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cheapo 24 -> 12V dc-dc converters

 
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PostPosted: Thu May 28, 2020 9:02 am    Post subject: cheapo 24 -> 12V dc-dc converters Reply with quote

One thing to watch out for is that this is a switching power supply. You can tell because it claims "High efficiency up to 95%". A linear converter would convert half of the energy into heat. Although switching regulators are everywhere these days, some are RF noisy, so you may hear noise on your radio.

Rob

On 5/28/2020 6:07 PM, Colyn Case wrote:

Quote:
Quote:
--> AeroElectric-List message posted by: "Colyn Case" <colyncase(at)earthlink.net> (colyncase(at)earthlink.net)

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?

--------
Colyn Case
colyncase(at)earthlink.net (colyncase(at)earthlink.net)


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http://forums.matronics.com/viewtopic.php?p=496547#496547


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nuckolls.bob(at)aeroelect
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PostPosted: Fri May 29, 2020 5:36 am    Post subject: cheapo 24 -> 12V dc-dc converters Reply with quote

At 11:07 AM 5/28/2020, you wrote:
Quote:
--> AeroElectric-List message posted by: "Colyn Case" <colyncase(at)earthlink.net>

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?\

Not at all . . . the ripple value is of no
consequence given that the ripple values
on the operating DC bus of an airplane are
on the order of 2500 mV pk-pk.

If you have any difficulties with this
device it will be interference with receivers
in the a/c due to radiated and conducted noise
in the radio frequency ranges . . . small
chance but not zero and easy to spot if they
do occur.




Bob . . .


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