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TMS320C28334 PWM Resolution

Al B
Expert 3020 points

What is the PWM resolution at 20KHz and 40KHz?  What impact does dead time have on this?

  • 0
    Genius 5170 points

    Resolution will depend on timer clock frequency as well... .. this is the equation most likely can be used to calculate the resolution

    n = log( timer clock frequency / PWM frequency) / log (2) , where 'n' is PWM resolution in effective number of bits

    For example if you have 20kHz PWM with 50 Mhz clock then PWM resolution is

    n = log( 50 Mhz/ 40kHz ) / log (2) = 10.28 effective bits

    for 20kHz

    n = log(50MHz /20kHz )/ log (2) = 11.28

    Dead band will introduce output distortion but your effective resolution should stay the same.