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TPA3110D2-Q1; soldered percentage at thermal pad

Dear all,

Could you teach me following question?

■QUESTION 1

How soldered percentage do we have to attach at thermal pad?

My customer can not guarantee 100% soldering at thermal pad.

Therefore, if you recommend something about thermal pad, could you teach me?

By any chance, is there formula to calculate soldered percentage we have to?

■QUESTION 2

What is happen if we do not solder thermal pad?

For example...theta-ja will get higher to **℃/W?

I appreciate you could teach me the trade-off against no soldered.

Best regards,