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Maximum Input Voltage for UCC25600EVM Evaluation Board

Saad Pervaiz
Prodigy 120 points
Other Parts Discussed in Thread: UCC25600EVM

Hi,

I am planning on using UCC25600EVM evaluation board as a second stage of my converter. The power stage preceding the LLC outputs a DC voltage that varies between 380 to 430 V. User guide for UCC25600EVM states that the maximum input voltage can be upto 405 V. Can you kindly tell if the input voltage range for the evaluation board be increased to 450 V. In that case, what components will be required to be replaced.

Secondly, can you tell the bandwidth of the feedback loop that regulates the output voltage at 12 V.

  • 0
    TI__Expert 3095 points

    Hi Pervaiz Saad,

    Thank you for your interest in this product.

    Please be aware that  EVM modules are intended to demonstrate functions of the part in a lab environment. If you wish to use this module as part of a device or product then you must ensure it is suitable and meets all the required standards.

    I had a quick look and cannot see any component ratings that will limit the input voltage range to 405V. The LLC converter design is, however, optimised to work within a narrow range of input voltage levels. You may find that higher input voltages will result in reduced operating efficiency and perhaps even difficulty regulating or burst operation at relatively high power. I suggest you give it a try and see if it provides operation that is acceptable for your requirements.

    If it is not acceptable you may need to adjust the LLC converter design to make it better able to cope with the wide input voltage range. Please take a look at this application note for help with modifying the LLC design. http://www.ti.com/lit/an/slua733/slua733.pdf. This application note is intended for use with a different part, but can be used to assist in the design of any LLC converter stage.

    A Bode plot is given in the design guide for the Eval board. It looks to me that the loop bandwidth is of the order of 700-1000Hz.

    Thanks

    Joe Leisten