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TPS54334: Output issue

Umamaheswara Rao Maddula
Prodigy 20 points
Part Number: TPS54334


Hi,

We are using the TPS54334 in our design and the output of the IC is defined for 3.3V. When i measure the output it is showing as 4.6V. 

Below voltages are observed at the respective pins.

Input voltage 5V.

Enable pin voltage is 3.9V

Voltage @ boot pin is 5.7V

Voltage @ comp pin is 0.7V

Voltage @ Vsense is 1.2V

When i observed the Vsense voltage is 1.2V. It is high compare to the actual value of 0.8V for 3.3V output voltage. I believe based on this value switching frequency has to change but i am seeing any change in the frequency.

 

Could you please let me know possibility of malfunctionality of the device. 

Regards

Uma M

  • 0
    TI__Expert 7520 points

    Hi Uma M

    I would like to confirm some details here:

    1. What is the load of the converter? Would you please disconnect the load of the application and use an external e-load to check again?

    2. Would you mind sharing me your layout? I guess there was some noise here.

    3. Would you please help me capture some waveforms using scope: SW voltage, input voltage, output voltage and inductor current?

    Thanks.

    BR

    Ruby