TPS54140: Low efficiency issue

Yang Wu

Part Number: TPS54140

Hi Team,

My customer has a low efficiency issue (< 50%), could you help check the SCH and PCB to identify problems? thanks!

Yang

0 Ambreesh Tripathi over 6 years ago

Yang ,

At what current the Efficiency is calculated ? What is the ESR of output inductor? How is the Switch node looking ?

---Ambreesh

0 Yang Wu over 6 years ago in reply to Ambreesh Tripathi

Hi Ambreesh,

I found that it customer did some mistakes on measurements and calculations when I went to the filed...

The circuit worked fine. (79% efficiency @ 36V Input & 11.5V 366mA output)

thanks a lot.

Yang

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