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TMS320F28335: TMS320F28335

MAHETAB ALAM
Prodigy 55 points

Part Number: TMS320F28335

Hello 

I am using C2000 Experimenter kit with TMS320F28335 control card. As soon i am plugging in the docking station to my system, a section U2 on the control card is getting overheated in a matter of few seconds. 

 I have verified the voltage levels at the 5 & 3.3 Volts pins and they are not altered and GPIO pins are also working fine. What may be the possible cause ? 

  • 0
    Guru 192875 points
    Hi,

    U2 is the LDO and it getting heated up is not a good sign. This in-turn is an indication that there's a short somewhere. Is the controller temperature fine? Are you able to program the same?

    Regards,
    Gautam
  • 0 in reply to Gautam Iyer
    Prodigy 55 points
    Thanks for the reply Gautam Sir
    Temperature is not okay but still i can program it. It seems like one of the IC over the U2 section is getting roasted.
  • 0 in reply to MAHETAB ALAM
    Guru 192875 points
    U1 or/and U2, you might've to replace.

    Regards,
    Gautam
  • 0 in reply to MAHETAB ALAM
    TI__Mastermind 42195 points

    Mahetab,

    I would suggest not using the controlCARD until this issue is resolved.

    • Is this a brand new controlCARD or have you used this before?

    I cant think of any configuration that would cause this... but as Gatuam suggested it sounds like something is shorted. My first thought is that if the DC-DC converter (U2) is hot it is most likely 3.3V shorted to something(likely ground).

    • What do you have connected the controlCARD and docking station?
    • Can you remove everything and try again? 
    • Could you attach a picture or two of your setup?
    • Are you setting the controlCARD on a conductive surface? Many of the pins are through hole components and could be accidentally shorted on the backside.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Prodigy 55 points

    Hello Cody
    Its not a new one , we have used it before.
    I am using it for PWM generation and GPIOs are connected to the driver circuit of inverter. I have also checked it without any connection as well. Heating starts at that particular area as soon it is connected to the system without any of the driver connection.

    Regards
    Mahetab

  • 0 in reply to MAHETAB ALAM
    TI__Mastermind 42195 points

    Mahetab,

    it sounds like you may have accidentally damaged the F28335, this  is easy to do when interfacing with power electronics. 

    From my experience when the device sinks too much current for too long is that 3.3V becomes shorted to GND. Measure the resistance between a ground pin and a VDD pin. Without removing the device you cant prove that it is the F28335 that is damaged, but if the resistance is low at least we will know why U2 is heating.

    Try this:

    1. Measure the resistance between VDD and GND on the docking station's pins(with the controlCARD still inserted). ( It should be high, but i expect you will see something under 100 ohms)
    2. Remove the controlCARD and measure the resistance again.
      1. If it becomes an open then the problem is on the controlCARD.
      2. if the resistance stays low then the problem is likely in the docking station.
        1. Then measure the resistance between VDD and GND on the controlCARD while disconnected from the docking station.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    TI__Mastermind 42195 points
    Mahetab,
    Have you had any luck finding your issue?

    Regards,
    Cody
  • 0 in reply to Cody Watkins
    Prodigy 55 points
    Yes Sir
    Problem is in the the control card according to the suggestions given by you.

    Thanks again