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LTC3890 does not give me enough current output

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I designed a step down DC/DC voltage controller using LTC3890. I have an input voltage of 48v, and I want an output 12V, 3A, and an output 5V, 3A. However I can not get that much current. Any ideas? Please see the attahced schematics Thanks for help
 

Hi,
I did never used these IC, but are you sure pls that your Isense resistors are not higher as 10 mOhms, & are the right inductances & PCB layout used?
Has the IC sufficient cooling (trough PCBs copper)?
K.
 

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