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TDA4VM: ERPWM and TIMER output PWM issue

Cherry Zhou
Mastermind 22235 points
Part Number: TDA4VM
Other Parts Discussed in Thread: TDA4VH

Hi team,

Here're 2 questions from the customer may need your help:

1) What frequency and duty cycle can the PWM output of the timer of the TDA4VH reach?

2) What frequency and duty cycle can the Ehrpwm output of the TDA4VH reach?

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 22235 points

    Hi,

    May I know is there any update on this issue?

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Genius 10180 points

    Cherry,

    eHRPWM period is defined based on the counter mode.  For up-count and down-count, the period is Tpwm = (TBPRD + 1) * Ttbclk.  Whereas for up-and-down count mode, the period is Tpwm = 2 * TBPRD * Ttbclk.  Where Ttbclk is the system clock (125 MHz) divided by pre-scaler set in EPWM_TBCTL register.

    Figure EPWM Time-Base Submodule Signals and Registers in the TRM should give the customer a better understanding of how this is defined.  More information on duty cycle can also be found in the corresponding Enhanced Pulse Width Modulation (EPWM) chapter.

    I'm not as familiar with PWM module, will get back to you on the max output frequency.