| 摘要 |
An excess current detecting circuit (14) detects an excess current status of a power MOS transistor (2), which outputs a current to a load (6) from a drain electrode, and outputs the excess current detecting signal. The excess current detecting circuit is provided with a detection MOS transistor (3) wherein a source electrode and a gate electrode are connected to a source electrode and a gate electrode of the power MOS transistor (2), respectively, a constant current circuit (4) connected with a drain electrode of the detection MOS transistor (3) for flowing a prescribed constant current to the detection MOS transistor (3), and a comparator (5) for outputting the excess current detection signal based on the results of the comparison between a potential of the drain electrode of the power MOS transistor (2) and a potential of the drain electrode of the detection MOS transistor (3). ® KIPO & WIPO 2007
|
