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TUSB7340: TUSB7340 : Heating Issue and Reset upon heating

Harshal Pawar94
Prodigy 90 points
Part Number: TUSB7340

Hello,

I have implemented TUSB7340 for one of my design and I have been facing some heat related issues.

Under normal conditions, the chip stays at around  70 degrees Celcius and works fine. But a little load on the USB device and TUSB7340 starts to overheat and resets itself.

I have attached the screenshot of design for reference.

Your help and contribution will be valuable.

Thank you.

- Harshal Pawar
harshal_pwr@outlook.com

  • 0
    TI__Guru* 76130 points
    Hello,
    Is the 70C ambient or case temperature?
    It could be the thermal pad is not properly grounded, can you take some x-ray?
    What is the failure rate?
    You have to place AC coupling capacitors on the SS_TX lines.
    Regards
  • 0 in reply to Elias Villegas M.
    Prodigy 90 points
    Hello Elias,

    Thank you for the response.
    1. 70C is the case temperature. (these are old board temperatures. My new board gets even hotter and at faster rate)
    2. I can try and get the board X-rayed but can't promise (hobby project, low budget)
    3. Failure rate is 9/10.
    4. With next revision, I am placing AC coupling caps on SS_TX line.
    4.1 Those caps will be placed close to the receiver, correct?
    4.2 what's the specification of the capacitor? (voltage rating, tolerance, etc)

    Best regards,
    - Harshal
  • 0 in reply to Harshal Pawar94
    TI__Guru* 76130 points
    Hello,
    The caps should be placed as close as possible to the USB connector.
    The maximum size cap is 0402, C-packs are not allowed.
    Regarding the heating issue, I would go after the thermal pad soldering.
    Regards