Hello,
Calculated Power dissipated from a LM317 voltage regulator (9V output, 0.5A load current) = 4.5W
Ambient temperature, 30 degrees
Max. junction temp. (from data sheet) 125 degrees
125 - 30 = 95
Junction-to-ambient thermal resistance = 95/4.5W = 21 degrees/Watt
With a Heatsink added, specified thermal resistance of 3.3 degrees/Watt:
3.3 x 4.5W = 15 degrees.
30 + 15 = 45 degrees = heatsink temperature = correct?
Calculated Power dissipated from a LM317 voltage regulator (9V output, 0.5A load current) = 4.5W
Ambient temperature, 30 degrees
Max. junction temp. (from data sheet) 125 degrees
125 - 30 = 95
Junction-to-ambient thermal resistance = 95/4.5W = 21 degrees/Watt
With a Heatsink added, specified thermal resistance of 3.3 degrees/Watt:
3.3 x 4.5W = 15 degrees.
30 + 15 = 45 degrees = heatsink temperature = correct?