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DRV2511-Q1: Closed loop operation

Part Number: DRV2511-Q1
Other Parts Discussed in Thread: DRV2510-Q1,

Hello Team, there are some additional questions about out DRV2511:

- is there a closed loop implemented to compensate AVDD/PVDD changes on the output signal?

- Is it possible to control GAIN with a DAC?

- why is on our EVM PVDD split into two paths?

Many Thanks

Josef

  • HI Josef,

    DRV2510-Q1 is similar to DRV2511-Q1 but it has load diagnostics block. However there is no supply voltage variation compensation.
    DRV2511-Q1 gain is controlled through external resistors, how were you planning to control this with a DAC? DRV2510-Q1 gain control is set through I2C commands.
    It seems that your image didn't make it through. However I think you ask why pins 31 and 32 are separated from 17, 18 and 19, correct? This is just because they're in opposite sides of the IC package, they're connected each group to its own decoupling caps and then they're connected to the same PVDD voltage source.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • Dear Mr. Salazar,

    we could use a DAC with a voltage output from 0 to 3.3V to control the GAIN pin of the DRV2511-Q1. Is this possible?
    The supply pin groups are quite a lot apart from each other and the 22uF X7R are quite expensive (X5R is not allowed by our OEM).
    So this is a large cost factor. What is the minimum requirement regarding the capacitance at each group of pins?
    Is a combination out of MLCC and Al hybrid polymer possible? What do you recommend?

    Best regards,
    Friedrich Wieland
  • Hi Friedrich,

    It is recommended to keep 22uF and 0.1uF capacitors as in the EVM.
    Section 8.2.1.2.2 from data sheet gives more information about supply decoupling (please not there is a typo on this section where VBAT = PVDD).
    Gain pin is not associated with specific voltages but resistor divider values. You would have to evaluate performance of gain selection by using the DAC output.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators