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DRV103: Determining whether a Linear Potentiometer can be used to control the Oscillator Frequency Adjust.

Alistair Young
Prodigy 40 points
Part Number: DRV103

Hello,

As the title states, I am interested in whether the DRV103 can use a linear potentiometer to control the "Oscillator Frequency Adjust" pin, in a solenoid driver application.

Also, to run the frequency @ 400hz , am I correct in my calculations that I need a 14.3 M Ohm resistor?

Thank you for your help,

Alistair Young

Engineering, Rocker Industries

  • 0
    TI__Genius 10855 points

    Hi Alistair,

    Welcome to E2E! Thanks for your question!

    A linear/digital potentiometer can be used to adjust the duty cycle.  Here's an example of a Solenoid valve driver using a similar device, the DRV101. In this example, a 1M pot is used to adjust the duty cycle. This design could also provide you with a few tips while making your design.

    A 14.3M ohm resistor would be roughly the correct value to operate at 400HZ. However, the oscillator frequency range is spec'd to 0.5 - 100 KHz in the datasheet. We can't guarantee that the device will operate within operating conditions at 400Hz. 

    Thanks,

    Arthur Huang