LDDPSERIES WAVELENGTH | Alldatasheet

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Technical content

ORDERING INFORMATION

LDD200: 200 mA Laser Diode Drivers LDD200 1P Type A & B lasers LDD200 2P Type C lasers LDD400: 400 mA Laser Diode Drivers LDD400 1P Type A & B lasers LDD400 2P Type C lasers Accessories LDDEVALP Evaluation Board WCB201 3 pin laser diode connection cable (for 9 mm laser diodes) VERSATILITY The LDD P Series of laser diode drivers come in two compact models to work with all laser diode/photodiode configurations. Each model is available in 200 mA and 400 mA versions to best fit your laser diode requirements. PRECISION & HIGH PERFORMANCE When it is essential to have high performance in your application, these low noise drivers offer excellent current stability in Constant Current mode. Precisely control the laser diode setpoint current with the on- board Output Current Adjust trimpot or via a remote voltage to the modulation input. The modulation input’s small signal 3 dB bandwidth is DC to 2 MHz. EASY INTEGRATION Measure laser diode current from a buffered monitor output. Optional evaluation boards are available to assist with operating any LDD P series module. LASER SAFETY FEATURES In order to protect laser diodes, all LDD P series drivers are equipped with current limit protection, as well as slow start circuitry. Current limit protection ensures that the diode will not be overdriven, and the slow start circuitry protects the diode from thermal shock that can damage the laser at turn on. FEATURES AND BENEFITS

  • Up to 400 mA current drive capacity
  • +5 to +12 V single supply operation
  • 12-turn trimpots control Current Setpoint and Limit Setpoint
  • Operates all low power laser diodes
  • Modulation up to 2MHz
  • Slow start circuitry
  • Buffered measurement output
  • Small size
  • 8-pin DIP package
  • Low noise operation
  • Constant Current mode operation

CONTENTS

ELECTRICAL SPECIFICATIONS 5 SAFETY INFORMATION 7 OPERATING INSTRUCTIONS 8 WIRING INSTRUCTIONS: LDD EVALUATION BOARD 14 ADDITIONAL TECHNICAL INFORMATION 19 TROUBLESHOOTING 25 MECHANICAL SPECIFICATIONS 27 CERTIFICATION AND WARRANTY 28 e PAGE Pb RoHS Compliant © June 2025 406-587-4910 www.teamWavelength.com LDD P Series Low Noise Laser Diode Drivers DATASHEET AND OPERATING GUIDE

1 CURRENT FEEDBACK Connect to Pin 7 as shown in the wiring diagram. 2 CURRENT MONITOR Measures laser diode current. 0 to 2.5 V range. 3 MODULATION INPUT Inverting modulation input. 0 to 5 V range. Must be shorted to pin 4 (GND) to properly configure the onboard trimpots. 4 GND Power supply and monitor common connection. 5 LD CATHODE Laser Diode Cathode. 6 LD ANODE Laser Diode Anode. (Pin 6 internally shorted to Pin 8). 7 FEEDBACK IN Connect to Pin 1 as shown in the wiring diagram. 8 V+ Power supply voltage connection. (Pin 6 internally shorted to pin 8). Supply range: +5 to +12 VDC. Table 1. Pin Descriptions LDD 1P (Types A & B lasers) 1 CURRENT FEEDBACK Connect to Pin 7 as shown in the wiring diagram. 2 CURRENT MONITOR Measures laser diode current. 0 to 2.5 V range. 3 MODULATION INPUT Inverting modulation input. 0 to 5 V range. Must be shorted to pin 4 (GND) to properly configure the onboard trimpots. 5 LD ANODE Laser Diode Anode. 7 FEEDBACK IN Connect to Pin 1 as shown in the wiring diagram. 8 V+ Power supply voltage connection. Supply range: +5 to +12 VDC. Table 2. Pin Descriptions LDD 2P (Type C lasers) Table 3. Transfer Functions for LDD P Series Laser Diode Drivers

