We have found that the NTC pin of the MP2667 has an internal resistance. The resistance between NTC pin and GND are around 40K to 50K (every MP2667 has different value), measured by multi-meter, and all external components are removed while measuring. Because of this internal resistance, the calculated value of R6 is not accurate, it does not cut-off at required temperature.
Also, no matter in what resistance, when the voltage at the NTC pin is less than 35% V_in, MP2667 should cut off, but it doesn’t cut-off.
