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UCC28740EVM-525: Achieve 80W output with UCC28740EVM-525

Part Number: UCC28740EVM-525
Other Parts Discussed in Thread: UCC28740, , UCC24612, UCC28780, UCC28056

Hi,

I'd like to seek your advise on UCC28740
Customer intends to design "80-100W USB Type-C & Type-A Wall Charger"

Specification for flyback controller:
- dual outputs (total ~80W):  12V/5A & 5V/2.1A

He is considering ICE5ASAG from Infineon but we would like him to evaluate UCC28740EVM-525

Below are my questions:

  • Can we use UCC28740 to achieve similiar applicaiton as ICE5ASAG?
  • How to utilize UCC28740EVM-525 to achieve output of ~80W (in terms of surrounding components, transformer winding etc)

if you have better proposal other than UCC28740, please let me know

Thanks!

  • Thanks for your interest in TI here.

    Yes UCC28740+UCC24612 SR controller could be good options here. UCC28740 is a valley switching controller so will be higher efficiency and lower EMI compared to ICE5xSAG fixed frequency controller. UCC28740 also has integrated HV start for fast startup and lower standby power.

    To design UCC28740, it is best to use the excel design calculator on its product page on ti.com. You would design for 12V single output at the total power to calculate inductance and turns ratio and other components and then would just request your xfmr vendor for extra winding for 5V as a cross-regulated winding. you would use the 12V for main opto feedback since it is highest power and then cross regulate the 5V. You may also consider doing 1 output and then having a buck converter for the 5V output depending on regulation requirements.

    You may also consider UCC28780 Active Clamp Flyback and UCC24612 SR controller (both newly released to production) if you are concerned with efficiency or solution size.

    Also-do you require PFC? is this for an external power supply or some other application? If you need Power Factor correction you may also consider looking at UCC28056.

    best regards,
    John