This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS5631B, Protection Circuitry, AVR application

Other Parts Discussed in Thread: TAS5631B

Hello,

I'm designing a 70W x 3 hifi AVR product for a client.

We are looking at using the TAS5631B part in a hifi AVR product.  The AVR will have user accessible terminals in the back of the amp.  The TAS part seems to check for output shorts to ground on startup but not afterwards.  We are concerned that a user may leave the amp on while connecting a speaker and may accidentally short an output to chassis ground (since the outputs are sitting at half supply).  From the datasheet it seems that this would break the part.  Please help us confirm/deny this.  If it would indeed break the part, can you recommend how best to use this part for an AVR product?  Is there an app note to reference or a better part to use?  

Thanks, 

Ben Gebhardt

Refactory, Inc

  • Hi, Ben,

    Sorry for the delay.

    As long as your inductance doesn't drop below the recommended value in the d/s (from memory, 7 uH), the over-current protection will protect the device if the outputs are shorted after the LC filter.

    The protection at start-up is designed to prevent manufacturing issues (solder bridges, etc) from blowing up the device when it's first tested at the factory.

    -d2