UCC28881: suggest UCC28881 for FSL336LR replacement...

Peter Tseng

Part Number: UCC28881
Other Parts Discussed in Thread: UCC28911

Tool/software:

Hi Team,

I suggest UCC28881 to replace FSL336LR but customer needs a lower Ron solution.

Is there any other suggestion for customer request?

Customer uses Buck topology instead of a transformer due to the size limitation.

I had been suggested UCC287502 but they cannot use it.

Thanks.

0 Ning Tan 4 months ago

The closest one to the FSL device is UCC28911 with lower Rdson than UCC28881 to support higher power.

Please elaborate why UCC287502 is not considered. FSL switching freq is fixed at 50kHz.

0 Peter Tseng 4 months ago in reply to Ning Tan

Hi Team,

Due to size limitations, the customer chose buck topology instead of using a transformer. Therefore, they will not choose TPS287502.

Same reason that UCC28911 will not ok for them.

competitor vs UCC28911:

0 Ning Tan 4 months ago in reply to Peter Tseng

You can configure UCC28911 to high side buck in the left picture. Example design below

0 Peter Tseng 4 months ago in reply to Ning Tan

Hi Sir,

Thanks for your reply!

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