I am planning to use HF500-30 IC in one of my design. How to determine the Rsense value on source pin.
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For calculating Rsense, first you need to calculate the Ton (equations 7 and 8 in datasheet) . Then use Sramp (given on page 6 of datasheet) as 25mV/V and please use VILIM as 1V ( on page 6 of Datasheet) . The according to equation 14 , Vsense = 0.95VILIM – ( Sramp* Ton) . Then use equation 8 and 9 to calculate Ipeak. Assume Kp=0.8. Now you have calculated Vsense and Ipeak. Use that to calculate Rsense using equation 15 which is Rsense = Vsense/Ipeak.
Typo correction: Sramp is 25mV/usecs. Since the units of Sramp are in millivolts per microseconds, please be sure to calculate Ton in microseconds to the keep the integrity of units (dimensions). Also I would encourage you to do worst case calculations at min and max of all the datasheet values and not just at nominal or typical value.
Received your schematic but no BOM or Transformer datasheet. I will need that also.