Using an LED driver vs Individual Outputs

Discussion in 'General Electronics Chat' started by mdwLL, Dec 1, 2015.

  1. mdwLL

    Thread Starter New Member

    Dec 1, 2015
    I'm trying to decide if I should use an LED driver in my project or not. My board is a microcontroller + radio running on 3 AA batteries and I'm trying to drive 3 white LEDs rated for 3.2V @ 20mA each.

    Would it be more power efficient to run each of these LEDs with PWM off their own output pins, or to connect them in series and drive them using a PWM compatible LED driver like this one? I'd like to avoid using this driver if possible, as the switching current it creates sometimes causes problems with the radio that I'm using (nRF24L01+). However, battery life is the greatest concern that I have.

  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    That looks like a good choice for a driver. It is rated for PWM use, and it avoids the waste of battery power that a series resistor would entail.
    cmartinez likes this.