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TPS63802: TPS63802 failure modes & protection methodologies

Leo Chow
Expert 3120 points
Part Number: TPS63802

Hi,

I would like to understand further on the behavior of this buck-boost converter under fault condition. Assume i'm facing fault condition as below:

- Vin range: 2.7V - 4.4V

- Vout target: 5V

- Output shorted to Input, and Output possibly shorted to >5V supply at the same time.

 

Understood that there are built-in safety feature in the regulators. But I would like to get a better definition on failure mode for this device under this circumstances.

Regards,

Leo

  • 0
    TI__Guru 65170 points

    Hello Leo,

    If you short VOUT to VIN and at the same time VOUT to a voltage above 5V, the result is difficult to predict because the voltage on the IC is then dependent which source is stronger, the input or the one that is above 5V. So which voltage will be seen on the output of the converter is not defined.

    If the output is shorted to VIN only, the device will most probable deliver as much current as possible to bring the output up to the target voltage. As the input voltage is below the output voltage, for the converter it looks like a pre-biased load and it will try to bring it up to 5V.

    If the output is shorted to a voltage above 5V, the device will stop switching if power save mode is enabled. If power save mode is disabled, it will try to bring the output voltage down to the set voltage and deliver current to the input.