Hi barrymossel, I soldered the DC-DC converter, inductor and capacitor to a small piece of stripboard. I took the 12V DC in from my power supply and 5V DC out to a female USB socket, the used a short USB lead to the Chromecast Audio. I can take a photo of the converter arrangement tonight if you like?
For the 12V to 5v converter (MEV3S1205SC) the datasheet suggests a 10μH inductor (11R103C) and a 4.7μF ceramic capacitor.
The capacitor and inductor are for output ripple reduction.
Its all described at the top of page 4 of the datasheet.
http://docs-europe.electrocomponents.com/webdocs/0da4/0900766b80da44ea.pdf
Hope this helps.
No problem, I'll do that this evening. It the meantime here's a link to my project page 😉
Grazor's Homepage
As I use a 4S LiPo I had to look for another converter. I hope this one will be sufficient: TMR 3-1211-HI | TRACOPOWER Isolated DC-DC Converter, Vin 9 → 18 V dc, Vout 5V dc, I/O isolation 3000V dc | TRACOPOWER
- 9-18V input
- 5V output
- 3000V isolation
It does mention an input filter though. How important is that? Or is that for specific uses only (they talk about some standards etc.).
I only used the capacitor and inductor with the Murata converter because the datasheet suggested to. However there is no such requirement in the datasheet for the Tracopower converter. So I think you are good to go 🙂
Here is the DC to DC converter with its inductor an capacitor.
Sorry to dig up on old thread but I am doing exactly this!
I'm a bit confused over the wiring of the capacitor and inductor. If I've read the data sheet correctly, for output ripple reduction (page 6), the capacitor should bridge the V+ out and V- out (pins 5 and 7), but from your image it "looks like" you have done this with the inductor. I don't suppose you have a pic of the underside?
I've tried running without the ripple reduction but I don't think the CCA likes it and keeps rebooting.
Hi Mike,
Sorry for the late reply, I was away on holiday last week. Does this help?
Cheers,
Graham.
Hi Mike,
Sorry for the late reply, I was away on holiday last week. Does this help?
Cheers,
Graham.
Hi Graham,
No worries, thank you for replying. That helps a lot thanks. I was about to return mine but I'll give it another shot.
Did you get your capacitor from RS too? Do you mind me asking which one. The only one I can find has to be bought in a pack of 10.
C430C475K3R5TA | KEMET 4.7?F Multilayer Ceramic Capacitor MLCC 30 V dc ±10% X7R Dielectric Max. Op. Temp. +125°C | KEMET
Many thanks
Mike
Hi Mike, Sorry I can't remember where I got the capacitors from. I checked my purchase history for RS and Farnells but neither go back far enough to show the capacitor purchase. I seem to remember having to purchase a pack of 10. I'll have a look in my parts bin tonight and see if I can get a part number of the capacitors I bought.
regards, Graham.
Hi Mike, Sorry again for late reply. Yes that does look like the one. Here is the packaging for the ones I got.
I got the pack of 10. If you haven't bought them yet PM me your address and I'll stick a couple in the post to you.
Cheers,
Graham.
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