DN1220

™ DATA SHEET DN1220 SUBMINIATURE THERMOELECTRIC COOLER CONTROLLER General Description The DN1220 is a subminiature Bipolar Temperature Controller for Thermoelectric Coolers (TEC) used in fixed temperature OEM applications. The device is designed to operate with a Negative Temperature Coefficient (NTC) thermistor that senses the temperature of the object attached to the TEC. Temperature is set with a user selected resistor. Temperature stability of 0.01°C is achieved by the linear Proportional Integral (PI) control loop of the DN1220. Proportional gain and integrator time constants are set independently with resistors. No external integrator capacitor is needed. These parameters can be optimized to minimize temperature overshoot and stability. In addition, the maximum cooling and heating current supplied to the TEC can be adjusted independently from 0 to 2 amperes with two resistors. An evaluation kit is available that contains the DN1220, a fan cooled TEC, and an aluminum cold plate (with imbedded thermistor) that is attached to the TEC. The evaluation kit operates on a 12 VDC power supply. Temperature of the cold plate can be changed from 0 to 60 °C with a variable resistor. The TEC is mounted on a socket so that it can be easily removed. Features Proportional and Integral Control Gain and Integrator Time Constants set with Single Resistors. No External Integrator Capacitor Needed. Single Power Supply Operation. +5 to +12 Volts D.C. ± 2 Ampere Drive Capability ...