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LMC555: LMC555

Part Number: LMC555

Hello, I'm utilizing the LMC555 timer to produce PWM with a duty cycle between 45-55% and a frequency of 84.5KHz. The timer is set up in A-stable mode, and I'm facing challenges in understanding two key aspects. Firstly, I have two MCUs arranged in parallel, and for redundancy purposes, I'm using them to generate signals sent to the AND gate. The AND gate's output is intended to drive the timer for PWM signal generation. I'm uncertain about the pin operation, specifically whether the output of the AND gate should be connected to the TRIG pin or the control voltage pin. Your insights would be appreciated. Thanks!

  • Hello, 

    Using the Astable mode of operation you can control the comparator trip points inside the timer by adjusting the control pin voltage of the timer. Below shows an example of the output waveform square wave pulse width adjustment when the control voltage is adjusted. 

    Best Regards, 

    Chris Featherstone