as the heat increases current also increases

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   I am using lnk 419 for 28w constant current power supply ,the supply is inside the plastic casing. whats the problem is current is increasing from 620ma to 680ma within 3 hour. I think it is because of the heat inside the is there any option to avoid this kind of problem.  



Each component has different temperature characteristics which may contribute to the increase in output current.

LNK-PH itself has TC variation. One way to limit the rise is to make sure you have adequate heatsink on LNK-PH to manage device temperature better. You may also set the output current lower at room temperature so that the steady-state output current is lower.