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Constant Current Source

Other Parts Discussed in Thread: TPS84620

There is this post “TPS84620 used as LED driver” Although I do not need to drive LED’s the question is essentially the same.

 The target devices I have picked are the: TPN78000/78020/78060  These are all voltage adjustable regulators.

There is a resistor to ground that sets the voltage output. I have voltage feedback that I could apply to the part.  Some parts will allow this, some will not.

If I can do this please let me know what the Vref is so I can make sure I design the circuit correctly.  Note that it would be great if the voltage was less than 1.0 Volts, but I can pretty much deal with anything.

Does anybody have any ideas that my help. 

I am using a linear devices and a TIP35 is just disipating way to much power and I really do not have a way to get rid of the excess heat, and I would really like to use a switching device.