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When there is a negetive voltage exist on the output of ADP7142, it will not work.

Question asked by Jiangshen on Sep 19, 2015
Latest reply on Sep 22, 2015 by Jiangshen

Hello everyone,

     There is a problem when I use ADP7142. When I apply a negetive voltage below -0.5V, the LDO will not work. Once the voltage over than -0.5V, the output go back to normal as the curve I captured(the yellow one is a negetive voltage from a signal source in series with a 1k resistor).TEK00026.PNG

     Besides, I test the ADP7118 with the same condition, it prove to be the same. But when I test ADP123, it work normal.