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DRV8412: DRV8432 Some problems appear in the process of use, I hope to answer.Thank you.

??? ?
Prodigy 10 points
Part Number: DRV8412

Tool/software:

1. How to set up CBC and OCL mode? Can I only use CBC mode alone and turn off the overflow self-locking?

2. Monitor which position can well monitor the overcurrent protection, and which position with the oscilloscope can clearly see the current to reach the overcurrent protection point?(Can help us mark it on the circuit diagram.)

3. After we adjust the resistance value and raise the overcurrent point, the output voltage will suddenly get out of control and become very large. What is the reason for this? Is there any solution?

4. When our instrument switch power supply is started, there is a large burr, which sometimes directly causes the overflow alarm. Is there a good way to deal with it?

Here is the circuit diagram of our DRV8432. Can you help us see any problems with our use? Thank you.

  • 0
    TI__Mastermind 23261 points

    Hello,

    ??? ? said:
    1. How to set up CBC and OCL mode? Can I only use CBC mode alone and turn off the overflow self-locking?

    See 7.3.2.2 Overcurrent (OC) Protection for a full description of the features, and see the table below for how to set the M1/M2/M3 pins for with/without CBC. OCP protection will always be there 

    ??? ? said:
    2. Monitor which position can well monitor the overcurrent protection, and which position with the oscilloscope can clearly see the current to reach the overcurrent protection point?(Can help us mark it on the circuit diagram.)

    Measure the current of the output (OUT_A or B or C or D), put a current clamp around it

    ??? ? said:
    3. After we adjust the resistance value and raise the overcurrent point, the output voltage will suddenly get out of control and become very large. What is the reason for this? Is there any solution?

    What is your load - is it a TEC or a motor? Can you post a scope capture of this happening? And what OC_ADJUST resistances are you trying? 

    ??? ? said:
    4. When our instrument switch power supply is started, there is a large burr, which sometimes directly causes the overflow alarm. Is there a good way to deal with it?

    You should PWM ramp/accelerate the input slowly - don't just turn all the outputs 100% on instantly.  Increase PWM duty cycle from 0% to 100% over 1 second for example

    Is this a new design?  This part is End of Life (EoL) and you should really use a newer part:  (+) [FAQ] What are the best alternate devices for DRV8432? - Motor drivers forum - Motor drivers - TI E2E support forums 

    Best,

    Jacob