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Original question:

DRV8353RS-EVM: How to use x1 PWM Mode

DRV8353RS-EVM: 1xPWM with 8353 in 4 Quadrant Mode

turguy goker
Prodigy 220 points
Part Number: DRV8353RS-EVM

Tool/software:

Is there a diagram showing 4 quadrant mode operation and FET and diode conditions for all 4 quadrants with PWM and PWM! as shown in table 8.3 in 8353 specification. I think this might work for 4 Quad control. However I like to see a current flow per quadrant per Table 8.3 including current flow and polarity conditions.

  • 0
    TI__Guru 55555 points

    It is a US holiday today.  Please expect some delay.

  • 0
    TI__Genius 12231 points

    Hi Turguy, 

    I do not believe we have a figure with information already,  so please allow me to draw it out and follow-up before the end of this week. 

    Best Regards,

    -Joshua

  • +1 in reply to Joshua Maize
    TI__Genius 12231 points

    Hi Turguy, 

    Thank you for your patience! 

    I have built a table for a given phase's FET/body diode conduction paths during each quadrant of motor operation that should help you visualize the activity of the power stage. I believe this should be more helpful and easier to understand than trying to show each path on a physical diagram.

    Quadrant Speed Torque PWM State FETs/Diodes Active (for a given phase) Current Path
    1 +ve +ve PWM: HS MOSFETs on HS active, LS body diodes Battery → HS → Motor
    !PWM: LS diodes conduct LS diodes, HS off Motor → LS diodes → Battery
    2 +ve -ve PWM: LS MOSFETs on LS active, HS body diodes Motor → LS → Battery
    !PWM: HS diodes conduct HS diodes, LS off Battery → HS diodes → Motor
    3 -ve -ve PWM: HS MOSFETs on HS active, LS body diodes Battery → HS → Motor
    !PWM: LS diodes conduct LS diodes, HS off Motor → LS diodes → Battery
    4 -ve +ve PWM: LS MOSFETs on LS active, HS body diodes Motor → LS → Battery
    !PWM: HS diodes conduct HS diodes, LS off Battery → HS diodes → Motor

    I hope this helps you with your evaluation and understanding. And if there are any additional questions please feel free to reach out again! 

    Best Regards,

    -Joshua