON signal reaches at least a first time.