Flickering when i reduce current sense resistance

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My driver is AC/DC,when i reduce the current sense resistor in order to increase the current,it starts flickering.Can someone help me out?

If you are using PIXls to design the LED driver, I suggest you review the spreadsheet to find out if there are warnings on the remarks as you modify the current sense resistor value. I suspect one or two parameters need to be optimized but since I don't have info on your design, I can only speculate.
Please try to increase the output capacitance, or use a larger PI device so that the current limit is higher.