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Original question:

UCD3138ALLCEVM150: Error encountered when the firmware is loaded by Digital Power Studio

UCD3138ALLCEVM150: What can I do with this kit other than verify the design?

Bobby Lam95
Intellectual 320 points
Part Number: UCD3138ALLCEVM150
Other Parts Discussed in Thread: UCD3138

Hi,

I bought this UCD3138ALLCEVM150 kit and would like to know if there is any example project that I can use with this kit? What can I do to exercise the functionality of this chip set? Thanks

Bobby.

  • 0
    Intellectual 320 points

    Is the firmware flexible to change the output voltage? Is there any code example to exercise the second and third digital controllers of the chip? Is there any additional information on this evaluation kit? thanks

    Bobby.

  • 0 in reply to Bobby Lam95
    TI__Expert 6680 points

    This is a LLC EVM, you can change its output through GUI, or modify the source code. The source code and the EVM user guide can be download from:

    http://www.ti.com/tool/ucd3138allcevm150

    the GUI can be downloaded from:

    http://www.ti.com/tool/fusion-digital-power-studio

  • 0 in reply to Bosheng Sun
    Intellectual 320 points

    Hi Bosheng,

    Thank you for the information. I downloaded the user guide and reviewed the schematic. The haft bridge circuit that consists of L1, T1, and the combination of C36-C38 + C40-C42 forming the LLC resonance, I assume? Looks like the ratio of T1 can only step down to 25 V max. If I want to obtain the output voltage higher than 25 V say 250 V, I will need to custom design a different transformer. Is there a formula that I can calculate the inductance of the primary coil of the transformer  and capacitance  in order to stay in resonance? I noticed there is a connector J1 External Power Input on Figure 0-1 schematic. There is also U1 (daughter board) sitting on the board and that is another buck converter from 400 V to 12 V. So, what is the current requirement for this 12 V bias source? Thanks

    Bobby.

  • 0 in reply to Bobby Lam95
    TI__Expert 6680 points

    yes, L1, T2 and the combination of C36-C38 + C40-C42 forming the LLC resonant tank.

    Please go to google to search LLC resonant tank design, there are tons of papers

    12V is used for gate driver and controller UCD3138. UCD3138 itself takes maximum 100mA@3.3V. Depends on what kind of gate driver you have, you can calculate how much current you need for 12V. I would say several hundred mA should be enough.