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TMS320F28379D: IC getting hot

beesetty rajesh
Expert 1055 points
Part Number: TMS320F28379D
Other Parts Discussed in Thread: TPS62080

Sir/Madam,

We have built a TMS320F28379D customized board and we succeeded basic testing like led blinking etc. As soon I power the the board, the F28379D IC gets hot. We followed all the guidelines mentioned in the datasheet like powerpad connecting to the ground.

I never have observed temperature of this magnitude when working on F28379D launchpad.

Regards,

Rajesh BN.

  • 0
    TI__Mastermind 41335 points

    Sounds like there is an issue. This device will not generate significant heat an standard ambient temperatures while operating normally. EOS is usually the most common issue which causes damage leading to a low resistance paths for power to ground.

    Verify that all datasheet parameters are being met. Voltage and current limits for pins, input voltage limits and ramp rates.

    Regards,
    Cody

  • 0 in reply to Cody Watkins
    Expert 1055 points

    Dear Watkins,

    Your intuition is absolutely right! I checked the voltage VDD and its 2.6V. Nevertheless, I used the same schematic used on the F28379D launchpad. I dont have any clue why the o/p voltage of TPS62080 IC. I have attached the power supply section of the schematic. I have attached the F28379D launchpad schematic too which has been the reference for our design. Refer page no 12/30 in document.

    https://www.ti.com/lit/ug/sprui77c/sprui77c.pdf?ts=1672895201599&ref_url=https%253A%252F%252Fwww.google.com%252F

    Regards,

    Rajesh BN.

  • +1 in reply to beesetty rajesh
    TI__Mastermind 41335 points

    Rajesh,

    did you assemble this board? And can you confirm that all ESD precautions were observed while handling the devices?

    This sounds like a prototypical ESD damage case leading to a low resistance path from power to ground. If you have correctly followed the LaunchPad's schematic then there shouldn't be a schematic bug.

    1. verify that you didn't accidently populate a resistor in a Decoupling cap's location, or some other simple assembly mistake.
    2. Verify that the schematic doesn't have a power to ground short
    3. Desolder the c2000 device and see if the VDDIO rail returns to 3.3V
      1. IF this happens there was likely ESD damage to the C2000 device during or after assembly. Replace the C2000 following ESD procautions and everything should be fine.

    Regards,
    Cody