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LM317 Simple CC CV With TL431 For Battery Charging, Etc.

The common LM317 regulator can be configured as a constant-current (CC) or constant-voltage (CV) circuit. Both are often desired for such applications as battery charging.

Here is a circuit that does that with one LM317 and one TL431...
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Author
crutschow
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2,353
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5.00 star(s) 1 ratings

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Useful circuit but to make it more perfect and save some milliamps increase R3 120 ohm to 1K2 because 1mA is enough to keep the TL431 going.
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