Al salaam a'alaykum Brenton

06 Nov 03 19:11, Brenton wrote to All:

 B> Sorry for replying so promptly to an on-topic message.  I hope I 
 B> didn't scare you and I promise I wont do it again :)

Didn't scare me at all.

 >> The power pack produces 6.3v DC at 3A.

 B> 'hokay.

 >> How hard would it be to produce a switch mode supply to produce
 >> that output, but from a (nominal) 12V DC supply?

 B> Not hard at all.

yes..... but.....

 B> I'd use something from the NatSemi simple-switcher line.

 B> All of these devices are rated for 3A and have adjustable output.

 B> LM2576 switches at 52khz, cost should be about $3.50 - $5.00

 B> LM2585 or LM2586 switch at 100khz, cost could be about $8.00 - $10.00

 B> LM2596 switches at about 150khz, cost could be about $4.00 - $5.00

I did some research on the Web, and it looks simple enough - but all the
maths for working out the component values went right over my head (I'm not
an electronics engineer like some).

Regards,
David

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