Other Parts Discussed in Thread: TL431
At first, the output voltage of the design is 12V, and the load can work normally. However We change the output voltage to 18V (adjust the resistance of TL431 to 5.1k and 33.2 k), the switch power supply is 50V. We can see it normal without load.
Take load, just start normally (connect 90 ohm resistance, current 0.2 A, voltage 18V), after a few dozen seconds, then current is 0, the chip already burnt bad.What's the reason? How to solve it?
