Constant current Constant voltage IC

Discussion in 'General Electronics Chat' started by Vasanthkini, Jul 24, 2010.

  1. Vasanthkini

    Thread Starter Member

    Jun 9, 2010
    Hey guys,

    I have been using the constant current constant voltage IC's since a long time for now but i have absoluetly no idea how these operate.I have not found any application notes or design references based on these on the web.I have mentioned a few datasheets of these kind of IC's from different manufacturers.Can some one help me out in fiuring out how these exactly works?

    Thanks !:)
  2. tom66

    Senior Member

    May 9, 2009
    There's an application note on page 8.

    It's basically the same as a constant current source op-amp circuit and a constant voltage (voltage regulator) op-amp circuit, except it integrates a fairly accurate voltage reference and both op-amps.

    This would generally be used in the feedback section of a switch-mode power supply, which is why it is opto-isolated.
  3. Audioguru

    New Member

    Dec 20, 2007
    It regulates the voltage until the max allowed current is sensed by R7 in the application circuit. Then the current regulator reduces the output voltage enough to limit the current to the amount set by R7.