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TAS2553: Voltage Maximum Rating on BIAS pin & Withstanding Voltage for External Capacitor

hideyuki sakai
Mastermind 6250 points
Part Number: TAS2553
Other Parts Discussed in Thread: TAS2552

Dear, Sir.

My customer is develping their platform to apply TAS2553, so that they are asking

a few things at this time. I tried to check the datasheet but it is not deifined clearly.

Please give your advice.

1. How much is the Voltage Maximum Rating on BIAS pin?

2. The datasheet is recommended 1uF as the external capacitor value, but its

    withstanding voltage is not clear.

    According TAS2552 EVM 10V withstanding voltage capacitor is mounted it on.

    How much is the withstanding voltage for external capacitor on BIAS pin?

Best Regards,

H. Sakai

  • 0
    TI__Guru** 100715 points
    Hi Sakai-san,

    Bias output pin is a mid-supply reference voltage for external decoupling (for better PSRR). This mid-supply reference is in relation with AVDD so you will have AVDD/2 on BIAS pin. AVDD shouldn't go over 1.95V in any case.
    10V is more than enough for this pin.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    Mastermind 6250 points

    Dear, Ivan-san. 

    Thank you so much for your helpful information. 

    Firstly, I thought the capacitor was for Boost output. It is miss-understanding. 

    The withstanding voltage 2.0V - 2.5V is enough for this capacitor considering AVDD/2

    bias plus margin. 

    I wonder lower ESR & ESL will be better?

    Best Regards, 

    H. Sakai

  • 0 in reply to hideyuki sakai
    TI__Guru** 100715 points
    Sakai-san,

    Low ESR & ESL would be fine. Although if not possible you can try with different capacitor and evaluate PSRR performance and see if it's good enough.

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