PWM supply or DC power supply

Discussion in 'Power Electronics' started by sohamkul, Oct 16, 2016.

  1. sohamkul

    Thread Starter Member

    Jun 24, 2016
    43
    2
    Hello ,

    I am doing a project where i am using a screen ,
    now the Datasheet of screen says that i need to power the back-light using 3.3 V PWM .
    but instead i tried using simple 3.3 V supply.

    The back-light works fine on simple 3.3 V DC .

    Question : Should i be concerned that i didn't use PWM ? or should i use a PWM ?
     
  2. johndeaton

    Member

    Sep 23, 2015
    48
    3
    What you did is fine. You would use PWM if you want to dim the back-light. A constant supply will just keep the back-light on full bright.
     
    sohamkul likes this.
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,972
    744
    The pwm will be incase you need to dim the backlight easier, or use a variable dc supply.
     
    sohamkul likes this.
  4. sohamkul

    Thread Starter Member

    Jun 24, 2016
    43
    2
    johndeaton likes this.
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