The circuit I have built is attached, it uses LM393N single power supply.
* Note: The BJT npn transistor is built inside the comparator it selt and I just placed it in the LTSpice comparator one to make it functions like the real one.
My problem is that I could not calculate the resistance value for the hysteresis. I set reference voltage to 2.275 V because I need the fan to operate at 40 degrees Celsius. the hysteresis should be between 40 and 35 degrees Celsius. I could not figure out the calculations.
The temperature sensor is AD22100 which is linear and the output equation for this sensor is: VOUT = (V+/5 V) × (1.375 V + 22.5 mV/°C × TA)
V+ in this case is 5 VDC and TA= 40 Degrees Celsius.
Please advice in how to calculate the resistor values to get hysteresis between 35 and 40 degrees Celsius.
* Note: The BJT npn transistor is built inside the comparator it selt and I just placed it in the LTSpice comparator one to make it functions like the real one.
My problem is that I could not calculate the resistance value for the hysteresis. I set reference voltage to 2.275 V because I need the fan to operate at 40 degrees Celsius. the hysteresis should be between 40 and 35 degrees Celsius. I could not figure out the calculations.
The temperature sensor is AD22100 which is linear and the output equation for this sensor is: VOUT = (V+/5 V) × (1.375 V + 22.5 mV/°C × TA)
V+ in this case is 5 VDC and TA= 40 Degrees Celsius.
Please advice in how to calculate the resistor values to get hysteresis between 35 and 40 degrees Celsius.