Reply to thread

Hi,

you gave no working conditions and no specifications.

I guess you want it to output 52.5V at the collector of the BJT ... but to what? What is the load and what is it´s operating range?

In case it draws more than 1mA .. the voltage will break down.

In case it draws 0.75mA .. the voltage at the TL431 cathode is expected to be more than 42V .. which already violates the specifiation!

Klaus