The LDC-3916558 TEC Controller Module module is intended to be used within a LDC-3916 16-channel or LDC-3908 8-Channel Laser Diode Controller Mainframe. The module contains a single three ampere independent temperature controller that drives a thermoelectric cooler (TEC). The temperature controller features a bi-polar current driver that works with most TEC modules to deliver precise temperature control over a wide range of temperatures. The temperature controller operates using thermistor type temperature sensors only. The LDC-3916558 features a TEC module voltage measurement, selection of thermistor current range, and control loop gain adjustment from 1 to 127.