LNK304GN led driver

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Hello!
Could you help me wiht my led design, please? My circuit diagram is on the picture.

My parameters are:
LinkSwitch-TN: LNK304GN
Rfb = 300
Rbias = 2k
Rsense = 22
Csense = 10u
Co = 10u
L = 2.8 mH
My load is one led chain (12 leds, 2.86V for led). Need current 100 mА. So, output voltage should be Vo = 34,3 V.

My problem is that if I put Rsense = 22 Ohm, I got current Io = 90 mА and the circuit works fine; But when I put Rsense = 20 Ohm for current 100mA, my circuit has failure and led chain starts blinking with near 800 ms period (it seems LNK304GN restarting). What is wrong with my circuit?

with respect,
Oleg

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led design.jpg103.57 KB