4
Power Rating
Determination Calculator
Double click on table to enter variables in second column
F1 = Expected power dissipation
F2 = 1+X/100
F3 = -2.743X3 + 4.603X2 + -2.504X + 1.658
F4 = -3.5(10)-10(x)3 + 1.237(10)-6(X)2 – 1.555(10)-3(X) + 0.9928
F5 = 5.18(10)-7(X)3 – 1.377(10)-4(X)2 + 0.01437X + 0.6992
F6 = {if X<70, 1.5  } else = {0.007737X + 0.996}
F7 = X/100
Power rating needed = 2 x F1 x F2 x F3 x F4 x F5 x F6 x F7
* Where ‘X’ represents the respective parameter entered in the cell just before it