DESCRIPTION
Demonstration circuit 491 features the LTC1923EUH
thermoelectric cooler (TEC) controller. The LTC1923EUH
comes in a small 32-lead QFN package (5mm by 5mm).
Since the switching frequency of the circuit is 1MHz,
small size inductors and capacitors are used as output
filters. The main components are within a small assembly
area about 0.75” by 0.5”. DC491 provides a complete
temperature control solution for TEC based temperature
control of fiber-optic lasers. Laser temperature may be
controlled at temperatures above or below ambient with
set point stability typically well within 0.05°C over widely
varying ambient temperature. Temperature set point is
established with a potentiometer. Considerably more
detail relating to TEC temperature control issues is available
in LTC Application Note AN-89, A Thermoelectric
Cooler Temperature Controller for Fiber Optic Lasers.
This publication should be reviewed before demo board
results are evaluated.
Design files for this circuit board are available. Call
the LTC factory.