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the DPWM engine of UCD9222

guoping Lee
Expert 1010 points
Other Parts Discussed in Thread: UCD9222

Hi,

the datasheet of UCD9222 said the compensator calculates the necessary duty cycle as a digital number representing a percentage from 0 to 100%,the duty cycle value is multiplied by the configured period to generate a comparator threshold value.

where can I define the configured period?and what's the relationship between configured period and the high speed switching period?

  • 0
    TI__Genius 13700 points

    The controller will determine the switching period from the configuration parameter FREQUECNY_SWITCH, the defined switching frequency of the rail, there is no need to manually configure the period.

    The switching period is the reciprocal of the switching frequency.

    The term you are refering to from the datasheet is high speed switching period counter, it is a high speed counter that is reset at the beginning of each switching cycle which terminates the current DPWM output when its value equals the calculated on time (duty cycle * switching period).