I am working on constant current source that can deliver up to 20 mA for 5 kohm load. So I need to generate at least of +100 V to be able to sink 20 mA through the load. Can anyone recommend a low profile solution? The project needs a bipolar voltage source so I am planning to use a isolated DC to DC converter and use two of these circuit to get positive and negative rails. If there is a chip that can generate both rails it is even better.