![]() ![]() It will continuously overheat and shut down, cool then start again, overheat and shut down again etc which causes non-recommended thermal fatigue. If you short the output then it will try to dissipate 50W? It doesn't have a max current-limiting rating. Even a TO-3 package would need either a huge heatsink or a pretty big one plus a fan because its max dissipation is 67W. With a perfect huge heatsink and a high velocity fan, the TO-220 package will get too hot and cause shutdown above 25W. With an output voltage of 5V and a current of 2A then the LM350 will try to dissipate 40W. ![]() With a 5V output it will have 20V across it which is exactly at the typical dropout point of a graph in its datasheet. Then you gamble about how much or how little its current-limiting will give you when its output voltage is turned down. You allow some ripple voltage to keep the size of the main filter capacitor to be reasonable, then the average input voltage is 25V. Its minimum input voltage is 3V higher than its output voltage so it doesn't dropout.
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