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Wednesday, November 11, 2009

Linear TEC Driver Circuit

This circuit is a driver circuit for thermo electric cooler that is becoming popular because of its robustness and maintenance free characteristic. This driver is capable of delivering ±2A into a TEC. This circuit operates on a single +5V supply and drives the TEC in the most preferred “constant-current” mode. This is the figure of the circuit.

This TEC driver amplifier is a voltage-controlled current source. Constant current drive eliminates the effect of thermal “back EMF” on current through the TEC under dynamic temperature control conditions. Constant-current drive also assures that TEC drive current is independent of production variations in TEC junctions or long-term aging.

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