I need to design a voltage regulator using N channel mosfet, Can any one share some design Ideal for this, My requirement is given below I tried some circuit but pratically it's not working.
Input = 500 to 700V
Output required : 300V
Load current is 0.8 mA
Resistor value used is 4.7K mosfet : IRFBC20 capacitor not used load : not connected
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Below is my circuit I am getting 0.3V output and my mosfet is heating
Instead of going direct high volt I tested with low volt zener diode and its not working please help me to solve this issue.