I have a circuit(an Hbridge) that I run off my bench supply. It draws <
100ma(actually about 10ma on average) but when I hook up a battery it causes the ic's to fail ;/The bench supply is almost 12V while the battery is almost 13V(about 1V higher) the chips have a max rating of about 12.6 volts and the battery is just a few 100mV higher. (it was reading ~12.7V with no load)
In any case when hook the positive up it sparks but doesn't do it on the bench supply.
It makes no sense why the battery would do this as there is no direct short(although it could be a startup issue where the mosfets in the hbridge end up shorting momentarily which somehow destroys the POS IC's).
Basically I'm replacing the bench supply with the battery(a car battery) and it ruins the device yet works fine with the bench. (the bench is basically a LM317 regulator) As I said, the only thing that is different is the voltage being a little higher on the battery and barely going over the max voltage of the device(which I would imagine wouldn't cause a catastrophic failure).
Any ideas?