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Thermal  runaway of LTC1871.

Question asked by LouisdB on Jul 20, 2018
Latest reply on Jul 23, 2018 by GPerica

Please see this circuit diagram attached. The input voltage on pin 9 is from a variable power supply. It does not matter what voltage is applied to pin 9, with a 500mA load, the input current will rise to about 1.5A and more, within 20 to 30sec. before I manually terminate the input voltage. The chip temperature is about 80deg C. What must I look for to fix this problem?

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