My Application circuit like this
I tested the voltage of IN1N,OUT1,and use the pin TMPGD drives a LED,
V(IN1N)= V(1N1P),V(OUT1)= V(IN2P),As
I changed the valtage of TempSet V(IN2P),Vout1 changed,according to the fomula,Rth changed,
but V(1N1N) still equals to Vref/2,As the voltage divider,
V(IN1N) =Vref* (Rth+Rx)/(R+Rth+Rx)
V(IN1N) not changed,Rth Neither.
So it is contradict.I can not understand.
Besides,when I tested the voltage of IN1N,the LED always twinkle.
Thanks for your explaination.