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UCC28711 -- EVM output current

Rob Rodrigues
Mastermind 19780 points
Other Parts Discussed in Thread: UCC28711, UCC28710, PMP8477, UCC28711EVM-160, UCC28700

Hi Team,

I have an application where I want to use the UCC28710D to create a 5-V, 2.3-A rail.  The UCC28710D doesn't have an EVM, and I have seen the suggestion to replace the UCC28711 on an UCC28711EVM.

 

Ultimately, I'd like to simply output 2.3-A from an EVM that uses UCC28710 or UCC28711.  Is there a way to modify the EVM or would changing the device be sufficient?

 

Regards,

  • 0
    TI__Mastermind 34465 points

    The UCC28711EVM-160 is rated at 5V 1A so you will not be able to get 2.3A out of it. The PMP4351 and the PMP8477 reference designs are rated for 5V,2A .

    These designs use the UCC28700 which is very similar to the UCC28710. You should be able to modify either of these to use the UCC28710 and change the max output current to 2.3A

  • 0 in reply to John Griffin1
    TI__Mastermind 19780 points
    Hi John,

    Thanks for the input. How would the design be changed to support this higher output current?

    Regards,
  • 0 in reply to Rob Rodrigues
    TI__Mastermind 34465 points
    Hi Rob,
    You can increase the output current from 2A to 2.3A by decreasing the resistor on the CS pin of the UCC28700 proportionally. The new resistor would be about 85% of the original. The power losses will increase and it important to monitor the temperature, especially on the secondary side rectifier. Both designs use the SBR10u45 Schottky rectifier which is rated at 10A but it may be necessary still to add more copper heatsinking around the part.
    Regards,
    John