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Original question:

TAS6422E Thermal pad connection.

TAS6422E-Q1: Is a GND connection for the Heat Sink a must have?

Jacob Wyrick
Expert 6035 points
Part Number: TAS6422E-Q1

Hi team,

I'm a bit confused by the dialogue in the question related to this thread. It seems that the heat sink can be electrically isolated from the heatsink (no current flow) but must still have a nearby connection to ground. I'm a bit confused why the GND connection would be needed.

For example, if I design a board and plan to use a metal extrusion on the case housing as the heat sink - with no electrical connection - would that still be okay? Or would the metal case housing then also need to be connected to GND near the TAS6422E-Q1?

Thanks,

Jacob

  • +1
    TI__Genius 9180 points

    Hello Jacob,

    This ground connection requirement is not for device functional. whatever heatsink grounded or not, the device can operate with normal functions and audio performance.

    This ground connection requirement is for EMI consideration.  Assume a board and use a metal extrusion as case housing and heatsink.  If there is not any heatsink-PCB ground connection, then this heatsink would be electrically floating, and any noise at device thermal pad will coupled to heatsink via parasitic capacitance. then this heatsink would becomes a huge antenna and result in EMI problem.  An effective way is grounding the heatsink to PCB ground in some way, neither contact by screws or by springs...

    Dylan