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Load Response of LDC501 TEC Controllers Rev B. Revised Oct 2012 Figure 1 Thermal load response test setup An important property of a TEC controller is its Tests were done to show the TEC's response to dynamic response to a thermal load change. For thermal load changes. Figure 1 shows the test example, when the laser current changes, the setup. heating capability changes, which in turn causes temperature to change. The TEC controller will A 10 resistor is located on a TEC cooled metal sense this change and make a correction to bring plate. A current change in the 10 resistor will temperature back to the set value. cause a thermal load change. A NTC thermistor (MC65F103C) is used in the control loop. This The Stanford Research Systems' LDC500, thermister has a 10k resistance at 25C. LDC501 and LDC502 controllers have an Auto tuning capability to find PID parameters which The LDC501 was set to 25.000