Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State TI Thinks Resolved
  • Locked Locked
  • Replies 9 replies
  • Answers 1 answer
  • Subscribers 84 subscribers
  • Views 497 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

I do not have a part number

Nishan Withana
Prodigy 90 points

I have a c2000 piccolo f280049c launchpad. When I connect it with the computer via USB, the main chip of the launchpad starts to get overheated. Can anyone tell me the reason for that? Is the launchpad still usable?

  • 0
    TI__Intellectual 860 points
    Hello,

    Concerned experts have been notified.
    Please note that the response might be delayed due to holidays.

    Regards,

    Sudhakar
  • 0 in reply to Sudhakar Singh47
    TI__Mastermind 32995 points
    Hi Nishan,

    How do you know it is overheated? Is it still functional?

    Were you executing any specific program/application on the device?

    sal
  • 0 in reply to Sal Pezzino
    Prodigy 90 points

    The main chip on the launchpad gets heated to a greater extent as soon as it is plugged to the usb. Cannot even touch the chip. I did not continue using the launchpad to check whether it is functioning because of that. Thought it would damage the launchpad or even the computer.

    I was trying to provide pwm signals through the c2000 to a igbt/mosfet driver IC(IR21362). I provided 18 VDC to the Vcc terminal of the IC with an external DC source and provided the required voltage input of 5V to the EN(Enable) terminal of the driver IC through the 5V output of the c2000.

    That was the last function of the c2000 before the overheating scenario.

  • 0 in reply to Nishan Withana
    TI__Mastermind 32995 points
    Hi,

    I am requesting another engineer look at this thread. For now, please see the Data Sheet to ensure you are supplying the appropriate power to the device.

    The launchpad is designed to receive power from the USB connector.

    sal
  • 0 in reply to Sal Pezzino
    TI__Guru 60865 points
    Hi Nishan,

    The C2000 device could have been damaged by applying 5V to 18V to any of the device pins.

    When you refer to the C2000 5V outputs, are you talking about using some of the GPIOs connected to the QEP 3.3V to 5V translation IC (TXB0106PWR) on the launchpad? The c2000 device itself does not have any 5V outputs, does not have 5V tolerant inputs, and should not have 5V applied to any pin.

    If you remove JP2 and JP3, do you still get heating? Does U101 correctly produce 3.3V from the USB 5V supply? Does U101 heat up excessively?

    If you only power the launchpad by providing 3.3V externally (remove the jumper from JP2 and supply 3.3V to pin 2 of JP2), does the C2000 still heat up? (or only when supplying 5V to the board via the USB)

    You can also measure the 3.3V and 5.0V current consumption by placing an ammeter at JP2 or JP3.
  • 0 in reply to Devin Cottier
    Prodigy 90 points

    Sir I have removed JP2 and applied direct 3.3V to the launchpad externally without usb power. Still the f280049cpzs IC gets heated to a greater extent at once. Previously I did not give 5v input to any pin. Just used the 5V output pin of the launchpad(shown in the picture) to provide power to the enable pin in igbt gate driver IR21362(as in the picture)

  • 0 in reply to Nishan Withana
    TI__Guru 60865 points
    Hi Nishan,

    Powering the IR21362 from the launchpad board 5V supply should be OK. Did you also connect the launchpad board ground to whatever board/breadboard the IGBT driver was on?

    If the MCU specifically is getting really hot, but the supply rails are all good, the most likely diagnosis is that the MCU device has been destroyed via some type of ESD or over-voltage or under-voltage event.

    If you have access to a good soldering setup you could try to sample another f280049c and swap the parts. If you go this route, you'd want to do a thorough sanity check of the board after you remove the old MCU before you solder down the new one.

    Otherwise I think you'll want to acquire a new launchpad.
  • 0 in reply to Devin Cottier
    Prodigy 90 points

    Of course I made the ground of IR21362( Vss and COM terminals) common with the launchpad ground pin through a breadboard connection. It was done to get a common reference. Is it the reason for the malfunctioning of the mcu?

  • 0 in reply to Nishan Withana
    TI__Guru 60865 points
    Hi Nishan,

    No, you did the correct thing; if you didn't connect the two grounds then that could potentially be a source of damage to the launchpad board.