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DRV8860: PWM Frequency

Part Number: DRV8860
Other Parts Discussed in Thread: DRV8803, DRV8932

Hello

I was looking at the DRV8860 for a solenoid control application - I hit the solenoid with 100% duty cycle and then hold a 50% duty cycle. But, I need the solution I choose to have a switching frequency between 20 and 40 kHz. According to the below snippet from the datasheet, this device will be operating at 50kHz when the duty cycle is >25% (which is all the time in my application).

Question: Is there a different device that operates in my desired frequency range and has similar functionality to the DRV8860?

Thanks!

  • Hi Jackson,

    The DRV8803 is a 4-channel low-side driver that can control the load with pulse-width modulation at frequencies from 0 kHz to 100 kHz.

    DRV8803

    Best,

    David

  • Hi David,

    Thank you for the reply, a couple questions for you here:

    • I don't see information on how to select what frequency I want between 0 and 100 kHz in the device's datasheet, is it a register I need to set? Is it a certain resistor configuration on one of the pins?
    • I also don't see the duty cycle information that was available in the DRV8860's datasheet, is the DRV8803 able to achieve 100% and 50% duty cycle? How is that configured?
    • Would this device be able to drive 24V/150mA solenoids?
    • I don't see any communication ability with this part (SPI or I2C for example), is there a different device that has that ability?

    Thanks!

  • Hi Jackson,

    The DRV8803 has a PWM control mode and a GPIO control interface. An external MCU is required to send PWM inputs to the driver and is capable of driving 24 V at 150 mA with either package. 

    Because the DRV8803 is a GPIO interface it does not have the onboard registers to support the same features as the DRV8860. 

    The DRV8932 does feature configurable Off-Time PWM chopping and should be capable of supporting current and voltage requirements.

    DRV8932

    Best,

    David