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Dustcontamination

trond inge wang
Intellectual 385 points
Other Parts Discussed in Thread: TAS5630B

Hi TI,

we are using TAS5630B and the power supply voltage is 50V and the package is DKD.

We have seen that a few samples have had shorted outputs and exploded. We suspect dust to be the cause (the amplifier has fans). We wonder if antistatic carpets could be the reason, but can not verify this. To be on the safe side we will now test if PCB coating will help. The failure occurs after 2-3 years or more. 

Have you seen before that dust can cause such a failure? 

Do you think PCB coating will be a fix? The chip operate under changing temperature from ambient up to 90C.

Trond Wang

  • 0
    TI__Genius 9175 points
    Hello Trond,

    I don't believe we have seen any failures due to dust in the field.

    The over current protection should protect the amplifier in the event of a shorted load. If dust contamination around the device is the cause of failure, I suspect a short on anther pin would be the cause.

    Are there any burn marks on the board that lead you to believe this is an output short failure?
    Do you have any photos of a failed board that you can share with us for a visual inspection?

    Best Regards,
    Matt