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LM3409HV PMOS发热问题求指教

Other Parts Discussed in Thread: LM3409HV

板子焊好了用LM3409HV,输入12v-32v. LED灯电压9v 电流2.2A. 电感22uH(10*10 TDK)COFF脚是470p+15k. PMOS管TPCA8104.现在问题是当电压调到30v时PMOS管发热严重(12v-22v发热不严重)。求指点!!!