Monday, April 11, 2011

L200 Variable Power Supply

Power supply with variable voltage and fixed current regulation made using the ubiquitous L200C regulator. The versatile 5 pin L200C regulator offers both voltage and current regulation in a single package. The IC also features thermal shutdown and input over voltage protection up to 60 Vdc. The package is also available as L200CV which has straight pins for mounting onto a PCB.

L200 Variable Power supply Skema Rangkaian L200 Variable Power supply

The above circuit has current limiting of 1 amp, hence Rsc = 0.45 ohm. The output voltage is variable from 2.85V to 36V. For voltages up to 36V then the input voltage, Vcc must be 40V. The supply voltage must always a few volts higher than the maximum output voltage. If you wanted to make a 9 Volt current limited PSU then the input voltage should be a minimum of 12 Volts.

L200 Pinout

L200 Chip Specifications:
  • DC Input Voltage: 40V max.
  • Peak Input Voltage: 60V max. for 10ms
  • Output Voltage Range: 2.85 to 36V
  • Output Current Range: 0.1 to 2A
  • Quiescent Current: 4.2mA
  • Output Noise: 80uV

This variable power supply circuit from


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