Hi all, I'd like to help out some friends on an antique motorcycle forum that have a 6 volt regulator project. One of them built a regulator on perfboard and posted the schematic. It has a couple of things I'd tweak, but it works. The main challenge: his regulator design doesn't incorporate current limiting. Even the original relay-style mechanical regulators incorporated current limiting, because the generators required it. Somebody on the forum suggested the zxct1009, but it only comes in surface mount which means we can't rejigger the existing perfboard project to include the new chip. It would mean having a custom- printed circuit board, and soldering techniques perhaps a little too demanding for somebody building his first circuit -- which probably describes a lot of the guys on the forum. pdf of the circuit:I've tried to find a through-hole component that fits the bill, but can't seem to come up with anything just right. I saw the micrel MIC5021, but it supposedly operates on 12 volts and up. Now, perhaps they make that statement on the datasheet because the chip actually also has a voltage doubler and the high side drive needs that kind of voltage to turn on a mosfet, and it's possible the chip itself will actually run on a much lower voltage. But the datasheet doesn't say anything to this effect. Has anybody used the MIC5021 and know if it might actually turn on at say 5 volts or perhaps know of any other through hole chips for current sensing?
15 years ago