[sdiy] switched mode PSU design

[David J. Hughes]

Folks,

Thanks to everyone for their advice.

I should have explained a bit more in my original mail.

The PSU is to power a device which fits inside a large format wallwart case.
It needs to accept 100-300 VAC and reduce down to 9v DC, around 100mA.
We've been using the Philip's StarPlug chip for the current run but these
have some production issues which mean we want to look for alternatives.

on 10/8/05 9:39 am, Steve Lenham at lenham at clara.co.uk wrote:

> Try the "Topswitch" family of ICs (available from Farnell - just search for
> "topswitch" on their website). They contain pretty much an entire off-line
> switching PSU on one chip, in DIL8/TO220 etc. depending on power rating.

Thanks. This sounds ideal.

> The difficulty with any off-line design is likely to be in sourcing the
> correct high-frequency transformer - they don't tend to be available
> "off-the-shelf". If you find a good source in small quantities then I'd be
> interested to hear about it.

Yes, there's a local company (North-East England) who wind this for us. I'll
see if I can find the contact details.
 
> Obviously there are increasing numbers of ready-made switchmode wallwarts
> commercially available, but I'm assuming you want something a bit
> non-standard - dual rails, perhaps?

It's a fairly standard requirement driving a fairly non-standard device!

Cheers guys,
    David

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Infection Music Limited.                     http://www.infectionmusic.co.uk

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