Dear Sir,
we uses LM3431 for 3ch LED driver (9/9/8+znear diode). and we found the znear diode vf will increase to 4.2V in worst case or high temperature. it causes LM3431 enter type 2 faults occur (auto restart ) and the LEDs blinking . after checking the CFB pin the voltage is 1.38V (the typical shoule be 1.7V) . May I have your advise which protected Mechanism is? is it current unbalance caused the problem ? Thanks,