Adjustable Output current LED Driver

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I want to design new LED DRIVER having output voltage 29-36 Volt and output current Variable from 500  mA to 2 A  based on design mention in RDR-290,but the major issue is the size of the driver,it must be be can I Make my design compact with very low component count.please help me to make the design compact and cost effective.How can I design the required heatsink for both LNK PH & output diode.

You can try redesigning it using LYTSwitch-4 which will reduce the transformer size as it operates in higher switching frequency. Heatsink design is simply knowing your power dissipation ang selecting or designing a heatsink with your required thermal resistance. You can find alot of information on heatsink design on the web in case you havent designed one yet.