Temperature controller

Temperature control is accomplished using the REF-02 +5 V Reference/Thermometer in conjunction with the CMP-02 Precision Low Input Current Comparator. The CMP-02 activates a heating element driver (Q1) whenever the current temperature falls below a predetermined setpoint, which is established by the ratio of resistors R1 to R2. Additionally, the circuit features adjustable hysteresis and operates on a single supply.

The circuit utilizes the REF-02 as a stable voltage reference and thermometer, providing a precise +5 V output that serves as the baseline for temperature measurement. The CMP-02 comparator is configured to compare the voltage corresponding to the current temperature against the setpoint voltage derived from the resistor divider formed by R1 and R2. When the temperature drops below the setpoint, the output of the CMP-02 switches from low to high, activating the heating element driver Q1, which in turn powers the heating element.

The adjustable hysteresis feature is implemented to prevent rapid cycling of the heating element, which could occur if the temperature hovers around the setpoint. By incorporating feedback through additional resistors or potentiometers, the hysteresis can be fine-tuned, ensuring that the heating element remains active until the temperature rises sufficiently above the setpoint before turning off.

The single supply operation simplifies the power requirements of the circuit, allowing it to function effectively in various applications without the need for dual power supplies. This design is particularly advantageous in portable or battery-operated devices where space and power efficiency are critical. The overall configuration ensures reliable temperature control while maintaining ease of use and flexibility in settings.Temperature control is achieved using the REF-02 +5 V Reference/Thermometer and a CMP-02 Precision Low Input Current Comparator. The CMP-02 turns on a heating element driver (Ql) whenever the present temperature drops below a setpoint temperature determined by the ratio of Rl to R2

The circuit also provides adjustable hysteresis and single supply operation. 🔗 External reference