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UCC28740D schematic review (5V@3A)

Duy Le
Prodigy 10 points
Other Parts Discussed in Thread: UCC28740

Hi All,

We are designing power boards with following requirements:

1) Input: 85-265VAC

2) Output: 5V@3A

We follow TI reference design of UCC28740 and our schematic is shown as below:

VENUS_WIFI_IOT_BRIDGE_SCH_REV17_18NOV15_1020_2TI.pdf

Please help review this schematic. Our aim is to reduce size of this PCB so it will be great if you could help replace some big components with smaller ones. Also, below is ref design of UCC28740 for your reference:

tidrgc2.pdf

Best Regards,

Duy Le

  • 0
    TI__Expert 4015 points

    If you want to reduce the size, I would recommend the following steps. Depending on your design constraints they may or may not all be feasible or work well.

    • Try removing the Common mode choke (L44) and increasing the size of the Y-cap. Maybe around 1nF
    • You could possibly use a smaller transformer if the deisgn is not very low profile. For 15W and E16/8/5 might suffice.
    • R4 and R338 can probably be reduced, are two 1210 resistors required?
    • It might be possible to reduce the size of the output capacitors depending on your minimum load, maximum load step and ripple current requirements
    • Depending on your output voltage ripple specification, L11 may not be required.

    Hope this helps.

    Thanks

    Billy