Abstract: An overheat protection circuit of a semiconductor apparatus has an output current detecting circuit for detecting an output current of a constant voltage circuit; a temperature detector for detecting a temperature of the apparatus; an output current control circuit for controlling the output current in accordance with output of the temperature detector; a bias current source for providing a bias current for the temperature detector; and a switch for controlling the bias current from the bias current source to the temperature detector. The output current control circuit interrupts the output current when the temperature detector detects a temperature that is higher than a predetermined temperature. The output current detecting circuit and the output current control circuit may be used to control the switch to prevent oscillation of the output current in the vicinity of the predetermined temperature.

Abstract: An over-current protection circuit for use with a constant voltage circuit that converts an input voltage to a predetermined output voltage and that outputs the predetermined output voltage.

Abstract: An over-current protection circuit for use with a constant voltage circuit that converts an input voltage to a predetermined output voltage and that outputs the predetermined output voltage.

Abstract: An overheat protection circuit of a semiconductor apparatus has an output current detecting circuit for detecting an output current of a constant voltage circuit; a temperature detector for detecting a temperature of the apparatus; an output current control circuit for controlling the output current in accordance with output of the temperature detector; a bias current source for providing a bias current for the temperature detector; and a switch for controlling the bias current from the bias current source to the temperature detector. The output current control circuit interrupts the output current when the temperature detector detects a temperature that is higher than a predetermined temperature. The output current detecting circuit and the output current control circuit may be used to control the switch to prevent oscillation of the output current in the vicinity of the predetermined temperature.

Abstract: A semiconductor device comprises a high-breakdown-voltage regulator (11) configured to operate at a high input voltage (V1); a reference voltage generating circuit structured as a low-breakdown-voltage component and configured to receive an output voltage from the high-breakdown-voltage regulator to generate a reference voltage VREF2; a differential amplifier circuit (M5) structured as a low-breakdown-voltage component and configured to receive the output voltage from the high-breakdown-voltage regulator and the reference voltage from the reference voltage generating circuit to produce a drive voltage; an output driver (M6) structured as a high-breakdown-voltage component and configured to operate based on the drive voltage; and resistors (R3 and R4) connected in series to the output driver to divide an output voltage of the output driver and feed the divided voltage back to the differential amplifier circuit.