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DRV5825P: Calculate Series Isolation Resistor for the DRV5825

Part Number: DRV5825P

Hi Sirs,

Addition to sort circuit protection, Piezo speakers are capacitive in nature, we usually add a small value series resistor outside of the amplifier feedback loop to ensure that the amplifier driving it does not become unstable or oscillate at 180 degree phase shift. Since there is no such design with the DRV5825 documentation, would you please provide an equation to obtain the optimized isolation resistance based on operation frequency range and speaker capacitance?

Thank you and Best regards,

Wayne Chen