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LM338 high watt output

Other Parts Discussed in Thread: LM338

Hi,

I'm a FAE to support Samsung. My customer want to use LM338 for below condition.

Input : 24V, Output : 15V, 3A / Power dissipation : (24V-15V)*3A = 21W

I have some question.

Q1. Is it usual case for LM338 application? I think the power dissipation is too high.

Q2. I want to calculate junction temperature. Do I using that formula? Tj = Ta + (Theta(JA)*Pdiss)