Description

This application report presents a thermoelectric cooler system consisting of a Texas Instruments TMS320F2812 digital signal processor (DSP) and DRV592 power amplifier. The DSP implements a digital proportional-integral-derivative feedback controller using an integrated 12-bit analog-to-digital converter to read the thermistor, and direct output of pulse-width-modulated waveforms to the H-bridge DRV592 power amplifier. The system presented provides up to 6.1 watts of heating or cooling to the laser mount, although the DRV592 amplifier is actually capable of delivering up to 15 watts when configured appropriately. The closed-loop TEC system is seen to achieve ±0.0006°C temperature accuracy, depending on the needed operating temperature range, with a step response settling time of 14 to 16 seconds. A complete description of the experimental system, along with software and software operating instructions, are provided.