you should not go above 12 volts because of heatsure you could suck nearly an amp out of it with a 20 volt input, 15 volt drop, but you better have that joker welded (cause solder wont hold) to a brick of metal and a fan on itWell I suspect the regulator will just go into automatic self-protection mode and shutdown well before it tries to unsolder itself. But armageddon stories are so much more fun and it's also fun to scare the newbies. even a TO220 package with a small heatsink is going to start to get a little spicy with only a few hundred mA load and a 12 volt input.
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