FL500 WAVELENGTH | Alldatasheet

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Technical content

www.teamWavelength.com FL500 Single 500 mA or Dual 250 mA Channel Laser Diode Driver DATASHEET AND OPERATING GUIDE

ORDERING INFORMATION

FL500 500 mA Laser Diode Driver FL591FL 500 mA Laser Diode Driver and Board FLEXIBILITY YOU NEED The FL500 Laser Diode Driver comes in a small SMT package that is reflow process compatible. The FL500 is ideal for driving low power laser diodes. It operates from 3 to 11 V, so it is compatible with Li+ battery operation. This makes it practical for handheld devices. It can be configured as two totally independent 250 mA drivers or a single 500 mA driver. It is compatible with Type A or Type B laser diodes.

FEATURES

  • Small Package: 0.75” x 0.45” x 0.255”
  • Low Cost
  • Brownout Protection
  • 12-Pin, SMT Package, Reflow Compatible
  • Slow Start Laser Diode Protection
  • Drive Up to 500 mA Output Current
  • Can be configured as two 250 mA drivers
  • Voltage Controlled Setpoint
  • TTL Compatible Shutdown Pin
  • Adjustable Current Limit on Evaluation Board
  • Adjustable Current Range Output
  • 500 kHz sinewave Constant Current Bandwidth (100 kHz square wave)

CONTENTS

ELECTRICAL SPECIFICATIONS 5 SAFETY INFORMATION 7 OPERATING INSTRUCTIONS 8 ADDITIONAL TECHNICAL INFORMATION 11 TROUBLESHOOTING 12 MECHANICAL SPECIFICATIONS 13 CERTIFICATION AND WARRANTY 14 e PAGE Pb RoHS Compliant © October 2025 EASY INTEGRATION The FL500 allows for quick and easy operation in Constant Current (CC) mode. For simple CC mode operation the only components that are required are a power supply, an analog control voltage, your laser and optional filtering circuitry. For additional features, including current limit and photodiode feedback for Constant Power operation, use with the FL591FL driver board. LEADING EDGE APPLICATIONS The FL500 is commonly used in hand-held, portable, and space constrained applications. Small and light weight, the FL500 is ideal for airborne applications, spectroscopy systems, and the dual-channel output is perfect for sighting-and-detection applications. A Laser Type B Laser Type

Table 1. Pin Descriptions input for this pin is +3 to +11 Volts DC. It is compatible with Li+ batteries. here. Do not use for high current ground return. higher voltage here will produce more current through the laser diode. GND 5 Ground for setpoint inputs Low Current, Low Noise ground for use with VSET1 & VSET2. higher voltage here will produce more current through the laser diode. Tie to laser diode cathode for individual drive operation (250 mA max). Tie to LDC1 for parallel operation up to 500 mA. capacity is greater, but higher current produces offsets and higher noise. Use for ground connection of VS power supply. Tie to pin 10 (also PGND) if laser diode current exceeds 125 mA. Tie to laser diode cathode for individual drive operation (250 mA max). Tie to LDC2 for parallel operation up to 500 mA. capacity is greater, but higher current produces offsets and higher noise.

