| 摘要 |
An over-current detecting circuit (OCD Circuit) for comparing a voltage drop by an ON-state resistance of an output transistor with a reference voltage, to detect an over-current state of the output transistor. This OCD Circuit is provided with a first power source and an RVG Circuit, which outputs a first reference voltage on the basis of a voltage supplied from the first power source. The OCD Circuit is also provided with a constant-current source which generates a constant current having a second temperature characteristic on the basis of the first reference voltage, and a current mirror circuit which inputs the constant current. Moreover, the OCD Circuit is provided with a current-voltage converting circuit, which converts an output current from the current mirror circuit, to a voltage and outputs a reference voltage which has a temperature characteristic in proportion to the second temperature characteristic. A first temperature characteristic of the output transistor is compensated by the temperature characteristic of the reference voltage.
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