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Trouble with LTC3895 - it yields several kHz of switching frequency instead of 100kHz or so. Feedback works OK.

Question asked by Brobro on Feb 23, 2018
Latest reply on Feb 24, 2018 by Brobro

I'im designing a buck , 400W converting 32Vdc to 28Vdc. The circuit works almost well, but instead of 100kHz or so of the switching frequency I got only audible 3..5kHz, depending of the load. Output voltage is maintained well, so feedback works properly. Main inductance is 5uH wound on the MPP toroid with appr. 1 inch diameter.

Why the reality differs so much from Ltspice simulation ?