STK7560 Series
Assuming power dissipation in each element as follows :
PT1 for power transistor of OUTPUT 1
PF1 for FRD of OUTPUT 1
PT2 for power transistor of OUTPUT 2
PF2 for FRD of OUTPUT 2
Total power dissipation Pd in the IC and heat sink thermal resistance θca are :
Pd= (PT + PF1) + (PT2 + PF2) [W]
θca= Tc – Ta [°C/W]
Pd
where Tc : Case temperature=105°C, Ta=Ambient temperature
Junction temperature in each element is :
Tj= Pd × θjc + Tc [°C]
No.1773–10/13