Circuit Schematic 12V Constant Voltage Battery Charger using Regulator IC L200

BatteryCharger. - Here is Circuit Schematic 12V Constant Voltage Battery Charger using Regulator IC L200. This battery charger is based on L200 regulator IC. L200 is a five pin adjustable voltage and current regulator IC.

This regulator IC is used to keep the charging voltage constant up to maximum charging current. After exceed this limit drop charging voltage and maintaining maximum charging current. The L200 design allows some leakage from cells connected while the circuit is not powered. D1 prevents this loss and protects the circuit from reverse polarity.

The L200 needs an input voltage that is at least 2v higher than the output to be able to yield the full rated output. You also need sufficient volts to cover the forward voltage drop of D1. With a 0.6V D1 drop, the input to the L200 needs to be 2.6V higher than the desired output.

Component List
  • R1 820Ω
  • R2 0.47Ω 3W (see texts)
  • R3 1.8kΩ
  • R4 1kΩ Preset
  • C1 470µF 35V
  • C2 0.1µF (104)
  • D1 1N4148
  • D2 1N5401
  • PV1 2 ampere meter
  • IC1 L200 regulator IC

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