| 摘要 |
PROBLEM TO BE SOLVED: To improve the accuracy of the level of overcurrent detection and to extend the detection range of a detected current by compensating the temperature characteristic of an output transistor with the temperature characteristic of a reference circuit. SOLUTION: A reference voltage for overcurrent detection is generated by converting a constant current which is an output of a constant current source circuit 6, consisting of a plurality of diodes connected in series into a voltage by a current voltage conversion circuit 8. The reference voltage has a temperature characteristic which is proportional to the temperature characteristic of the diodes, to compensate for the temperature characteristic of an on-resistance of an output transistor, and the detected current range can be extended because the reference voltage is independent of a voltage drop of the diodes.
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