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2022-09-24 23:33:15
LTC1923 - High Efficiency Thermoelectric Cooler Controller
The LTC®1923 is a PWM thermoelectric cooler (TEC) or heater application requiring either unidirectional or bidirectional drive circuits. All necessary control circuitry and two sets of complementary output drivers are integrated into the LTC1923 as a full-bridge driver, providing an efficient means of bidirectional TEC current flow. Accurate temperature control loops to stabilize laser diode temperature systems are easily implemented, except for just a few external components. Typical temperature setpoint accuracy is 0.1°C achieved with the LTC1923. Adding an instrumentation amplifier front end allowed the setpoint to stabilize to 0.01°C. Some features independently adjustable heating and cooling pulse-by-pulse current limit, current soft-start control startup, output slew rate control to reduce system noise, differential current sense and voltage amplifier mainframe and auxiliary circuits to protect the laser and provide redundant system monitor.