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Square wave input, PWM output?

Discussion in 'General Electronics Discussion' started by rsajan1, Apr 1, 2011.

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  1. rsajan1

    rsajan1

    2
    0
    Nov 3, 2009
    Hi folks,

    I'm trying to find an IC or simple circuit that gives a pulse width modulated signal for a DC voltage input. For example, the input to this would be a square wave alterating between 0 and 5V. When the input is 0V, the output is 0V but when the input is 5V, the output should be a 0-5V square wave with a controllable frequency.

    The input comes from a comparator, maybe there are comparator ICs that have this as an in-built function? I cant seem to find any.

    Thanks!
     
  2. rob_croxford

    rob_croxford

    262
    0
    Aug 3, 2010
    Do you want to vary the Frequency or the Duty cycle?? PWM is generally a variance in duty cycle to control the gate pin of a swtiching device, for instance. Or it can be used to vary the direction of a servo motor...

    What is your application?
     
    Last edited: Apr 8, 2011
  3. Iron Will

    Iron Will

    16
    0
    Jun 11, 2012
  4. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    This is contradictory. An input cannot be a DC voltage AND a square wave.

    Bob
     
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