I'm using one of these set as a constant current regulator. The
datasheet says 2.2A max, internally limited by thermal shutdown.

If I try to pass more than that, despite it being very well heatsinked,
will the component shut down completely or will it just refuse to pass
more current? If i shuts down completely it will mess up my timing
issues, and I'll use a resistor. If not I'll not use the res to grab
every last ounce of power it can pass.

Cheers
J