HVDR (High Voltage Discrete Regulator)

[analag]

How can I improve this?

 

[Jonte Knif]

Could you post some essential parameters for that design? Without the RC-network. Is that not stable with smaller resistor? 33 Ohms is quite a lot?

Not that I can suggest any improvements, just out of interest. I'm happy with my very simple design which is nice except in terms of supply regulation  :

 

[Samuel Groner]

In short:

* common-source instead of common-drain output transistor is easier to compensate and shows less output impedance dependence on output current
* perhaps bootstrap D1 from the regulator output instead of the CCS
* cascode Q1/Q2 for better PSRR
* the differential pair is easily biased with just a resistor as there is no CM swing

Also see discrete_series_voltage_regulator_r1.pdf

Samuel

 

[analag]

Made the suggested changes and simplified the design as well.