OPTOISOLATED DC-DC
in [Design]
|
From: Johnny5 on 29 Apr 2010 10:37 Gentlemen, I was curious on any ideas of an opto dc-dc converter providing 20mA. Small footprint and heighth.. Any ideas? Please and Thank You. VIN-8-16VDC VOUT 5VDC 20mA,
From: hamilton on 29 Apr 2010 11:14 On 4/29/2010 8:37 AM, Johnny5 wrote: > Gentlemen, I was curious on any ideas of an opto dc-dc converter > providing 20mA. Small footprint and heighth.. > Any ideas? Please and Thank You. > > VIN-8-16VDC > VOUT 5VDC 20mA, > OPTO ??? what !! dc-dc converters are all transformer based. Digikey has 1W units with 5000V isolation, they work just fine. hamilton
From: John Larkin on 29 Apr 2010 11:42 On Thu, 29 Apr 2010 07:37:08 -0700 (PDT), Johnny5 <dirtylogicdesigns(a)gmail.com> wrote: >Gentlemen, I was curious on any ideas of an opto dc-dc converter >providing 20mA. Small footprint and heighth.. >Any ideas? Please and Thank You. > >VIN-8-16VDC > VOUT 5VDC 20mA, Do you mean LED to PV? The ones you can buy deliver ballpark 100 microwatts at insanely low efficiency. They can be very handy for things like slow fet gate drives, like making your own SSR. There are some serious laser+fiber+PV power delivery things, but they cost kilobucks. If a laser were 50% efficient and a PV was 15% and you lost 20% from optics, overall efficiency becomes 6%. And it would be hard to do that well. Little transformer-based potted dc/dc bricks start around $4. Murata and CUI make nice ones. They run around 85% efficient. I tested some of both recently and was impressed. There is of course my Groucho Marx generator circuit, which uses optoisolated SSRs to make a sort-of-isolated power coupler. It can do watts at high efficiency and is relatively quiet. John
From: Phil Allison on 29 Apr 2010 11:43 "Johnny5" <dirtylogicdesigns(a)gmail.com ** Google Monkey alert !! > Gentlemen, I was curious on any ideas of an opto dc-dc converter > providing 20mA. Small footprint and heighth.. > Any ideas? Please and Thank You. > > VIN-8-16VDC > VOUT 5VDC 20mA, ** Ever though of using solar cells and a 12 volt lamp ?? ..... Phil
From: John Larkin on 29 Apr 2010 12:17
On Fri, 30 Apr 2010 01:43:19 +1000, "Phil Allison" <phil_a(a)tpg.com.au> wrote: > >"Johnny5" <dirtylogicdesigns(a)gmail.com > > >** Google Monkey alert !! > > >> Gentlemen, I was curious on any ideas of an opto dc-dc converter >> providing 20mA. Small footprint and heighth.. >> Any ideas? Please and Thank You. >> >> VIN-8-16VDC >> VOUT 5VDC 20mA, > > >** Ever though of using solar cells and a 12 volt lamp ?? > > Done carefully, that might approach 1% efficiency. John |