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MCT8316A: MCT8316AEVM evaluation board controller chip exception

Cherry Zhou
Mastermind 22235 points
Part Number: MCT8316A
Other Parts Discussed in Thread: , MCF8316A

Hi team,

Uses MCT8316AEVM to drive brushless DC motors and operates with adjustable switching power supply (29V supply, approximately 1.3A output current).

After debugging is good, run an aging test, The environment is stable at about 35℃. After about 50 hours of continuous operation, the chip does not work properly and the motor stops. The voltage at the VM and VBAT inputs changes to 4.2 V, while the adjustable switch voltage remains at 29 V, showing an output current of 0.

The original chip of the board was the MCF8316A, which was replaced with the MCT8316A for testing because two chips were burned in succession. 

Could you help check this case? Thanks.

Best Regards,

Cherry

  • +1
    TI__Mastermind 24405 points

    Cherry,

    MCx8316A can run on the EVM without triggering temperature shutdown up to 70W. I see that you are operating at 29V, 1.3A = 37.7W which should be fine. I'm guessing the MCT8316A IC might not have been soldered properly - the device might not be making good contact to the thermal pad. Can you check the top case temperature of the IC after 30 min to check if the IC is getting overheated? 

    Regards,

    Vishnu 

  • 0
    TI__Mastermind 18916 points

    Hi Cherry,

    Please let us know if the latest response has addressed your question, or if you have further information to provide so that we can further debug. If your problem has been resolved, please help mark the thread as resolved.

    Thanks and Best Regards,
    Andrew