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DRV2510-Q1: Transformer primary being driven by a haptics IC

Mark Pearson
Genius 12705 points
Part Number: DRV2510-Q1
Other Parts Discussed in Thread: DRV2700

Question for the Haptics driver folks.

Any issue with using the DRV2510 / DRV2511 in driving the primary of a transformer with these ICs?

The Datasheet is unclear as to how it operates... for example, there is a register setting for a 400kHz or 500kHz setting: what is this for?

I'm guessing that when IN+ is high and IN- is low the device drives the OUT+/- pins with the 400 or 500kHz signal.

Is this correct?

Figure 5 in the datasheet is good in showing the relationship of OUT+/- to the solenoid current... do you have a similar figure showing the IN+/- relationship to OUT+/-?

Is it 1:1? (datasheet doesn't say).

Last item: Figure 17 in the datasheet shows pins FS0, FS1 and FS2... what are these? (two are SDA and SCL... and the 3rd one?)

Thanks!

  • 0
    TI__Guru* 84915 points
    Hi, Mark,

    We will take a look at this and will answer as soon as possible.

    Best regards,
    Luis Fernando Rodríguez S.
  • 0 in reply to Luis Fernando Rodriguez S.
    TI__Guru* 84915 points
    Hi, Mark,

    Sorry for the late response.

    Please take a look at my answers below and let me know if you have additional questions or comments.


    Q: Any issue with using the DRV2510 / DRV2511 in driving the primary of a transformer with these ICs?
    A: I wouldn't suggest to use the DRV2510 since it doesn't have flyback mode. Usually the transformer is recommended for cases where the boost converter or output driver cannot reach the desired voltage. The DRV2700 is an example of a device that supports flyback mode. Its datasheet contains information about the correct way to connect a transformer.


    Q: The Datasheet is unclear as to how it operates... for example, there is a register setting for a 400kHz or 500kHz setting: what is this for?
    A: This register selects the oscillator frequency that the PWM will operate. The OUT+ and OUT- outputs will be operating at this frequency value.


    Q: Figure 5 in the datasheet is good in showing the relationship of OUT+/- to the solenoid current... do you have a similar figure showing the IN+/- relationship to OUT+/-?
    A: No, there's no figure that shows the IN+/- current. Usually, the input current is not mentioned in the datasheet due to the high impedance input value. The output current is taken from the VDD power supply and the input current uses to be negligible compared with the output current.


    Q: Last item: Figure 17 in the datasheet shows pins FS0, FS1 and FS2... what are these? (two are SDA and SCL... and the 3rd one?)
    A: Thank you for your observation. This figure seems to be based on another device that contained different pin functions. They should refer to the control pins like the I2C communication and probably a GPIO. We will work to have this corrected for the next version.


    Thank you.

    Best regards,
    Luis Fernando Rodríguez S.