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TAS5414B-Q1: TAS5414B Foldback Shutdown

aftet tetfa
Prodigy 120 points
Part Number: TAS5414B-Q1
Other Parts Discussed in Thread: TAS5414

Hi,

We use TAS5414B on our custom board. We faced an issue that is thermal foldback. Our load is 2 ohms inductive and PVDD 24V. We use the outputs as PBTL. When I apply 1Vrms 100Hz sine wave to Inputs, TAS5414 shuts down the outputs and all channels immediately turn to Hi-Z. I looked at the faults via I2C and see that it gives thermal foldback and firstly shuts down the 3rd channel to Hi-Z and then other outputs. The interesting thing is some boards are working good some others give this fault. I use a heatsink on the IC and there is an EPad under the IC. I want to use this IC in maximum performance. I would like to know whats can be the reasons for the thermal foldback? How can I avoid this problem?  What should I pay attention to? Capacitors etc? Thank you. 

  • 0
    TI__Mastermind 34325 points

    Hello,

    This appears to be a heat management issue.  You are running the amplifier to hard clipping at 100Hz at its maximum voltage and minimum load.  This will be the worst case power dissipation for the device.  You are trying to produce more than 150W into 2 ohms per the two channels in PBTL.  You will need to be dissipating more than 45W from the device.  You need to look at the thermal interface material and the heatsink to make sure your thermal system is able to dissipate this heat from the device.  Please read the thermal design section in the datasheet.  I will give you guidance on thermal management.

  • 0 in reply to Gregg Scott
    Prodigy 120 points

    Hello Gregg,

    Thank you for your support. I will read the thermal design section carefully. Best regards

  • 0 in reply to aftet tetfa
    TI__Mastermind 34325 points

    No only do you need to pick the correct thermal interface material and heatsink, you need to make sure your mechanical connection is good.