[chbot] More Li-Ion charger info

[Mark Atherton]

Yup, its 5V Li Ion charger, battery protection, and boost reg back up to 5V

first IC (TP4057, SOT23-6) is a Li Ion charger

second IC (DW01) Li Ion single cell protection

third IC (BL8530, SOT-89) is boot regulator to 5v

data sheets are here: http://www.idesignz.org/liion/data.zip

-mark




At 05:05 p.m. 20/05/2013, you wrote:
>Mark
>Are you sure its actually a charger, and not something to provide 5v 
>to a USB device from another battery or 5v source?
>
>    *Application:*
>
>    1.      You can DIY your mobile battery box for various equipment
>
>    2.      Add USB connector for 5V output ie. Mobile, MP3 and MP4 etc.
>
>    3.      Simple battery box for LED light, ie. Bicycle generator
>
>
>The schematic here shows the TP4057 used to charge a battery, as 
>intended. (although its the other package)
>http://www.tpmicro.com/goods.php?id=48
>
>There is a 12 page pdf here
>http://www.ecranic.com/files/TP4057.pdf
>(Bad luck Volker its in Japanese, but Google translate at least does 
>some of it.)
>
>I suspect they are using the DW01 simply to limit the battery 
>current (and shut off at low voltage?).
>
>The application of the BL8530 which is a booster, tends to reinforce 
>this, since a charger only wouldn't need it.
>
>
>Mark
>
>
>
>
>Mark Atherton wrote:
>>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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>>
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