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cheapo 24 -> 12V dc-dc converters

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Colyn Case

Joined: 12 Oct 2009
Posts: 13
Location: Thetford Center

Posted: Thu May 28, 2020 8:07 am Post subject: cheapo 24 -> 12V dc-dc converters

I have a 28V aircraft with a few critical items that run on 12V.   I previously used a Vicor VI-M11-ES but it became damaged and that model is no longer available.



What Vicor has available are mini-packs which require building up your own circuit board and heat sinks.   cost is $400 and several days of work for me.



So I found this thing on the net.   data sheet attached.   for $22.  Includes heatsink, leads etc.    The worst thing I could find about it is .140V ripple.   but that beats the Vicor spec.



Any reason I shouldn't just use this thing?

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daygreen 24V to 12V 20A 240W.pdf

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Colyn Case
colyncase@earthlink.net

user9253

Joined: 28 Mar 2008
Posts: 1924
Location: Riley TWP Michigan

Posted: Thu May 28, 2020 9:32 am Post subject: Re: cheapo 24 -> 12V dc-dc converters

You might also consider a converter with 13.8 volt output which is closer to an aircraft

electrical system voltage with the alternator operating.

https://www.daygreen.com/collections/24v-to-12v-13-8v/products/24v-to-13-8v-20a-276w-dc-dc-step-down-converter-voltage-regulator

The AC ripple from an alternator is probably worse than a converter.

eBay has one for $17.50, free shipping from CA  eBay item number:332791865341

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Joe Gores

Colyn Case

Joined: 12 Oct 2009
Posts: 13
Location: Thetford Center

Posted: Thu May 28, 2020 1:35 pm Post subject: Re: cheapo 24 -> 12V dc-dc converters

Joe, thanks for the link.



In this case I actually do want 12V but interesting to get another data point on day-green.

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Colyn Case
colyncase@earthlink.net

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