Re: Auto switching power supply between USB power and external supply
- From: Rich Grise <richgrise@xxxxxxxxxxx>
- Date: Tue, 26 Apr 2005 21:39:14 GMT
On Tue, 26 Apr 2005 08:24:37 -0700, ganeshokade wrote:
> Dear Friends,
> We are on to designing a communication board based on the NEC V850
> microcontroller that will have a USB port for communicating with a PC.
> The board requires a supply voltage of 5V and draws at the most 300 ma
> of current. We want to design the board to use two sources of supply -
> one is from an external power supply if available and the other is from
> the USB port. Power should be drawn from the USB port only if the
> external power supply is not present. The circuit should be able to
> sense this automatically. We have some ideas but each of them has one
> or the other hurdle.
>
> 1) Use a connector for connecting the external power supply which will
> mechanically disconnect the USB ports supply voltage when plugged in.
> We are looking for a connector assembly (similar to the circular ones
> present on most cell phones) that can do this job. The catch here is we
> do not know a source. If we get to know a source, this is the most
> acceptable option.
http://dkc3.digikey.com/PDF/T051/0273-0277.pdf
Cheers!
Rich
.
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