PARAMETER SYMBOL MIN TYP MAX UNIT ABSOLUTE MAXIMUM RATINGS Supply Voltage (Voltage on Pin 1) VDD +3 +11 * Volts DC Output Current (See SOA Chart) IOUT 500 mA Power Dissipation, TAMBIENT = +25ºC [1] PMAX 2 Watts Operating Temperature, case TOPR - 40 +85 ºC Storage Temperature TSTG - 55 +125 ºC Weight FL500 0.08 oz PARAMETER TEST CONDITIONS MIN TYP MAX UNIT CONSTANT CURRENT CONTROL Short Term Stability, 1 hour TAMBIENT = +25ºC 35 40 ppm Long Term Stability, 24 hours TAMBIENT = +25ºC 50 75 ppm CONSTANT POWER CONTROL Short Term Stability, 1 hour [2] 0.019 % Long Term Stability, 24 hours [2] 0.011 % OUTPUT [3] Current, peak, see SOA chart Per channel 245 250 252 mA Current, peak, see SOA chart Two channels operated in parallel 495 500 505 mA Compliance Voltage, Laser Diode Load Full Temperature Range, IOUT = 500 mA VDD - (0.5 x VSET) V Rise Time IOUT = 500 mA 300 nsec Fall Time IOUT = 500 mA 300 nsec Bandwidth (Constant Current) Sine Wave 500 kHz Bandwidth (Constant Current) Square Wave 100 kHz Delayed Start 100 msec Slow Start ramp rate 15 mA / msec Depth of Modulation 100 kHz sine wave 99 % Transfer Function - VSET to IOUT Two 250 mA drivers 0.125 A / V Transfer Function - VSET to IOUT One 500 mA driver 0.25 A / V POWER SUPPLY Voltage, VDD 3 11 * V Current, VDD supply, quiescent 2.2 2.7 4.6 mA VS, Maximum to LD Anode 20 * V *The FL591 Evaluation Board limits the input voltage to 9 V. Note [1]. Maximum Power Dissipation is 1 Watt per channel. When configured as one driver, maximum power dissipation is 2 W. Note [2]. Constant Power Control is available with the FL591FL diode driver and board as well as the FL500 with the LDTC0520/1020 combination boards. Note [3]. Limit is fixed at 500 mA (250 mA per channel). The Evaluation Board circuitry adds a variable limit circuit. © 2025 www.teamWavelength.com 5 FL500 LASER DIODE DRIVER

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS INPUT Offset Voltage, initial, IMON Pin 2, TAMBIENT = +25ºC, VCM = 0 V 2 mV Bias Current (based on input Res of op amp) Pin 2, TAMBIENT = +25ºC, VCM = 0 V 10 15 nA Common Mode Range Pin 2, Full Temp. Range 0 VDD V Common Mode Rejection, Setpoint Full Temperature Range -16 64 dB Power Supply Rejection Full Temperature Range 60 dB THERMAL Heatspreader Temperature Rise TAMBIENT = +25ºC 43 ºC / W Pin Solderability - Hand soldering Do not exceed 260ºC for more than 10 seconds Reflow Solderability Do not exceed 250ºC for more than 30 seconds NOISE Noise & Ripple (RMS) IOUT = 100 mA, 100 kHz bandwidth 3 µA Leakage Current (when using the FL591 circuitry) VSET = 0 V VSET = 1 V VSET = 2 V 10* 100 150 µA µA µA *For FL500 drivers built before June 2021 and before lot number 2119070, typical leakage current is 50 µA. ELECTRICAL SPECIFICATIONS CONTINUED © 2025 www.teamWavelength.com 6 FL500 LASER DIODE DRIVER

  • FL500 Driver
  • Digital Voltmeter, 4-½ digit resolution recommended
  • Test load for configuring the driver [optional]
  • Laser Diode
  • Connecting wires
  • Power Supply STEP 1 - CHOOSE ONE OR TWO POWER SUPPLIES, VOLTAGES SOURCES Configure the power supply to provide +3 to +11 VDC. Connect the positive terminal of the power supply (V S) to Pin 1 and the negative terminal to Pins 9 and/or 10 (PGND) or Power Ground depending on the FL500 operation explained in the following steps below. Only ground V S to Pin 2 if it is also grounded to Pins 9 or 10 (see page 9). VS powers the laser diode current source (or test load), and VDD powers the control electronics. Power the laser diode from VDD by connecting VDD where V S is shown. For lower noise operation, separate VDD from V S. VS can be up to 20 V. At this level, however, too much power can be dissipated in the FL500 causing permanent damage. Calculate the power dissipated in the FL500 using the Safe Operating Area (SOA) Calculator online prior to using a VS more than 2 V greater than the voltage dropped over the laser diode. A maximum power dissipation of 1 W per source (2 W for paralleled operation) must not be exceeded. The minimum VS is determined by the voltage drop across the laser diode and half the setpoint voltage. VSMIN = VLD + VSET/2 + 25 mV (across FET). Ground this power supply at Pins 9 & 10 (PGND). Using Pin 2 could damage the FL500. Example VSMIN: VLD = 1.2 V VSET = 1.5 V STEP 2 - CREATE A SETPOINT Connect a voltage source to Pins 4 (VSET1) and/or Pins 6 (VSET2) and Pin 5 (GND) to create a setpoint for the current output. Check the specific configuration step below for more detailed instructions. Pick the one of the following three wire configurations (step 3) that best fits your operation of the FL500. STEP 3 - CONFIGURE THE WIRING OPTION 1: OPERATE AS TWO INDEPENDENT DRIVERS Connect the positive terminal of a power supply to Pin 4 (VSET1) and the positive terminal of another power supply to Pin 6 (VSET2). Connect both negative terminals to Pin 5 (GND). The power supplies do not need to be tied together. The transfer function for individual VSETs (1 & 2) is 0.125 A / V. The FL500 contains circuitry for two 250 mA drivers. Connect one test load (laser diode) to Pins 11 & 12 (LDC1) and Pin 1 (VDD). Place the other test load on Pins 7 & 8 (LDC2) and Pin 1 (VDD). Make sure VS is grounded at Pins 9 & 10 (PGND). Pin 2 (GND) will also be tied to this ground. The RESET minimum current is 10 µA, and the leakage current is less than 1 mA. The FL500 has a known leakage current when disabled equal to the following magnitude: IOUT(LEAK) = VIN 20 kΩ This is well below 1 mA, and the usual leakage expected is 100 µA. See Figure 7 for typical operating schematic.

