Charger Circuit of LM317

Published:2011/7/16 11:03:00 Author:Michel | Keyword: Charger Circuit | From:SeekIC

The above picture is charger picture of LM317.It adopts LM317 constant current to charge and its input voltage Ui is +17~+30V and the output voltage is U.The largest voltage is 3.8V and largest current is 1A.The output voltage is same with termination voltage of charged battery,they are set by dividing resistor R1 and R2.RS tests output current and VT1 and automatically adjust the LM317,thus output voltage is consistent with battery terminal voltage.And it outputs constant current which is about 1 A.RS resistance obeys the following formula, namely RS = UBE / 1 A = 0.7 V / 1 A ≈ 0.7 Ω and it chooses 0.68Ω in the circuit



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