I seem to get a odd result?
Here is what im doing
θsa = (Tj - Ta) / Q - (θjc + θcs)
So for my rectifier it follows
(150 - 50) / 8.4W - (1.5 + .09) = 10.31 C/W min ok fine
now another
(125 - 50) / 50W - (4 + .09 + .8) = -2.89 C/W
I keep getting negative numbers?
Does this mean i have no chance of keeping the junction temp below <125oC of this T0220 package?
Cheers peeps
Here is what im doing
θsa = (Tj - Ta) / Q - (θjc + θcs)
So for my rectifier it follows
(150 - 50) / 8.4W - (1.5 + .09) = 10.31 C/W min ok fine
now another
(125 - 50) / 50W - (4 + .09 + .8) = -2.89 C/W
I keep getting negative numbers?
Does this mean i have no chance of keeping the junction temp below <125oC of this T0220 package?
Cheers peeps