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How: microcontrolled 0-12V 1A output

Discussion in 'Electronic Basics' started by andrew queisser, Apr 7, 2004.

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  1. I'd like to have my microcontroller (8051) control a
    0-12V DC output voltage with up to 1A. It doesn't
    have to be accurate (e.g. 8bit is enough) and it doesn't
    have to be very clean - it's for an LED illuminator

    I know I could use a linear regulator and an D/A
    converter or a digital potentiometer but I'm wondering
    if it would be better to use a switching regulator so
    I don't dissipate so much power.

    Any example circuits how to control a switching
    regulator? Any suggestions for devices? I've been
    looking at some Maxim chips but I'm not sure how
    to connect up the feedback input with the output
    of the D/A converter.

    Thanks for any hints,
  2. Al Borowski

    Al Borowski Guest

    If you are just dimming some LEDs, just use Pulse Width Modulation (PWM)
    with a FET or BJT.

    EG fully on: -------------------
    fully off: __________________
    50% on; ----_____-----_____-----

    where --- = power applied and ____ = power off

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