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UCC2818A-Q1: Loop control parameter calculation

Part Number: UCC2818A-Q1

Hi Team, 

Customer calculate the loop parameter based on datasheet, , it works fine at Vin 85-270V. While at Vin=75V or below, with full load the loop is not stable. Is there any action customer could take to realize low line full load stable operation?

Customer still are not confident in low voltage (70-75V) operation, since not described in datasheet, while end OEM needs this low voltage operation. 

Best Regards,

Gene