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DRV8432 Bridge Control

ArdWar
Prodigy 230 points
Other Parts Discussed in Thread: MSP430FG4618, DRV8412

Is it possible to control DRV8432 this way? Especially the fast decay part, as it isn't mentioned in the datasheet.

PWM_A PWM_B /RST_AB Function
1 0 PWM Forward, fast decay
0 1 PWM Reverse, fast decay
PWM 0 1 Forward, slow decay
1 PWM 1 Forward, slow decay
PWM 1 1 Reverse, slow decay
0 PWM 1 Reverse, slow decay

If it is possible, then are there any drawbacks?

  • 0
    TI__Guru 55615 points

    Ardian,

    The only thing to consider in the fast decay portion of the table is that the current will recirculate asynchronously through the internal body diodes of the power FETs.../RST=LOW means the H-bridge is HIZ or disabled.  As the voltage drop across the diode is higher than the Rdson of the FET, this will lead to higher device temperatures than using a synchronous fast decay mode where the opposite FETs are turned on to decay current out of the load.

    If this is a DC motor, for maximum torque (higher average current), we recommend using only slow decay modes. 

  • 0 in reply to Ryan Kehr
    Prodigy 55 points

    i want to know the interfacing of motor driver 8432 with the MSP430FG4618

  • 0 in reply to rupak kumar
    TI__Guru 55615 points

    Rupak,

    I suggest looking at the DRV8412-C2-Kit to see how we interface it to a micro-processor from our C2000 family.  From there, you can see the signals required for the DRV8432.  For code base, we don't have anything in the MSP430 today that is specific to the DRV8432, but we do have example code available in the DRV8412-C2-Kit.

    It is pretty straight forward since the DRV8412 only needs up to 4 PWM signals and 2x RESET signals for control.  Two GPIOs to monitor faults (/FAULT and /OCTW) and that is it.

     

  • 0 in reply to Ryan Kehr
    Prodigy 55 points

    hello,

    I want to that from where I can get the library file(.lbr) for the PCB designing in the Eagle 5.1 of the followings:

    1) DRV8432 full bridge 36HSSOP

    2) CC2500 LP20QFN

    3)MSP430FG4618 Flash 100LQPF

    4)LMP 7731-IL658958

    with regards

    Rupak