Floating the LT3012B for an output voltage of 65V. I'm working on a design to supply approximately 65V of bias to a large detector array. The design uses the LT8361 boost converter to step up 24V to 66V to 67V. The boost circuit is based on figure 22 of the data sheet. I want to follow the converter with a linear regulator and the LT3012B can only output up to 60V, so looking to float the regulator up about 15V. See the attached circuit and LTSpice DC Simulation. Circuit uses a constant current diode and 15V zener to set the reference level for the transistor and sets the regulators GND pin at about 15V. I set set R1 at 25K to reduce the value of R3. Are there limits on these values? The simulation looks okay. I don't need high accuracy for the 65V output and a 1 or 2 volts drop out across the regulator is okay.The load current is less than 200mA. Is this a viable approach? Other ideas would also be appreciated.
