Automotive PSU

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Docara
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Automotive PSU

Postby Docara » Tue Jan 09, 2018 12:45 pm

Hello Everyone and Happy New Year,

It looks like I need to put a microcontroller into a marine (diesel automotive) environment.

Does anyone have any actual hands on experience with automotive PSU's and could give me some advice how to implement a reliable uP supply? Ideally I need 3.3V and 5V @1A max

What I have in place at the moment is not the usual configuration but a dual battery bank setup with latching power relays to disconnect, isolate or bridge the banks as the charge level dictates, so I foresee some nasty switching spikes floating around.

My initial thoughts were to use suitable TVS's and some inductors feeding a linear power supply (automotive grade 7805 or similar). Looking around the net I found this LTC3895 http://cds.linear.com/docs/en/article/P385_EN-Surge_Suppression.pdf (which looks great) which addresses all my concerns but I don't have the PCB board making facilities or soldering capabilities to do the under-chip soldering required - I have Veroboard and that's it.

Thanks
MAtt

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Steve001
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Re: Automotive PSU

Postby Steve001 » Tue Jan 09, 2018 1:54 pm

Hi Matt

What's the input voltage ?

We use DCDC convertors at work for a lot of our products Both standard and railway spec (these are more expensive but have more filtering)

have a look at traco or xp power

https://www.tracopower.com/products/browse-by-category/category/dc-dc-converters/

https://www.xppower.com/Products/DC-DC-Converters/Through-Hole-Mount

this is not a bad device

https://www.tracopower.com/products/ten8wi.pdf


Hope this helps

Steve
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Re: Automotive PSU

Postby Docara » Tue Jan 09, 2018 2:19 pm

He Steve,

Good to here from you again.

Yeah 12Vdc nominal and I think 14.4Vcd charge possibly upto 15.2V - (I cant remember if AGM's have a maintenance de-sulphuring 15.2Vdc type cycle)

I will have a look at the links now

Matt