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TPS54335A: TPS54335A cannot pass simulation

Arabella Zhang
Intellectual 2880 points
Part Number: TPS54335A

Tool/software:

Dears,

The customer is currently using TPS54335 in a machine vision camera project. Recently, two cameras burned out. When the customer checked the problem, he found that the current circuit could not pass the simulation.

1. The customer calculated the compensation circuit according to the formula in the manual. Is the simulation inaccurate?

2. According to the formula, the value of R4 is only related to the switching frequency of 1.5MHz, the output voltage of 15V, and the output capacitance of 22μF. The calculated value is 37.4K. However, the simulated value is only about 15K. Why is this?

Below is the schematic：

Please help analyze the reasons, thank you very much!

  • 0
    TI__Mastermind 27296 points

    HI Arabella

    two cameras burned out-- did TPS54335 burn out? Did customer measure is there any short-circuit between the pins  like Vin , SW, GND ?  

    What's the load and can you please share the part number of the L8?

    Thanks and best regards.

  • 0
    TI__Mastermind 27296 points

    Hi Arabella

    According to the formula, the value of R4 is only related to the switching frequency of 1.5MHz, the output voltage of 15V, and the output capacitance of 22μF. The calculated value is 37.4K. However, the simulated value is only about 15K. Why is this?---The Cout customer chose is <22uF(please check the capacitance derating under the DC bias).  What's the Cout in the WEBENCH simulation ?

    Thanks and best regards.

  • 0 in reply to Gui He
    TI__Mastermind 27296 points

    Hi Arabella

    Is the burn out issue still there, I will close this thread for now and let us know if there are other questions.

    Best regards.