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DRV2510-Q1: Power management forum

user3567505
Prodigy 20 points
Part Number: DRV2510-Q1

What is the relationship between the PWM frequency (400khz-500khz) and the required frequency for a solenoid,coil,etc.

How can this driver be used for Sub 200 Hz Solenoids? If feel like i am missing something regarding how this device functions. There are only two selectable output frequencies but people are using it to drive devices that require various frequencies. 

Best Regards,

  • 0
    TI__Guru* 84915 points

    Hi!

    Welcome to E2E and thank you for your interest in our products!

    The DRV2510-Q1 has a PWM generator which translates the analog input into a PWM signal. As you correctly mentioned, the PWM frequency can be manually selected via I2C. However, this frequency is not the main frequency that the solenoid takes to work. Let's suppose that you send a 200Hz sine wave to the analog input. This signal will be translated into a 400KHz (or 500KHz in case you select the other optional frequency). Since the solenoid has a bandwidth limited by its mechanical structure, the high frequency content won't be taken into account, leaving only the 200Hz sine wave.

    Another way to understand it would be with a low-pass filter at the output. The high frequency content will be filtered and it will result in a 200Hz sine wave.

    I hope this helps you. Please let me know if you have additional questions or comments on this.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 20 points

    Thank you for your reply, that was exactly what i wanted to know. I have just one more follow up, if I were to input a sine wave on IN+ and DC signal on IN- would the device work? Or it must be a differential input?

  • 0 in reply to user3567505
    TI__Guru* 84915 points

    Hi,

    Yes, you may DRV2510-Q1 in single-ended mode. As you correctly mentioned, IN+ will be used as analog input. In case of IN-, as mentioned in the datasheet, you need to apply either a bias level of 3V or connect the IN- input to a 0.1uF capacitor to GND to have the device self bias.

    http://www.ti.com/lit/ds/symlink/drv2510-q1.pdf#page=18

    Best regards,
    Luis Fernando Rodríguez S.