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TPS55340: TPS55340 Reduction Issues

Part Number: TPS55340

Dear E2E :

I use tps55340 for boost  Circuit.  
Input voltage: 12V  ; Output voltage: 24v  Iout=1.5A(max) 
I do test about the basic function, it,s OK. But the reduction Beyond the limit.
so i reduce the switch frequency, But it seems not work.
thanks very much.


Schematic  for Webench,  Something need to be improved or not?

BOT: INPUT Cap not close to the IC.