Lithium Ion Charge Circuit - RC Groups
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Jan 15, 2003, 07:13 PM
HobbyShopWorld.com

Lithium Ion Charge Circuit


I have built the charger using a LM350 and can get approx 3 amps on 2 cell setup. I know that the max current the LM350 can do is 3 amps. Can something be done to get more current out of this circuit? maybe double or tripple current?

www.shdesigns.org/lionchg.html



I want to charge large packs 9000mah and would like to charge at 1C AT LEAST.... Anyone?
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Jan 15, 2003, 08:03 PM
DNA
DNA
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Regulator LM338 is good for 5 amps with heat sink.

Using two in parallel would give you 10 amps.

http://www.national.com/pf/LM/LM338.html
Last edited by DNA; Jan 15, 2003 at 10:33 PM.
Jan 15, 2003, 08:41 PM
Registered User
When you start talking about that kind of serious charge current, the charger circuit usually becomes a little more complicated.....the existing 3 amp circuit can be used to "drive" a high (10, 20 or whatever amps required) output "pass" transistor stage,added to the existing charger combined with really large sink fins.... Typical useful circuits can be found under "high current voltage regulators" searches...... hope this helps...... kw