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Fail in design to TPS54240 from Webench

Ruben Tello
Prodigy 30 points

I have followed the design from WEbench step by step but it doesn't work when i ask it more than 0.8A, Any idea about what is my fault?  Thanks in advance

  • 0 in reply to Ruben Tello
    TI__Mastermind 35165 points

    Hi Ruben,

    What input voltage and output voltage was this designed for? Also, did you put the circuit on an EVM or a custom pcb?

    If you can get a screen capture of what the output voltage and PH pin is doing above 0.8A this can also help to debug.

    Best Regards,
    Anthony

  • 0 in reply to Anthony F
    Prodigy 30 points

    Hello Anthony,

    First of all, thanks for the answer. Well, the yellow signal is the output, as you can see, it is oscillating at 850mV . The green one is the PH signal. I get similar result with 12V, 14V and 16V output, i mean, i test the circuit with 28V in the input. I change the necessary components to 12V at 850kHz, to 14V at 800kHz and to 16V at 800kHz, i change the value of the resistor and capacitors as Webench tells me, and i get similar result. If i don't put load, i get the 12V, 14V and 16V. If i put a load, in the moment which i overcome 0.8A...........it gets down. In theory, the circuit has to give me 12,14 or 16V at 2A. Above all i want to remember you that i changed the resistors, capacitors, diode and bobine,ok? I mean i follow the advise of Webench. So.... i am not sure if there is any limitation that webench doesn't know.

    At the other question, i use a custom pcb which follows the same print that EVM.

     

    Thanks in advance and best regards