L297 sense capacitor

Discussion in 'General Electronics Chat' started by edmundopt, Jul 11, 2011.

  1. edmundopt

    Thread Starter Member

    May 4, 2011
    60
    0
    Hello

    Some schematics have capacitor and resistor at the sense inputs of the L297, in the L297 datasheet and in the AN470 there's no mention of them, the following schematic found here : http://www.electronics-lab.com/projects/motor_light/011/index.html

    Can someone explain what is the purpose of these ?
    Is is a simple delay T = R(ohms) x C(farads) ?
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Voltage across the sens resistor takes form of a spike.
    The addition of an RC filter smooths these spikes.
     
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