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LM22678: Feed Back Control is not working while increasing the Input Voltage

Part Number: LM22678

Dear Sir/Mam,

We are using the Part for LM22678TJE-ADJ/NOPB 5V generation. While giving the input at 12V, output voltage generated for 5V. But if iam increasing the input voltaeg from 12V to 28V means output voltage also increased. So Feed back not controlled the output voltage.

Designed parameters are given below

L=6.8uH

C=100uF

Feed Back Voltage = 1.285V