[TowerTalk] 12V transient/noise filtering?

[Doug Ronald]

 It seems like a Maxim MAX16171 would fit the bill. It handles an input protection range of -42 through +76 V, and with an external FET, any reasonable current you need. I didn't look into an application board, but Maxim usually has those for its products. Even if you rolled your own, there are only a few components needed...
-Doug, W6DSR

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Lux, Jim
Sent: Thursday, May 13, 2021 13:29
To: towertalk at contesting.com
Subject: Re: [TowerTalk] 12V transient/noise filtering?

On 5/13/21 10:42 AM, Jim Brown wrote:
> On 5/12/2021 7:39 PM, Michael Tope wrote:
>> You would have to dive into the EMI/EMC specs provided in the 
>> datasheet - in particular conducted susceptibility
>
> In my experience, most EMI is common mode, and is not accurately 
> described on data sheets. 


but here, I'm not looking at EMI - I'm concerned about differential mode 
transients (inductive things like relay coils, etc.) blowing up the 
other things in the circuit.  Things like having a USB interface - they 
tend not to like big transients, and I'd rather not blow up the laptop, 
or Raspberry Pi, etc.  Sure, they have some sort of voltage regulator 
that brings 12V down to 3.3 or 5V, but things like the venerable 7805 
have a 35V absolute max so that 50V transient will kill it.

A DC/DC converter like those from CUI might have a wide range input, but 
probably not 50V and they have no reverse protection.


Something like a reverse biased 20V Zener might actually solve my problems.


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