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haptic driver DRV2605 motor spect.

or sam
Expert 2020 points
Other Parts Discussed in Thread: DRV201, DRV2605, DRV8662EVM

Hi

I am using drv201 +mux in our product in order to activate some kind of motor.

with the drv201 we generates 10 HZ signal - ( absolute - sin or rect) and with the mux we do it positive or negative so the signal will be regular sinus or rectangular wave.

our motor has ~630uH inductance and 100 ohm resistance and it is working with the drv201(olthough it is out of spect)

in order to approve our product I would like to activate the our motor using DRV2605 wich I saw can generate positive and negative voltages.

my question can in produce 5-15 Hz sin continually?

what are the inductance and resistance limits of the motor? I havet seen in *** spect.

If this is driver is not good for such motor can you please advice how else can we do it?

thanks in advanced,

 

  • 0
    TI__Expert 3280 points

    Hello Sam,

    Thank you for looking at the DRV2605. Unfortunately, the DRV2605 cannot drive frequencies that low. Although I don't know all of the specifications of your circuit, I think it would be better to use DRV8601. With the DRV8601 you can drive a sine wave and use the DRV8601 to amplify it.

    Please take a look at the datasheet and let us know if you have any other questions.

  • 0 in reply to Rodney Miranda
    Expert 2020 points

    HI

    thanks for your answer.

    I read the datasheet but didnt exactly understood how it works...

    q1 - from my understanding this is some kind of diff opamp. the problem is that it doesnt get (-V) so how can it reverse the voltage to negative?

    q2- do you mean to use it as figure 15 in the datasheet shows and connect a sin wave instead of pwm or sweep the pwm duty cycle so it will generate sin in the out? (in the first option wont it cut my negative parts of the sin? in the second how gan it generate negative signal from pwm?)

    thanks in advanced, 

  • 0 in reply to or sam
    TI__Expert 3280 points

    Hello,

    Q1 - from my understanding this is some kind of diff opamp. the problem is that it doesnt get (-V) so how can it reverse the voltage to negative?

    A1 - Because the output is referenced (OUT+)  - (OUT-), the output will be negative when OUT- is greater than OUT+. For example, this is how the DC motor can brake quickly or spin the opposite direction.

    Q2 - do you mean to use it as figure 15 in the datasheet shows and connect a sin wave instead of pwm or sweep the pwm duty cycle so it will generate sin in the out? (in the first option wont it cut my negative parts of the sin? in the second how gan it generate negative signal from pwm?)

    A2 - Using as figureing 15 will be ok. Since the IN2 terminal is tied to VREF, that node will be Vdd/2 and the IN1 terminal can swing above and below it. You can see this in figure 3 &4.  If you are unable to provide a sine wave, then you can provide a PWM signal with a low pass filter. Take a look at the Filtering and Adapting PWM Waveforms in the DRV8662EVM Users Guide.

    I hope this helps and let me know if you have any mroe questions.