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UCC2870x / accuracy of voltage regulation

Other Parts Discussed in Thread: UCC28700EVM-068


Now I'm promoting the UCC2870x that is controller with primary-side regulation to our customer. Then they are asking about accuracy of voltage regulation. In UCC28700EVM-068, it state min/max of Vout and line and load regulation. Please let me ask following two question about them.

1, How do you guarantee the min/max of Vout? Which parameter or components do affect for min/max of Vout?
2, Do customers need to consider the deviation of line and load regulation in addition to min/max of Vout?

Best Regards,