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TPS65000: using TPS65000 in MCU's power supply application have damage issue.

WU YISYUAN
Expert 2165 points
Part Number: TPS65000

hi,

     I used TPS65000 in MCU's power supply application have damage issue.

    My MCU's time sequence is 1.2V-->1.8V-->3.3V

 so, I used TPS65000 to provide my MCU's power supply. the schematic as below:

MCU's recorder through connect  P5 to MCU, I has measure GPIO voltage is 3.5V.

but the IC was damage in MCU burning record, I have some question as below:

1. Is it a risk that the En_DCDC, En_LDO1, and En_LDO2 of the TPS65000 are directly connected to Vin 5V?
2. Can LDO1 delay the effect of DCDC and LDO2 power up by adding a RC circuit to En_LDO1?
3. Will the emulator's GPIO 3.5V produce voltage inversion after the 3.3V of the control board is generated. Damage to LDO1?

4. Is TPS65000 have OCP protection function?

Btw, my out waveform as below:

CH1=Vin, CH2=3.3V, CH3=1.8V, CH4=1.2V.

What is the cause of this?

thanks.

 

  • 0
    TI__Expert 8730 points
    Hi,

    I have assigned your request to responsible Applications Engineer and we will get back to you as soon as possible.

    Regards,

    Murthy
  • 0
    TI__Genius 10885 points

    Specifically which IC was damaged?

    1. No

    2. Regulators are enabled independently, only the behavior of PGOOD would be affected.

    3. I'm not sure I understand this question completely. An external source of a higher voltage applied to the LDO output is not recommended and could lead to damage.

    4. There are internal current limits in case the outputs are shorted to GND.

    Best Regards,

    Rick S.

  • 0 in reply to Richard Solarski
    Expert 2165 points
    hi Richard,
    only TPS65000 damage.
    some damage IC is no output, some IC is 4.7V out(it like Vin=Vout).

    thanks.
  • 0 in reply to WU YISYUAN
    TI__Genius 10885 points
    Hi Wu,

    From your screenshot, it seems that the regulators are at their target level, while experiencing periodic noise. Because the noise is common to all regulators simultaneously, I would recommend investigating the layout for the AGND pin, ensuring it is isolated from the return path of other high current supplies, specifically ones that are operating at the same time as the occurring noise.

    An output regulating close to the input voltage could indicate a damaged feedback connection, where the control loop is constantly attempting to achieve the targeted output voltage.

    Best Regards,
    Rick S.