I have a circuit with a dc photovoltaic string of about 280 volts feeding into this. The circuit calls for a SM12 chip with I think 4 pins. I guessed it was a voltage regulator of some kind but all the googled datasheets give different devices and none seem to fit this .
Can anyone tell me what it would be and where I would get one?
Its marked Pin 1 is L, Pin 2 is N, Pin 3 is +12 v, Pin 4 is 0 v Just noticed in the notes he says " A small Chinese postage stamp sized 12v dc power supply provides power ." Could these two be the same thing .