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DRV8432 in parallel full bridge mode

Piotr Walczak
Prodigy 20 points

Welcome

I am going to use DRV8432  drivers for controlling DC motors in mobile robot. Each driver will have one motor to control. In that case I would like to use parallel full bridge mode. As I read in documentation,  PWM_A is responsible for half bridges A and B, PWM_B for half briges C and D. In figure 9 mentioned documentation I saw that inputs PWM_A and PWM_B are connected to different MCU pins. Does it means that I (as a programmer) have to provide required shoot beetwen those paths in pahse? Or can I use the same PWM signal for both PWM_A and PWM_B inputs (and driver is providing the shoot between phases)?

 

Best regards,

Piotr.

 

 

  • 0
    TI__Guru 55605 points

    Piotr,

     

    No, you do not have to provide shoot through delay protection.  It is internally handled in the device. 

     

    However, if you expect to get any output other than near zero, you will need two pins on an MCU to control the device.  

     

    Regards,

    Ryan

     

  • 0 in reply to Ryan Kehr
    Prodigy 20 points

    Thanks for your reply.

    I have got one more question if you don't mind. Is there any max. value of output  inductors in parallel mode? In datasheet it is written: For a device operated in parallel mode, a minimum of 30 nH to 100 nH inductance or a ferrite bead is required after the output pins (e.g. OUT_A and OUT_B) [...].  But does it mean that 100nH is the max value which can I use?

  • 0 in reply to Ryan Kehr
    Prodigy 145 points

    Hi,

    I have a similar design for the parallel mode of the  DRV8432 - can you show me examples of the PWM waveforms needs on the A and B inputs.