Figure 7. Single Supply Voltage Operating Two Independent current of the FL500 to 250 mA by using just one channel.

driver), use the same circuit to also connect to VSET2. feedback, use the circuit below from the FL591 schematic. Figure 10. Typical Delayed / Slow Start Response

PROBLEM POTENTIAL CAUSES SOLUTIONS Driver will not switch on Improperly configured power supply Carefully check the wiring diagram according to page 8 and page 9. If operating the FL500 with the Evaluation Board, see the FL591FL Datasheet for details regarding power supply. Output will not enable ENABLE Pin not held low Refer to the RESET/ENABLE control (Pin 3) in Table 1 on page 4. Laser output power too low in Constant Current mode Laser voltage setpoint too low Increase the setpoint by increasing the voltage at Pin 4 & 6 (VSET1 & VSET2). VSET1 & VSET2 may be tied together if operating in parallel. Laser current limit too low The current limit is fixed at 500 mA (250 mA per channel). The Evaluation Board circuitry adds a variable limit current. Laser driver is compliance limited Check the laser diode specifications to determine the forward voltage (VF). Make sure that the FL500 is not compliance limited. Refer to the Electrical Specifications table on page 5. If the driver is compliance limited, VDD may need to be increased. Verify that the FL500 will be operating within the Safe Operating Area if VDD is increased. Driver will not operate in Constant Power mode Not available with the standalone driver Constant Power Control is available when the FL500 is used with the FL591 (Evaluation Board) as well as the LDTC0520/1020 combination modules. Transfer functions are inaccurate Operating as two 250 mA drivers instead of one 500 mA driver or reverse The Transfer Function for operation as two 250 mA drivers is 0.125 A / V. The Transfer Function for operation as one 500 mA driver is 0.25 A / V. This is seen in the Electrical Specifications table on page 5. © 2025 www.teamWavelength.com 12 FL500 LASER DIODE DRIVER

FL500 IS REFLOW PROCESS COMPATIBLE. All dimensions are ±5% 0.75” [19.1 mm] 0.047” [1.19 mm] 0.125” [3.2 mm] 0.45” [11.4 mm] 0.48” [12.2 mm] 0.040” [1.02 mm] 0.55” [13.8 mm] 0.26” [6.5 mm] 0.035” 0.89 mm 0.45” [11.4 mm] 0.100” [2.5 mm] 0.085” [2.2 mm] 0.100” [2.5 mm]0.018” [0.46 mm] 0.75” [19.1 mm] PCB FOOTPRINT © 2025 www.teamWavelength.com 13 FL500 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: FL500-00400 REV. DATE CHANGE H June 2013 Updated Noise & Ripple specifications I Mar. 2014 Clarified reflow compatibility J Dec. 2014 Updated to fully reflow compatible K Nov. 2015 Updated leakage current specification L Oct. 2020 Updated to new format, added current limit and PD feedback M Jan. 2025 Updated pin and reflow solderability specifications N July 2025 Updated max power supply voltage WAVELEnGTH ELECTRONICS

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Bozeman, Montana 59715 406-587-4910 (tel) 406-587-4911 (fax) Sales & Tech Support sales@teamwavelength.com techsupport@teamwavelength.com © 2025 www.teamWavelength.com 14 FL500 LASER DIODE DRIVER