© 2025 www.teamWavelength.com 5 LDD P SERIES LASER DIODE DRIVER ELECTRICAL SPECIFICATIONS PARAMETER SYMBOL LDD200 LDD400 UNIT NOTE ABSOLUTE MAXIMUM RATINGS Supply Voltage VDD +5 to +12.5 VDC Voltage on Pin 8 Compliance Voltage VDD - 1.4 VDC Output Current ILD 200 400 mA See SOA Chart Power Dissipation [1] PMAX 1 2 W TAMBIENT = 25°C Operating Temperature - Case [1] TOPR 0 to +50 °C TAMBIENT = 25°C Storage Temperature TSTG -40 to +125 °C Weight < 1 oz Soldering Temperature [2] 260°C (10 secs) [1] Maximum Operating Power derates above 25°C. The online Safe Operating Area (SOA) Chart includes this derating. www.teamwavelength.com/support/design-tools/soa-ld-calculator/ [2] Not compatible with aqueous cleaning processes. PARAMETER LDD200 xP LDD400 xP UNIT 1P For Laser Type A or B 2P For Laser Type C CONSTANT CURRENT CONTROL Current Limit Range 0 - 200 0 - 400 mA Temperature Coefficient < 100 ppm / °C Long Term Stability, 24 hours [3] < 50 ppm Noise and Ripple (RMS) [4] < 5 μA MODULATION Input Impedance 1 MΩ Depth of Modulation (at 10kHz) [5] 90 % Bandwidth, small signal sine wave 3dB 2 MHz Modulation Input Damage Threshold < -0.5 or > VDD + 0.5 V POWER SUPPLY Supply Quiescent Current 50 mA Power Up Trip Point [6] 4.9 V Power Down Trip Point [6] 4.2 V MONITOR ACCURACY Setpoint vs. Monitor Accuracy < 5 % Warm-up to Rated Accuracy 1 hour [3] Stability tests were performed in an ambient air environment. [4] Laser diode forward current noise. Test was performed by measuring the AC voltage across a 50Ω metal film resistor in series with a laser diode. [5] As square wave modulation frequency increases, the peak-to-peak output amplitude diminishes. For example, these graphs show the waveform shape at 10Hz and 10kHz. Depth of modulation continues to decrease after 10kHz. 0 mA Full Current 100% Depth of Modulation at 10 Hz 100 % 0 % 90% Depth of Modulation at 10 kHz 90 % 95 % 5 % [6] The LDD P Series has internal control circuitry which turns the output on and off depending on the voltage at pin 8. When the voltage reaches the power up trip point, the module soft starts the laser diode. When the voltage reaches the power down trip point, the module shunts current around the laser diode, powering it down in a controlled fashion.

© 2025 www.teamWavelength.com 6 LDD P SERIES LASER DIODE DRIVER ELECTRICAL SPECIFICATIONS – CONTINUED SYMBOL PARAMETER TEST POINTS TEST CONDITIONS* TYPICAL TIMING CHARACTERISTICS tDELAY Time delay between Power ON and Laser Diode current start Load LDD400 1P - 1.0Ω LDD400 2P - 1.0Ω 27.5 ms 27.5 ms tRISE Square Wave Response, 10% to 90% Load LDD400 1P - 1.0Ω LDD400 2P - 1.0Ω 120 ns 220 ns tFALL Square Wave Response, 90% to 10% Load LDD400 1P - 1.0Ω LDD400 2P - 1.0Ω 120 ns 220 ns tSOFT START Soft start minimum (current setpoint 10% full scale) Load LDD400 1P - 1.0Ω LDD400 2P - 1.0Ω 140 ms 180 ms Soft start maximum (current setpoint 100% full scale) Load LDD400 1P - 1.0Ω LDD400 2P - 1.0Ω 300 ms 300 ms *LDD200 P model results are comparable. See Test Setup on page 21 for wiring diagram used.

© 2025 www.teamWavelength.com 7 LDD P SERIES LASER DIODE DRIVER SAFETY INFORMATION SAFE OPERATING AREA — DO NOT EXCEED INTERNAL POWER DISSIPATION LIMITS Before attempting to operate the LDD P Series driver, it is imperative that you first determine that the unit will operate within the Safe Operating Area (SOA). Operating outside of the SOA may damage the laser and the LDD P. Operating outside of the SOA will void the warranty. To determine if the LDD P Series driver is suitable for your application and if it will be operating in the safe range, consult the instructions for calculating the Safe Operating Area online: www.teamwavelength.com/support/design-tools/soa-ld-calculator/ SOA charts are included in this datasheet for quick reference (page 24), but we recommend you use the online tools instead. To ensure safe operation of the LDD P driver, it is imperative that you determine if the unit is going to be operating within the internal heat dissipation Safe Operating Area (SOA). If you have any questions about the Safe Operating Area calculator, call the factory for free and prompt technical assistance. THEORY OF OPERATION The LDD P Series drivers are controlled current sources: they deliver the current commanded by the setpoint. The current source continually monitors the actual output current, compares it to the setpoint, and adjusts the current if there is a difference between the two signals. It may be useful to remember that you do not directly set the drive current setpoint; instead, you adjust a voltage signal that represents the output current. The voltage and output current are related by a transfer function that varies by driver model number. The setpoint voltage is adjusted with the onboard trimpot or by an external input that subtracts from the onboard setpoint. The adjustable current limit is set using an onboard trimpot. As current is driven through the load, there is a voltage drop across the load because of the impedance. As the current increases, the voltage drop may increase to the point that it reaches the Compliance Voltage limit of the current source. Once that occurs, the current source is no longer able to increase the current driven to the load even if you increase the setpoint. The LDD P driver includes features that help protect your laser and make the driver more versatile in a wide array of applications:

  • Output slow-start ramps the current to setpoint.
  • Current limits prevent too much current from reaching the laser diode.

