I have a bad chip here, on a plug in switching walwart supply. the chip is bad, an 8 pin dip pwm chip. the chip munber is sd4844p. I have not found a source for the buyers to get one here. I found another small switcher with an 8 pin dip, number VIPer12. the chips are almost identical, with the same ratings and such, but with the supply and feedback pins reversed. why do mfgrs have to do that? especially when they dont have distributors around the world.
cliff
cliff