User's Manual

INTRODUCTION
Product Overview
2 LDT-5100
CHAPTER 1
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Product Overview
The LDT-5100 Temperature Controller is a device which, when powered by the
appropriate supply, measures the temperature dependent resistance of a
thermistor. Using this resistance as feedback, it stabilizes temperature by driving
current to a thermoelectric (TE) module. The TE drive for the LDT-5100 is bipolar
(positive current to cool; negative current to heat). This allows for highly stable
temperatures and fast settling times. Desired temperature (thermistor resistance)
is set by adjusting an on-board trimpot or by connecting an external reference
resistor (for a more precise setpoint).
Thermoelectric Temperature Control
More information about controlling temperature with thermoelectric modules is
available in ILX Lightwave Application Notes, which are available at
www.ilxlightwave.com.
External power supplies are required to power the LDT-5100’s control and
monitoring circuits. Please refer to the specifications on page 3 for power supply
requirements.
Voltage outputs are provided for thermistor resistance and TE module current
monitoring. Status monitors for open thermistor, TEC open, and output on/off are
provided as an open collector outputs for logic compatibility with other
instructions. Pads for LEDs are located on the LDT-5100 PCB that correspond to
the three status monitors.