Automotive Circuit Protection

Peter D. Hipson mail at darkstar.mv.com
Wed Oct 11 21:34:06 GMT 2000


If you are worried about voltage drop on the diode then wire the diode
across the input *after* teh fuse (or better, circuit breaker). THen a
cross connect will blow the fuse instead.

At 07:38 PM 10/10/2000 -0400, you wrote:
>Nic van der Walt wrote:
>> 5KP is plenty.
>
>Great.
>
>> You need a reverse polarity diode after the fuse, before the TVS. Even
>> a 1N4007 would suffice, although I prefer SMS2100's.
>
>I can see why the reverse polarity diode is a good idea, but I was
>hesitant to add another diode drop in the power supply.  Under cranking
>conditions, the battery voltage might drop pretty low.  Since the 2940
>is an LDO regulator, things will probably be fine for a 5V supply.  I
>need an 8V supply for one application, and that might prove to be a
>problem.  I think you're right, though, so I'll put the diode in there. 
>I can't find any information (or sources for) the SMS2100.  What's
>better about it?  Any links or equivalent part numbers?

Thanks, 
        Peter Hipson (founder, NEHOG)
        1995 White NA Hummer Wagon
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