ILX Lightwave LDT-5525 – Thermoelectric Temperature Controller

The ILX Lightwave LDT-5525 is a precision microprocessor-driven thermoelectric temperature controller engineered for accurate thermal management of laser diodes and optoelectronic components. It combines high analog stability with intelligent microprocessor control to deliver stable, repeatable temperature regulation across demanding applications. The unit maintains short-term stability better than ±0.004°C, making it ideal for systems requiring wavelength and power stability.

Technical Specifications Temperature Control

Control Range: −99.9°C to 199.9°C

Setpoint Resolution: 0.1°C

Setpoint Accuracy: ±0.2°C (thermistors, AD590, LM335)

Short-Term Stability (1 hour): < ±0.004°C

Long-Term Stability (24 hour): < ±0.01°C

Control Algorithms: Smart Integrator, Hybrid PI

Operating Modes: Constant Temperature, Constant Resistance, Constant Current TEC Output

Bipolar Current Source

Compliance Voltage: 6 V @ 4 A (up to 8 V typical)

Maximum Output Current: 4 A

Maximum Output Power: 24 W (into 1 Ω load)

Ripple/Noise: < 1 mA rms

Current Limit Range: 0–4.0 A with ±50 mA accuracy Temperature Sensors Supported sensor types include NTC thermistors (2-wire), IC sensors (AD590, LM335), and RTD sensors. Usable thermistor range spans 25–450,000 Ω. The controller applies 10 µA or 100 µA sensing current to thermistors, 8 V bias to AD590 devices, and 0.6 mA bias to LM335 sensors. Calibration options include two-point calibration for IC sensors and Steinhart-Hart (2 constant) adjustment for thermistors. User Interface Microprocessor-controlled front panel with SELECT and SET controls plus rotary knob for temperature setpoint, sensor calibration, current limits, temperature limits, and loop gain adjustment. Bright green 4-digit LED display supports selectable readout modes for temperature, resistance, and current. USB interface enables remote calibration and control. Power & Environment Available in 120 V and 220 V configurations. Mains supply voltage must remain within ±10% of nominal. Operating temperature: 0°C to 40°C. Storage/transportation: −40°C to 70°C. Maximum altitude 3000 m, humidity < 80% RH (non-condensing). Class I grounded equipment; Pollution Degree II; Installation Category II.

Key Features

Sub-0.004°C short-term stability for wavelength and power lock

Smart Integrator and Hybrid PI algorithms for adaptive control

Bipolar 4 A output with low noise performance

Multiple sensor compatibility with flexible calibration

Microprocessor intelligence with intuitive front-panel operation

Typical Applications

Laser diode testing and characterization

Laser diode frequency stabilization

Compatibility & Integration Thermal management for NTC thermistors, AD590 and LM335 IC sensors, and RTD temperature sensors. Remote operation via USB interface. Indoor use only.