Measurements on hung-low Belkin clone N10117-Z528 12V ->5V 1A car USB charger - Page 1
Forum section: electronics / general

author: DutchGert
author_rank: Frequent Contributor
timestamp: October 04, 2013, 07:57:39 am
content: This morning I did some ripple/noise measurements on a hung-low 12 to 5V 1A USB charger (+- $3 in China) for use in your car since it seems to be popular these days.It has written N10117-Z528 on it and seems to be a clone from a Belkin USB car charger (doesn't have Belkin printed on it)With 12V input and a 500mA to 1A load it actually seems to be preforming reasonably good (for a $3 DC-DC) but the almost 5.6V spikes at no load (ieg when your phone is fully charged) I don't like at all.---Update--I also did a quick teardown, soldering is bad as expected but overall the design seems reasonable. Ofcourse the used a MC34063A and even seem to use 105C 220uF caps on input and output. Brands unknown so how good they are, no idea.

author: djococaud
author_rank: Regular Contributor
timestamp: October 04, 2013, 10:13:18 am
content: I often try not to buy thing that has the wrong CE logo...Just in case !With my 300€ phone, i won't take the risk of damage it for 3$

author: DutchGert
author_rank: Frequent Contributor
timestamp: October 04, 2013, 10:33:09 am
content: Quote from: djococaud on October 04, 2013, 10:13:18 amI totally agree, not worth the risk at all but still, nice to see how the thing is designed and what it's performance is.

author: DutchGert
author_rank: Frequent Contributor
timestamp: October 04, 2013, 11:32:28 am
content: Quote from: mojo-chan on October 04, 2013, 10:52:26 amTrue, not bad at all. Addding an LDO is to much work right now, i'll just buy a proper one.I did try to (crudely) improve it by adding some decoupling at the output. It improved the signal a bit but that made it oscillate at >750mA. Now it's in the trash

author: dannyf
author_rank: Super Contributor
timestamp: October 04, 2013, 05:47:58 pm
content: QuoteThose things don't work that way.

author: DutchGert
author_rank: Frequent Contributor
timestamp: October 04, 2013, 07:09:54 pm
content: Quote from: dannyf on October 04, 2013, 05:47:58 pmI know, but there was high freq noise (not switching behaviour) on the lines a well.

author: Stonent
author_rank: Super Contributor
timestamp: October 04, 2013, 07:35:23 pm
content: Quote from: djococaud on October 04, 2013, 10:13:18 amThis charger cost the same as the last bottle of wine I bought!

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: October 04, 2013, 10:21:14 pm
content: Heres a good teardown of 13 different USB chargers .http://www.righto.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.htmlhttp://www.righto.com/2013/06/the-mili-universal-carwall-usb-charger.html

author: Branqazwsx
author_rank: Unknown
timestamp: October 06, 2013, 11:48:42 pm
content: Quote from: djococaud on October 04, 2013, 10:13:18 amI agree too. its just worth it to buy the quality chargers.

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: October 07, 2013, 03:34:17 pm
content: Quote from: mojo-chan on October 07, 2013, 08:44:25 amDid the packaging have a TUV mark ? Afaik lidl gear is generally quite good as everything has to pass german TUV testing.

author: DutchGert
author_rank: Frequent Contributor
timestamp: October 08, 2013, 01:36:03 pm
content: Quote from: fluxcapacitor on October 07, 2013, 03:34:17 pmThat's indeed a good thing to watch for, a genuine TUV sign on it.