I see R6 as a 10 Ohm resistor? So, I guess that limits it to 247.5mA through the TL431... I still see smoke in his future.You missed R6 which limits the maximum circuit current to 25mA.
please simply post the image without embedding it in a word .doc file; you can paste a screen print into ms paint, then crop it and save it as a .png file. .png files require no other software than a browser to read, and are very compact.
you have some very large problems with this schematic.
250v across 1k ohms (r5) is 250ma and 50 watts of power dissipation.
I can only guess that you are wanting to regulate the voltage across r3, but most of your circuit components would disappear in a puff of smoke if you tried building it.
v1 is far too high of a voltage for the circuit.
Reduce it to 36v, as that is the absolute maximum for the tl431.
you need to tell us more about your source voltage. Is that 250vdc batteries, rectified mains, the output from a regulated power supply?
Is r3 going to always be a fixed 20k ohm resistive load, or will it change?
I am not certain what your plans are for this circuit.
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by Jake Hertz