Automotive Circuit Protection

[Jeff Webb]

Nic van der Walt wrote:
> Temperature rating of the caps is a hotly debated issue. Is this an underhood
> or in-cab application? I have used the Nichicon PJ series will very good
> results, although you can go to PW if size is important.

I'd like to be able to put this under the hood.  I've been specing parts
good from -40 to +125C.
 
> If you use a National simple switcher or a Linear tech switcher all you
> need to do is use the recommended parts. If the caps are the right rating
> and big enough you will have no problems. The Nichicon PJ's are really good
> for use on switchers.

Okay, I'm looking into it.  The main thing is I'll need to find caps and
inductors good to 125C.  If you have any suggestions, let me know.  The
Nichicon PJ's look like they are good to +105C.  They have a BT series
that's good to +125C, but I haven't checked the ESR, etc. to see if they
will work with the switching supply.

> The problems people see with switchers are usually because they use scrap box
> caps, or terrible PCB layout. If you want I can look at the design and layout
> before you make a proto, if there are any problems that will make the switcher
> not work I should be able to spot it.

Thanks, I might take you up on that.

That's all for now,

Jeff Webb
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org