Safe Current Source | Electronic Schematic Diagram https://electronicscheme.net Schematic Diagram & PCB Design Mon, 30 May 2011 14:18:38 +0000 en-US hourly 1 https://i0.wp.com/electronicscheme.net/wp-content/uploads/2017/05/cropped-transparent_text_effect.png?fit=32%2C32&ssl=1 Safe Current Source | Electronic Schematic Diagram https://electronicscheme.net 32 32 129969089 Safe Constant Current Source https://electronicscheme.net/safe-constant-current-source/?utm_source=rss&utm_medium=rss&utm_campaign=safe-constant-current-source https://electronicscheme.net/safe-constant-current-source/#respond Mon, 30 May 2011 14:18:33 +0000 http://electronicscheme.net/?p=1011 In the above circuit diagram, a CMOS operational amplifier (op-amp) controls the current via a P-Channel HEXFET power transistor (IRF9520) to maintain a constant voltage […]

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In the above circuit diagram, a CMOS operational amplifier (op-amp) controls the current via a P-Channel HEXFET power transistor (IRF9520) to maintain a constant voltage across R1. The current is given by: 1 = VREF/R1. The benefits of this configuration are:

  • Within the event of a component failure, the load current is restricted by R1
  • The overhead voltage required by the op-amplifier and also the HEXFET IRF9520 is very low.
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