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TPS62825AEVM-126: HICCUP short-circuit protection Anomaly

Robert Ortega
Prodigy 20 points
Part Number: TPS62825AEVM-126
Other Parts Discussed in Thread: TPS62825A,

Tool/software:

Hello,

I am using the TPS62825AEVM-126 to verify a 0.75V design and for the most part, the design works up until about ~700mA. It appears the hiccup short-circuit protection feature is being activated. According to the datasheet, the TPS62825A is rated for a max output current of 2A so i believe this hiccup feature should not be activated until it is close to the max output current rating. 

Here are the changes I've made to the evaluation board.

  • C6 = 10uF
  • C1 = 0.1uF
  • C5 = 10uF
  • R1 = 2.61k
  • R2 = 10K
  • C3 = 1200pF
  • +1
    TI__Mastermind 21580 points

    Hi Robert,

    Can you add a small wire loop next to the inductor and probe the inductor current with a current probe on the scope. You can if the peak value of inductor current is at current limit or not. The average value of the inductor current during switching should be the output load current. So you then know how much load is on your output. 

    Since you changed the input caps, you can also probe the input cap closest to the IC to see if the input voltage is stable or oscillating. It could also be that there is a UVLO event on the input and the device is shutting down in case the input cables are not thick enough and there is a larger voltage drop across them with load.

    best regards,

    Varun