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Home › Magazines › 2009 › July/August › Low-drop Series Regulator using a TL431

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Low-drop Series Regulator using a TL431

Published in issue 391, July/August 2009

A simple way of charging 12 V lead-acid batteries is to hook up a small unregulated 15 V 'wall wart' power supply. This can easily lead to overcharging, though, because the off-load voltage is really too high. The remedy is a small but precise series regulator using just six components, which is connected directly between the power pack and the battery and doesn't need any heatsink.

Relevant websites

http://focus.ti.com/lit/ds/symlink/tl431.pdf

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Magazine July/August 2009
UK391 (US $ 11.30)
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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