SEMICONDUCTOR DEVICE

摘要

Two resistances having different temperature coefficients are connected in series between a plurality of output transistors which are provided in parallel, and the power supply. A difference between these resistance values of the two resistances changes according to a temperature change. The change of the difference in the resistance value is detected as a change of voltage and a control signal is generated. According to the control signal, a protection transistor operates to connect an input node, and an output node or the both of the input node and the output node to the ground. As a result, in case of the extraordinary generation, the current to be supplied to a rear stage is restrained.

主权项

1. A semiconductor device comprising:
a photo-coupler configured to optically transfer an electric signal; a drive logic circuit section connected with said photo-coupler and configured to generate a signal pair based on the transferred electric signal; a sensor circuit section configured to receive a power supply voltage and output a temperature dependent voltage group which changes based on a temperature change; an output circuit section configured to receive the temperature dependent voltage group, and output an output voltage obtained by amplifying the signal pair, from an output terminal; a control circuit section configured to receive the power supply voltage and generate a control signal group based on the temperature dependent voltage group; and a protection circuit section configured to stop the output of the output voltage from said output terminal based on the control signal group.