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DRV110: Configuring Peak and Hold Currents vi a uController (SW) and not passive components

Davide Arzarello
Prodigy 100 points
Part Number: DRV110
Other Parts Discussed in Thread: DRV103

Any idea or suggestions on how to mange the PWM duty cycle fort Hold and Keep state and so the current in DRV110 using a "software" approach instead passive component

would like to substitute the Rpeak and Rhold with something that is controllable from uController GPIO 

In components like DRV103 I see there is possibility to have voltage controlled duty cycle so use uControlled DAC to regulate PWM duty cycle

Any linear relationship between Peak and Hold voltage and duty cycle ? 

br

Davide

  • 0
    TI__Intellectual 1965 points

    Hi Davide,

    Thanks for your question. Let me contact the expert for this part. You can expect a response by 2/4/20.

    Best,

    Grant

  • 0
    TI__Mastermind 18550 points

    Hello Davide,

    Thank you for your post. I am assigning it to the engineer responsible for supporting this device. Please expect a response by 2/4/2020 or earlier.

    Kind Regards,

    Liaqat

  • 0
    TI__Expert 4940 points

    Hi Davide,

    Peak and Hold current can be software controlled, a DAC 0 to 1V will do the job.

    I'll send you the schematic Monday, in the mean time can be more specific what's the target for PWM control?

    That's not a direct linear dependency between PWM and Rpeak/Rhold. In an ideal word there are independent,

    but noise and external components can force the duty cycle>100%,externally  the frequency will look smaller than set PWM

    Regards,

    Costin

  • 0 in reply to Costin Cazana
    TI__Expert 4940 points

    Hi Davide,

    For external Ipeak/hold current control the voltage DAC varies the Ipeak/hold pin current.

    For full range control Vdac should be 0V to 1V and Rdac_peak/Rdac_hold=66.67kohm

    The example  plot external components are:

    Rdac_peak=Rdac_hold=66.67kohm

    Rs=1ohm

    Rs valus will affect just Ipeak/Ihold

    Regards,

    Costin