| 摘要 |
A load actuation circuit is provided which is capable of placing a limit on load current to a load below a predetermined value with high accuracy. In the load actuation circuit, a series circuit comprising a detection transistor and an NPN transistor is connected in parallel with an output transistor for supplying a load current to the load, and a diode is placed between the gates of the output transistor and the detection transistor for producing a voltage drop equal to a voltage drop in the NPN transistor. In addition, a constant-current circuit for supplying a constant current is connected to the gate of the detection transistor, and another transistor for constituting a current mirror circuit together with the NPN transistor is connected to the gate of the output transistor. This circuit arrangement prevents a limit value of the load current from fluctuating due to the non-uniformity of circuit elements or the like, thus achieving high-accuracy load-current limitation.
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