| 摘要 |
PROBLEM TO BE SOLVED: To provide a constant voltage circuit that is provided with a sensitive overcurrent protection circuit having trailing overcurrent protection characteristics and overcurrent protection characteristics of fold back characteristics only by adding a simple circuit.SOLUTION: A constant voltage circuit includes: a sense transistor that flows a sense current based on an output current flowing into an output transistor; a current split circuit that splits and outputs the sense current; a first current voltage conversion circuit that receives a first split current output from the current split circuit to generate a voltage; a second current voltage conversion circuit that receives a second split current output from the current split circuit to generate a voltage; and an output voltage detection circuit that controls the current split circuit so that the voltage of an output terminal becomes equal to the drain voltage of the sense transistor. The constant voltage circuit also includes an overcurrent protection circuit that detects an overcurrent flowing through an output transistor upon receiving a voltage generated in the first current voltage conversion circuit to control an output voltage and an output current. |
