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CAT # UDC-10 5 out of 5 stars(5 Reviews) Write a Review

$ 27.50
$27.50 each
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Product Description
• Up-down (Buck-Boost) voltage converter
• Input: 5-32 Vdc
• Output: 1-30 Vdc, continuously adjustable
• Output current: 7A continuous, 10A peak
• Output power: 80W continuous, 130W peak
• Output ripple: 50Mv
• 1.83" x 3.05" x 0.58"
WARNING: May cause cancer or reproductive harm.
California Prop. 65
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Customer Reviews 5 out of 5 stars(5 Reviews)

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More Info... 5 out of 5 stars

Reviewer: from Slayton, MN

From a similar unit on eBay, I was able to determine that the 3 pots are for adjusting Under Voltage, Constant Current, and Constant Voltage. It also apparently has a fuse on in the input (15A?)

13 of 13 people found this review helpful. Do you? Yes No  Certified buyer

Fault LED no biggie 5 out of 5 stars

Reviewer: from Maryland

Don't panic if you power this board up and get no output with the red FAULT LED lit. It comes on if 1) the input voltage turn-off threshold is too low (left pot), 2) the output current is "too high" [current limited?] or 3) the output is shorted.

The "normal" blue LED will come on as the output comes into regulation, though the red LED may still be on if you're right at the edge of the voltage threshold.

In my case 13.3V in was below the turn-off threshold. Dialed it back with the left pot until red off, blue on, adjusted my output voltage with the right pot, and gave the center current-limit pot a few clockwise turns until I can get my load connected.

There a PDF "datasheet translation" labeled on Google as "WD2002SJ (LTC3780) Voltage/Current regulator - GitHub".

12 of 12 people found this review helpful. Do you? Yes No  Certified buyer

Really nice 5 out of 5 stars

Reviewer: from El Paso, TX

The Suburban NT-16SE propane furnace in our RV, does not ignite when the battery voltage drops below 12.4 or thereabouts. This little converter, connected to the ingnitor board (not the blower motor) keeps it working when cold and low voltage. I set it to 12.9. It also fits nicely in a small project box from All Electronics.

8 of 8 people found this review helpful. Do you? Yes No  Certified buyer

More Specs 5 out of 5 stars

Reviewer: from Studio City, CA USA

Appears to be the same as ones labeled WD2002SJ. Here's a link to more info.

7 of 7 people found this review helpful. Do you? Yes No

Very useful, nice stable (VERY adjustable) output, nice job! 5 out of 5 stars

Reviewer: from Montgomery, AL, USA

I have not had any issues with excessive heat, am repeatedly surprised at how little heat this thing generates when in use.

Very versatile - the output current limit and output voltage limit functions work at the same time - you don't have to switch between CC and CV modes, just set the voltage and current and it behaves like you tell it to. There is also no toggling between boost/buck modes - input voltage could suddenly go from 12 to 24, or vice versa, with no affect on the output.

It seems to be short circuit protected, though I would be careful if the current limit is turned higher than a few amps - it apears to completely shut off input power when shorted.

You can set a low voltage cutoff, but this is optional since you can turn the cutoff voltage down to zero (to disable low voltage cutoff) or up to effectively turn it off by turning the cutoff all the way up.

I have been able to use this thing to charge 12V and 24V lithium batteries and to power a few different laptops with no problem. To charge a LiPo, set max output voltage with load disconnected, then use a dummy load to set current (or just use battery as the load like I usually do...careful though).

It is hard to say really even enough about these little boards but after a month I went ahead and 2nd one since it does so many different things. Great to use as a bench/lab power supply, battery charger, universal DC power supply, solar panel power converter.

I have not carefully measured the input and output simultaneously enough to give a number but I was not able to get this thing to waste more than a few watts when trying to figure out how efficient it was - enough info for me to not feel the need to study the thing and do the math at different input and output ratios....the thing is very nicely done all around. There is no documentation, there are no instructions, and there is also no $100 price tag. Instead, play around with it when you first get it, with an ammeter
and voltage display at the output - this thing is only $30 so if you really need documentation make your own. The current and voltage pots: CW to increase, CCW to decrease. The POT low voltage cutoff is the opposite if I am not mistaken.

Anyone interested enough to read this far needs to have one of these in their little "toy box", tool box, or both. Fits very nicely into a cigarette pack, as though it was designed for it. There is so little heat that the cig pack may be a good enclosure option if coated with liquid tape, epoxy etc.

I am wary of similar circuits to the point that I generally just won't buy them and I was wary of this one but not as much since it was being sold here... it seems to be fairly solid and performs amazingly well. On top of that these people ship the orders out pretty quickly - never had a negative experience with them.

2 of 2 people found this review helpful. Do you? Yes No  Certified buyer

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