I have a 195-210V(with ripple) power supply and I need a 180V voltage reference.
This is my best idea so far:
Instead of just connecting a resistor and 180V zener diode in series, I do it two times to get better ripple rejection.
(two zener diodes on the left of course have greater total voltage drop that diode on the right).
This solution is still far from ideal, but it's not very bad.
I think there are better solutions, but I couldn't find or invent them myself.
One obvious solution that has better accuracy would be to connect a few smaller voltage reference integrated circuits in series, and final result probably would still have better accuracy than zener diodes. However this is not a good solution since it would require much more compenents, and zener diode solution ony has 5 components.
Are there better solutions that don't require much more components?