• Low Noise, Low Drift Current Controller
• Maximum Controlled Laser Current: 3 A
• Precise Thermoelectric Cooler (TEC) Controller
• Full PID Feedback Loop with Independent P, I, and D Settings
• External Modulation
• Extensive Laser Protection
• Constant Current (CC) and Constant Power (CP) Modes
• For all Laser Diode and Monitor Photodiode Pin Configurations
• Standard Pin Connectors for Easy Integration into Systems

The board level controllers of the ITC133 combines a low noise, low drift current source with a precise TEC controller on a single eurocard-sized board for easy integration into OEM applications. The analog interface offers easy access to set parameters and read-outs. The ITC133 controller is designed to be integrated into products or systems where a semiconductor laser operation requires excellent stability of the laser emission.

The ITC133 controller supports operation in both constant current (CC) and constant power (CP) modes, all laser and monitor diode polarities (CG/AG) are supported as well. To ensure the best possible performance, laser diodes are driven with fixed ground offering significant advantages regarding noise, transient suppression and stability. Laser injection current can be modulated externally. The temperature controller features a full PID feedback loop with independent P, I, and D settings for optimization of temperature settling characteristics. All standard temperature sensors (AD590, LM335, thermistor) are supported. The ITC133 OEM board offers full connection access via a standard 64-pin PCB connector. This connector provides all output signals as well as analog control inputs, power supply connection and outputs to connect laser and monitor diodes, temperature sensor and thermoelectric cooler element. In addition, a 15 pin D-Sub connector allows connection of the laser to the ITC133 board using a single cable.

The ITC133 has a laser current control range of 0 to ± 3 A and a maximum power of 18 W.

• Current Control
• Control Range of Laser Current: 0 to ± 3 A*
• Compliance Voltage: > 4 V
• Setting Accuracy / Repeatability (Full-Scale): ± 2% Typ. / ± 0.1%
• Noise (10 Hz to 10 MHz, RMS): < 25 µA
• Drift (30 min, 0 to 10 Hz, Typ.): < 300 µA
• Temperature Coefficient: < 50 ppm/°C
• Power Control
• Control Range Photo Diode Current: 5 µA to 2 mA
• Accuracy / Repeatability (Full-Scale): ± 2% Typ. / ±0.1%
• Photodiode Reverse Bias Voltage: 0 V or 5 V
• Current Limit
• Setting Range: 0 to > 3 A
• Setting Accuracy / Repeatability (Full-Scale): ± 2% Typ. / ± 0.1%
• Analog Modulation Input
• Small Signal 3 dB-Bandwidth, CC: DC to 20 kHz
• TTL Modulation Input
• Rise/ Fall Time: < 100 µs
• General Data
• Supply Voltage/ Current: ±12 to ±15 V / 3.1 A
• Dimensions (W x H x D): 100 x 42 x 160 mm (Eurocard)

• Temperature Control
• Trim Potentiometers (1-Turn): P-, I- and D-share
• TEC Output
• Control Range of TEC Current: -3 A to +3 A*
• Compliance Voltage: > 6 V
• Maximum Output Power: 18 W
• Noise and Ripple: < 3 mA
• Thermistor Temperature Sensors
• Control Range: 0.1 Ω to 80 kΩ
• Setting Accuracy (Full-Scale, Typ.): ±2%
• Temperature Stability Typ.: < 2Ω
• IC Temperature Sensors AD590, AD592, & LM335
• Control Range: -20 °C to 80 °C
• Setting Accuracy (Full-Scale, Typ.): ±2%
• Temperature Stability Typ.: < 0.004 °C
• TEC Current Limit
• Setting Range: 0 to ≥ 3 A
• Accuracy Typ.: ±5%
• Temperature Control Inputs
• Input Coefficient Thermistor: 16 kΩ/V
• Input Coefficient IC-Sensor: 20 °C/V
• TTL Control Input: TEC ON
• Measurement and Control Outputs
• Measurement Accuracy Typ. (Load > 500 kΩ): ±2%

*The total combined current for the ITC133 is limited by the total thermal dissipation loss. Optimized cooling by fan or bigger heat sink allows 3 A LD and 3 A TEC at the same time provided the power supply provides 6.1 A

(All technical data are valid at 23 ± 5 °C and 45 ±15% rel. humidity)