[chbot] More Li-Ion charger info

[Mark Atherton]

Glad this thread is progressing.

Here is progress on the boards that came from eBay - 
<http://www.idesignz.org/liion/liion_chg0.jpg>http://www.idesignz.org/liion/liion_chg0.jpg 
and http://www.idesignz.org/liion/liion_chg1.jpg

The protection FETs have driven me nuts, the 8205S is also available 
in a 'reverse' package', which of course I had a data sheet for 
initially - so nothing made sense. I ended up putting the SOT23-6 on 
a board and measuring type - and it appears to be the correct type.

Still strange things through - 5k resistor between P+ and B+, 1k 
resistor and 100n cap swapped, wrong output inductor.

Hoping the output under-voltage failure was caused by replacing the 
battery with a PSU to do the measurement. A cell needs to be 
sacrificed (if necessary) to see if it really works.

Possible to drop charge current to 100mA by replacing 1k6 with 10k in 
the charger.

Possible to remove continuous 650uA battery leakage by putting a 
switch in series with it (!).

-Mark


At 03:16 p.m. 20/05/2013, you wrote:
>On Mon 20 May 2013 13:52:38 NZST +1200, Andrew Errington wrote:
>
> > It's basically a TP4056 on a board.
>
>As stated by others, the board would have the performance of the chip,
>which has a
>http://www.tpmicro.com/datasheet/TP4056Ver1.0_preview.pdf
>
>1-page datasheet in sometimes bad English which is so cr*ppy, it doesn't
>even say the chip's input voltage range, and the manufacturer doesn't
>link to it, you have to use a search to find it.
>The chip is N/A digikey, mouser, element14!
>
>The board is cheap though US$2.30, or 1.80 for 3 or 1.60 for 10.
>
>It's the fast option, but if I was doing something myself I'd probably
>use the Microchip part (MCP73831, MCP73811) because it has better specs,
>or the more expensive MAX1551 (would have to read up on the fine details
>to tell what the differences are).
>
>Volker
>
>--
>Volker Kuhlmann
>http://volker.dnsalias.net/     Please do not CC list postings to me.
>
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