I've been working on a 12 to 5 volt buck converter designed to charge mobile devices and I've run into a bit of a snag. The current output of the converter is usually about 2 milliamps. The voltage is around 5 volts and the phone says that it is charging. I have a zener stabilizer on the converter's output, but no current is going through it. I'll post a picture of the circuit in a few minutes. Thanks.