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UCC14240EVM-052: How can I disable the -5V negative output rail on the EVM?

SS
Prodigy 75 points
Part Number: UCC14240EVM-052

Hi. 

I just need a single 20V output for my application. Is there a way I can disable the -5V output out of the converter?

Thanks.

  • 0
    TI__Genius 14580 points

    Hello,

    Yes, UCC14240 can have a single output. Please refer to calculator on ti.com, and it provides how to modify the board. 

  • 0 in reply to Sean Xu
    TI__Mastermind 30995 points

    You can also check the app note here and pay attention to the configuration below. The key point is that on the EVM, you will need to remove the FBVEE resistors and short the FBVDD to FBVEE (best to make the short directly at the IC pins by dropping a solder connection across pins 33 to 34). In the schematic below, the RMIL (R1) is shown connected to VDD but you can simply remove RLIM and leave the pin floating for single output configuration.

    Steve