© 2025 www.teamWavelength.com 8 LDD P SERIES LASER DIODE DRIVER OPERATING INSTRUCTIONS The LDD P Series Laser Diode Drivers are designed for stable, low noise operation. The power supply you select will directly affect the noise performance of the driver. We recommend using a regulated, linear power supply for optimum performance. Depending on your requirements, you may be able to use a switching power supply. Each case must be evaluated independently because a switching power supply will affect noise, transient, and stability performance. The LDD P Series can be purchased with the LDDEVALP series evaluation kit for easy initial operation. LASER SAFETY ISSUES ATTENTION: If you plan to operate the LDD P with any Wavelength temperature controller, you may need to use separate power supplies. If the thermoelectric cooler or thermistor is connected to the laser diode, please contact the factory for technical assistance. ATTENTION: Exceeding the maximum specified operating current (I OP MAX ) will damage your laser diode. Become familiar with the LDD P Series module operation and the exact specifications of your laser diode before attaching it to the LDD P module. Seek assistance from someone with experience working with laser diodes if you have not operated one before. ATTENTION: The following instruments may cause momentary opens, shorts, or impedance changes that will damage a laser diode if attached to the output of a laser diode driver. 1. A voltmeter across the laser diode. 2. An oscilloscope across the laser diode. 3. A current meter in series with the laser diode. All measurements made with these instruments on the output should be made with a simulated load attached and not a laser diode. OPTIONAL: If laser diode and photodiode are isolated (Type B Laser Diode), short the laser diode anode to the photodiode cathode. The LDD P Series laser diode drivers require the photodiode be connected to the laser diode. NECESSARY EQUIPMENT The following equipment is the minimum necessary to configure the LDD P for basic operation:

  • LDD P controller
  • Digital voltmeter, 4-½ digit resolution recommended
  • Test load for configuring the driver
  • Laser diode, mount, and optional temperature control system
  • Connecting wires
  • Power supply
  • LDDEVALP and soldering iron (optional) SAFE OPERATING AREA AND THERMAL DESIGN CONSIDERATIONS SOA charts are included in this datasheet for quick reference, but we recommend you use the online tools instead. www.teamwavelength.com/support/design-tools/soa-ld-calculator/ It is imperative that you verify the unit will operate within the internal heat dissipation Safe Operating Area (SOA). Operating the driver outside the SOA may damage or destroy the driver and/or laser. PREVENT DAMAGE FROM ELECTROSTATIC DISCHARGE Before proceeding, it is critical that you take precautions to prevent electrostatic discharge (ESD) damage to the driver and your laser. ESD damage can result from improper handling of sensitive electronics, and is easily preventable with simple precautions. For more information regarding ESD, see Application Note AN-LDTC06: Basics: Electrostatic Discharge (ESD). We recommend that you always observe ESD precautions when handling the LDD P driver and your laser diode.

diode driver to speed up prototyping. component description can be found. Figure 16. LDDEVALP Component Diagram. For more detail, refer to sections on following pages.

1 LDD Module Laser Diode Driver Component location page 16

2 Enable/Disable wire pads Enable/Disable laser current page 16

3 Jumpers Select LDD P model page 16

5 LED and bias resistor Power ON indicator page 17

6 Measurement wire pads Measure laser diode current page 17

7 MOD INPUT wire pads Connections to optional signal generator page 17

8 Laser diode wire pads Solder laser diode cable to these pads page 17

9 External photodiode wire pads Monitor photodiode current while in constant current mode page 17

10 Op-amp, four resistors, one capacitor For operating LDD 2P in constant current mode page 18

11 Power supply wire pads Connections to power supply page 18

Table 4. Typical Component Functions

The schematic for the LDDEVALP is shown below in Figure 17. Figure 17. LDDEVALP Schematic

Performance Graphs (page 22 and page 23) data were taken using this setup. Figure 35. Testing setup used for Timing Characteristics and Performance Graphs.

