reverse polarity protection

[simondid]

hey


so i'm looking a way to do some reverse polarity protection on my project dos adafruit carry any kinde off battery cercuit that dos this?

[zener]

The simplest solution is a diode rated to carry the max current you will have.

[adafruit_support_bill]

We carry the 1n4001 diodes which are good for up to 1A. https://www.adafruit.com/products/755

Higher rated diodes are available from suppliers such as Mouser or DigiKey.

[simondid]

so it's for a battery power project witch mens i'm traying to drop the power lose witch meens i wut prefere a setup with a p channel mosfet ore if i can find a diode with a low enuf voltage drop accros / heat

[zener]

Shottky diodes have a lower Vf. Not sure what P channel has to do with it.

[simondid]

you can do a reverse polarity protection with a p channel mosfet with properly the lowest loss you can get...

but can you recomend shotkey dioded with a super low loss at 200-250ma at 2.8 to 4.1 volt?

[zener]

To use a fet that way you have to turn it on and off at the proper time. That is generally done in synchronous rectification, but I suppose you could use it for reverse polarity protection, but I have never seen it done personally. The lowest loss shottky's are usually the biggest ones. You want the lowest Vf spec. I don't know any off the top of my head. You can do a parapetric search on DigiKey.

[adafruit_support_bill]

We use an AOD417 in the protection circuit for our motor and servo boards as below:

[simondid]

seems like a good chip for the end goal dos is made in a thru hole format?

[adafruit_support_bill]

I don't think so. I have only seen it in the surface-mount package.

But the pads are pretty large and it is fairly easy to solder for an SMT component.

[simondid]

to you think i cut fit int on a proto bord like this one http://www.ebay.com/itm/201485487273?_t ... EBIDX%3AIT

[adafruit_support_bill]

Yes, i think you can make it work on a board like that.