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BQ79606A-Q1: Daisy chain components selection quesion

Gary Jiang
Intellectual 980 points
Part Number: BQ79606A-Q1

Hi team,

My customer wants to ask the following 2 questions:

1. In cap isolation application, why use 10 ohm in series to 43 ohm, rather than use one 49 ohm or 51 ohm resistor? Can we use one resistor to replace?

2. Does the ESD placing position strict? Can we place the ESD to the left of 2200pF, or near the 10k terminal resistor?

Thank you!

  • 0
    TI__Genius 9301 points

    Hello,

    For question #1, The 43 Ohm resistor will help to limit the current going into the COML/P or FAULTL/P pins. The 10 Ohm is to protect the ESD device by limiting the current going through it. 

    For questions #2, we have only tested the circuit using the recommended placement of the ESD. If the customer wants to place it in a different location they need to do all necessary testing to ensure this works correctly in their application.

    Best regards,

    Leslie

  • 0 in reply to Leslie Marquez
    TI__Intellectual 980 points

    Hi Leslie,

    Thank you for your reply.

    For your answer #1, I suppose place a 50 ohm resistor between the isolation cap and TVS diode can help limit current flowing into COML/P and TVS diode. Is my point reasonable?

    Thank you again.

    Gary

  • 0 in reply to Gary Jiang
    TI__Genius 17370 points

    HI Gary,

    No if you choose to go that route, it would be better to have the 50ohm on the pin side (where the 43ohm is in the above drawing) instead of on the connector side so you can protect the inrush current into the pin as opposed to the ESD diode. 

    Regards,

    Taylor