I would love to use an unregulated supply but am being told I have to use a regulated
5V supply. Since I have no choice I need to see how best to protect the rest of the
unit against someone plugging in the wrong voltage.
At 09:49 AM 2/11/03 -0800, H.C. Croon wrote:
Hi Bob,-Bob
> I have a question about protecting a circuit from an overvoltage condition. We
> have a new device that we are planning to use a regulated 5V wall-wart type
> device for power. They have also requested overvoltage protection in case
> someone plugs in a 6V or 8V unregulated supply by accident. My expertise
> is mostly digital so I am not sure what the best and cheapest way to do this
> would be. Thanks in advance for any help or pointers.
With a regulated poweradaptor you have some more costs than with an
unregulated one. But you want extra electronics as a saveguard in
your device. And how about the costs if you use an unragulated supply
together with a voltage regulator/saveguard circuit? With a standard
regulator you are save upto 35V. The are shortcircuit resistant.
When you design a separate savequard circuit, you need a feedtrough
transistor loosing some voltage. Besides you must have some
protection circuitery. What will be the price. I think the former
solution is cheaper and will to more than you want.
Regards, Harry
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Robert Ritchey
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