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BQ79606A-Q1: Considerations and design of isolation in daisy chain

Charles-Chen
Genius 11836 points
Part Number: BQ79606A-Q1

Hi team,

  • Why there are separate resistors 43ohm and 10 ohm in the following circuit? How to design the value of those two resistors?
  • What's the purpose of 10K ohm resistor? I haven't seen it in the schematic of EVM.
  • What's the design consideration for 51pF capacitor?

  • What's the purpose of 1K ohm? How to design the value of it?

You can reply to me through emails.

  • 0
    TI__Genius 17370 points

    Hi Charles,

    The circuit in general is optimized for communication robustness for noisy conditions, and so we dont recommend to stray from these values. The 10k is used for when the user wants to select cap only or cap+choke isolation while we recommend reducing to 1k termination when using transformer isolation. A few things the customer can do is combine the 43, 10 into one 51 ohm but the split is to optimize filtering path on either side of the ESD diode. They can also increase 51pF to 100pF to help with reduced emissions/better emc performance.

    Regards,

    Taylor