HEAT TRANSFER CUT-OFF CIRCUIT

摘要

The heat transfer cut-off circuit cuts off the transference of heat generated by abnormal operating or over-load in the semiconductor integrated circuit to protect the external load of the integrated circuit. The cut-off circuit compares the operating temperature with the circumferential temperature of the integrated circuit, and cuts off the thermal transference from the integrated circuit into the external load. A circumferential temperature detector (15) is set separately from a temperature detector of the output-transistor (17), which is adjacent to the output-transistor (Q5). The power is cut-off by the comparison of the output difference of the two detectors with a limited rising temperature (16).