© 2025 www.teamWavelength.com 25 LDD P SERIES LASER DIODE DRIVER TROUBLESHOOTING PROBLEM POTENTIAL CAUSES SOLUTIONS Driver will not switch on Improperly configured power supply Carefully check the wiring diagram according to Table 1 or Table 2, depending on model. Pins 3 and 4 not shorted Laser output power too low Laser current setpoint too low Increase the setpoint either by adjusting the OUTPUT ADJUST trimpot clockwise, or by decreasing the signal voltage on MOD INPUT (pin 3). Laser current limit too low Refer to page 11 for instructions on setting the laser driver current limit. Laser driver is compliance limited Check the laser diode specifications to determine the forward voltage (VF). Make sure that the LDD P is not compliance limited. Refer to the Electrical Specifications table on page 5. If the driver is compliance limited, V+ may need to be increased. Verify that the LDD P will be operating within the Safe Operating Area if V+ is increased. Modulation is not working Laser current setpoint is too low Modulation input on the LDD P is accomplished by subtracting from the laser setpoint. If the current setpoint is too low, the modulation can drive the current to the laser to zero. If the current setpoint is set to zero, no modulation is allowed.

© 2025 www.teamWavelength.com 26 LDD P SERIES LASER DIODE DRIVER CABLING SPECIFICATIONS WCB201 – LDD P to 3 PIN (9 mm) LASER DIODE

24 AWG

20” (50 cm) after twisting

© 2025 www.teamWavelength.com 28 LDD P SERIES LASER DIODE DRIVER CERTIFICATION AND WARRANTY CERTIFICATION Wavelength Electronics, Inc. (Wavelength) certifies that this product met its published specifications at the time of shipment. Wavelength further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, to the extent allowed by that organization’s calibration facilities, and to the calibration facilities of other International Standards Organization members. WARRANTY This Wavelength product is warranted against defects in materials and workmanship for a period of one (1) year from date of shipment. During the warranty period, Wavelength will, at its option, either repair or replace products which prove to be defective. WARRANTY SERVICE For warranty service or repair, this product must be returned to the factory. An RMA is required for products returned to Wavelength for warranty service. The Buyer shall prepay shipping charges to Wavelength and Wavelength shall pay shipping charges to return the product to the Buyer upon determination of defective materials or workmanship. However, the Buyer shall pay all shipping charges, duties, and taxes for products returned to Wavelength from another country. LIMITATIONS OF WARRANTY The warranty shall not apply to defects resulting from improper use or misuse of the product or operation outside published specifications. No other warranty is expressed or implied. Wavelength specifically disclaims the implied warranties of merchantability and fitness for a particular purpose. EXCLUSIVE REMEDIES The remedies provided herein are the Buyer’s sole and exclusive remedies. Wavelength shall not be liable for any direct, indirect, special, incidental, or consequential damages, whether based on contract, tort, or any other legal theory. REVERSE ENGINEERING PROHIBITED Buyer, End-User, or Third-Party Reseller are expressly prohibited from reverse engineering, decompiling, or disassembling this product. NOTICE The information contained in this document is subject to change without notice. Wavelength will not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. No part of this document may be translated to another language without the prior written consent of Wavelength. SAFETY There are no user-serviceable parts inside this product. Return the product to Wavelength Electronics for service and repair to ensure that safety features are maintained. LIFE SUPPORT POLICY This important safety information applies to all Wavelength electrical and electronic products and accessories: As a general policy, Wavelength Electronics, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the Wavelength product can be reasonably expected to cause failure of the life support device or to significantly affect its safety or effectiveness. Wavelength will not knowingly sell its products for use in such applications unless it receives written assurances satisfactory to Wavelength that the risks of injury or damage have been minimized, the customer assumes all such risks, and there is no product liability for Wavelength. Examples of devices considered to be life support devices are neonatal oxygen analyzers, nerve stimulators (for any use), auto-transfusion devices, blood pumps, defibrillators, arrhythmia detectors and alarms, pacemakers, hemodialysis systems, peritoneal dialysis systems, ventilators of all types, and infusion pumps as well as other devices designated as “critical” by the FDA. The above are representative examples only and are not intended to be conclusive or exclusive of any other life support device.

REVISION HISTORY

DOCUMENT NUMBER: LDD200P-00400 REV. DATE CHANGE F May 2011 Updated to include R4a and Mod Input Safe Range G December 2011 Updated Type C Laser Quick Connect Diagram H January 2013 Updated Type C Laser Quick Connect I April 2018 Updated to new format. Expanded Constant Current instructions.

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