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DRV8601: Driving a DC Actuator directly

David Dudley
Expert 1190 points
Part Number: DRV8601

Reading the datasheet, in section 7.1 it references being able to accept a single-ended DC control voltage to provide a differential output.  Can I drive a sensor coil (primary of an LVDT) directly from this device?  For input to the device I can provide a DC linear signal referenced at the midpoint reference voltage.

My drive signal is a 2.4khz triangle wave, which I can center at the midpoint of the power range.

I'm driving the primary coil of a LVDT that has a 300-600 ohm impedance at that frequency range.

Reading through the chip description, this seems to exactly fit what I need, but there's not much mention of that capability in the datasheet.

Thanks-

  • 0
    TI__Expert 8701 points

    Hi David,

    Can you clarify the application a little more? Are you trying to produce a DC output signal or a 2.4kHz output signal?
    This device was designed to drive haptic actuators in the frequency range of ~50-300Hz. Typical load resistances for haptic actuators are 8-30ohms.

  • 0 in reply to Kelly Griffin
    Expert 1190 points
    Well, looks like I'm using it for something new.

    Basically, I use a timer in a TIVA TM4C129X to generate a clock, which is processed by a Analog Devices ADA2200 to produce a 2.4khz synchronized clock for demodulation, which is then sent through a Maxim MAX270 low pass filter to generate a programmable waveform. Using an adjustable summer op-amp, I can vary the voltage the output is centered on, and using a TPL0202 digital pot, I can vary the amplitude of the drive signal as well. By the time the signal gets to the DRV8601, I can control the frequency, waveform, offset voltage, and amplitude of the signal. This is fed into IN1 of the DRV8601. The load is a primary coil on an LVDT, which has a inductive resistance somewhere between 200-600 ohms. I'm attempting to use the DRV8601 as a differential power amplifier, with the hope to be able to drive the primary coil with an adjustable AC signal, from a small value up to +/- 5V.
    The DRV8601 seemed to fulfill all the requirements I had, it "suggested" it could accept a DC input signal, and it's performance was as I would expect for an opamp, and it had a differential output, which was exactly what I was looking for.
    I'm specifically wondering about the statement in section 7.1 about using a DC control signal. If it can do that, then the part is probably exactly what I'm looking for. If not, can you suggest another?
  • 0 in reply to David Dudley
    TI__Prodigy 590 points
    Hey David,

    I looked it up and everything suggest that it can do what you need. So I would say that this is the part you could use for your application.

    Best regards,
    Marko