| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply circuit for stopping operation even if abnormal current of lower than a threshold value of a battery protective circuit runs through a power amplifier directly connected to a battery output. SOLUTION: A voltage monitor part 108a monitors the voltages of an output terminal of a negative voltage generation part 103 and a drain terminal and a source terminal of an FET1 109a. A determination part 108b determines the presence of abnormal current smaller than the threshold value of a working current of a protective circuit 107a from the monitored result. The determination part 108b, after determining the presence of the abnormal current, outputs a gate signal to FET2 109b. The FET2 109b shorts the protective circuit 107a, so that the protective circuit 107a operates. COPYRIGHT: (C)2005,JPO&NCIPI
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