hi,
If you require a direct buffered connection to the CPO, it is as I stated in my first post.
In order to create a buffered output from the CPO, the buffer must have a low output impedance and be capable of driving a load that requires more current than the CPO itself can provide.
This means the buffering OPA must be powered with a voltage higher than the 36Vdc output from the CPO. This higher voltage power supply will be source of the higher current flowing into the low output impedance load.
An alternative would be to use a high resistance voltage divider connected from the CPO's 36Vdc output and 0V. Choose resistance values that will not load the CPO output to heavily.
For example, let the divider be 1Megohm and a 100K [ approx 10:1 reduction] say 3.6Vdc
Use a very high input impedance OPA and connect the junction of the resistors to the Non Inverting input of the OPA, the OPA would be configured as non inverting buffer, gain = 1.
Do you follow OK.??