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220VAC to 24VDC @2.5A small footprint design

Shawn Nguyen
Prodigy 10 points
Other Parts Discussed in Thread: UCC28730, UCC24650, LM5021, UCC28700, LM5023

Hi,

I need help to design a high volume consumer product that needs small footprint power converter with the following spec:

-  Input: 220VAC @ 50Hz

-  Output: 24VDC (+/- 5%)  @ 2.5A

I have used TI Webench power designer to screen out the potential designs, but they all have large footprint.

Your help is appreciated.

Thanks.

  • 0
    TI__Mastermind 30380 points

    Hello Shawn,

    Thank you for your interest in TI controllers.

    I suggest to consider the UCC28730 off-line flyback controller along with its companion IC the UCC24650 "wake-up" output monitor.
    The UCC28730 requires a low number of components, while the wake-up IC will help minimize the size of the output capacitor and still achieve very good transient response.  

    Other devices that may also be considered are the UCC28700, -704, -710, -740, -780, -600, -630 families, and LM5023 and LM5021. 
    All are suited to your input and output voltages and power level.  Each has one or more features that the others do not have, so selection involves comparison of features to narrow down the candidates for your application.

    The Webench tool will list the footprint areas of each component in the design file, but it cannot account for how those components might be arranged on a circuit board.  For example, most designs place large through-hole components on the top-side of a pcb and place all the SMD parts on the bottom. This makes the pcb assembly much smaller than if all of the parts were layed out on only one side of the board.  Therefore, the Webench footprint summation will appear to be a pessimistic prediction of board size.

    Regards,
    Ulrich