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Circuits designed by David Johnson,
P.E.
Last Updated on:
Sunday, December 31, 2017 04:37 AM
Master Category List - Dave's Circuits
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Line Power Miniature 5v Line Powered
Isolated Supply July 20, 2009 Often a circuit
requires a 5v DC supply to power some logic circuits. The conventional
method is to use an AC wall adapter. But, many systems, which bring AC power
onto a circuit board, need a small AC to DC power supply right on the circuit
board. The circuit below provides such a supply. It uses a classic
series capacitor charge pump which acts as a current limiting device.
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full wave rectifier, a filter capacitor and a zener diode provide an off-the-shelf
isolated DC to DC converter with a 24v DC input. The miniature converter from
CUI generates a regulated +5v output, rated at 100ma. By doubling the size of
the capacitor C1 the circuit can be pushed to produce 200ma of output current.
Also, the same front end circuit can be used with other CUI converters. They
sell 3.3v, 12v and 15v supplies as well as the 5v unit shown. |
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Click on Drawing Below to view PDF version of Schematic |
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