FL591 WAVELENGTH | Alldatasheet

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ORDERING INFORMATION

FL591FL Evaluation board with FL500 EASY SETUP SAVES YOU TIME The FL591FL allows you to quickly and easily prototype your laser diode driver system using our popular FL500 laser diode driver chip. The FL591FL can be configured to drive a single 500 mA output, or two 250 mA independent outputs by setting onboard jumpers. The drivers operate in Constant Current or Constant Power modes. Onboard current setpoint and limit trimpots mean no external electronics are required to operate the drivers. Simply connect the power supply and laser diodes, and you’re ready to go. ACCURATELY PROTOTYPE YOUR LASER CONTROL SYSTEM The FL591FL features low-noise electronics and low quiescent current, and the feedback and monitor signals allow you to accurately characterize your laser controller. You can transfer the FL500 prototype configuration directly to your custom laser control system with no surprises. The FL500 is commonly used in hand-held, portable, and space constrained applications. The small size and light weight makes the FL500 ideal for airborne applications, and the dual-channel output is perfect for sighting-and- detection applications. FEATURES AND BENEFITS

  • Accurately and efficiently characterize the FL500 in your application environment
  • Includes FL500 Laser Driver chip already installed
  • Utilizes all the safety features of the FL500 » Adjustable current limits » Slow-start laser diode protection » Brownout protection
  • Onboard trimpots adjust output current and current limits
  • Drive two independent 250 mA channels or a single 500 mA output
  • Switches set the operating mode to Constant Current or Constant Power
  • Operates Type A and Type B Laser Diodes
  • Output Enable switch, LED status indicators
  • Power and Output cables included

CONTENTS

ELECTRICAL SPECIFICATIONS 6 SAFETY INFORMATION 7 OPERATING INSTRUCTIONS 8 TROUBLESHOOTING 11 TECHNICAL SUPPORT INFORMATION 12 MECHANICAL SPECIFICATIONS 17 CERTIFICATION AND WARRANTY 18 e Pb RoHS Compliant PAGE Applies to Product Revisions A through C © August 2020 A Laser Type B Laser Type 406-587-4910 www.teamWavelength.com FL591FL Laser Diode Driver DATASHEET AND OPERATING GUIDE

Table 1. Pin Descriptions and Wire Colors

1 LDA Red

current is output via connector LD1 only.

2 PDA White

current is output via connector LD1 only.

3 LDC Black

current is output via connector LD1 only.

1 DIS White

be set to ENABLE when this external enable function is used. TTL-compatible. Enable = Ground; Disable = OPEN or 3 to 5 V. 2 VS Red Power supply positive terminal. 3 GND Black Ground connection for power supply input. actual laser output current. Transfer function shown in Table 2. the photodiode current. Voltage range 0 to 2 V. Transfer function shown in Table 2. 3 LD1 Monitor Ground Low current return for LD1 monitors. Do not use for high current return. actual laser output current. Transfer function shown in Table 2. the photodiode current. Voltage range 0 to 2 V. Transfer function shown in Table 2. 6 LD2 Monitor Ground Low current return for LD2 monitors. Do not use for high current return.

Table 2. Monitor Transfer Functions FL591FL is operated in parallel-output mode. photodiode current on that channel.

  1. The photodiode feedback transfer function can be changed. See page 12 for details.

Table 3. Setpoint Transfer Functions The VSET1 and VSET2 voltages drive each channel independently. Parallel __ This configuration is not allowed.

  1. The photodiode feedback transfer function can be changed. See page 12 for details.

© 2020 www.teamWavelength.com 6 FL591FL LASER DIODE DRIVER ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SYMBOL DUAL- CHANNEL OPERATION SINGLE- CHANNEL OPERATION UNIT NOTE Supply Voltage VS 3 to 9 VDC Max LD Output Current ILD (2x) 250 (1x) 500 mA Laser Driver Internal Power Dissipation PMAX 1 W per channel 2 W total W TAMBIENT = 25ºC Case Operating Temperature TOPR -40 to 85 ºC Case Storage Temperature TSTG -55 to 125 ºC Weight 1.7 oz 47.6 g LASER DRIVER SPECIFICATIONS SYMBOL DUAL- CHANNEL SINGLE- CHANNEL UNIT NOTE CONSTANT CURRENT CONTROL Short Term Stability, 1 hour 35 to 40 ppm TAMBIENT = 25ºC Long Term Stability, 24 hours 50 to 75 ppm TAMBIENT = 25ºC CONSTANT POWER CONTROL Short Term Stability, 1 hour 0.009 % TAMBIENT = 25ºC Long Term Stability, 24 hours 0.02 % OUTPUT Peak Current IMAX 250 - 260 500 - 520 mA Compliance Voltage VS – (0.5 * VSET) V IMAX = 500 mA Rise Time 300 nsec ILD = 500 mA Fall Time 300 nsec ILD = 500 mA 3dB Bandwidth, Constant Current 500 kHz Sinewave input signal Delayed Start 100 msec Slow Start Ramp 15 mA / msec Depth of Modulation 99 % 100 kHz sinewave POWER SUPPLY Power Supply Voltage VS 3 to 9 V Quiescent Current, VS 100 mA at VS = 9 V V SET INPUT Input Impedance 51.1 Ω Input Voltage Range VSET1, VSET2 0 to 2 V Damage Threshold VSET < -0.3, VSET > (VS + 0.3) V NOISE Noise and Ripple (RMS) 3 µA ILD = 100 mA Leakage Current with output disabled 100 150 µA VSET = 0 V VSET = 1 V VSET = 2 V

© 2020 www.teamWavelength.com 7 FL591FL LASER DIODE DRIVER THEORY OF OPERATION The FL591FL employs Wavelength’s FL500 laser diode control chip, and can drive a single output up to 500 mA or dual outputs up to 250 mA each. When operating with two separate outputs, the FL591FL can be configured to use a single setpoint to drive both outputs to the same current, or use separate setpoint signals to drive each current source independently. 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 setpoint voltage is controlled by the onboard trimpot or by an external input. 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. 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 current sources can be operated in Constant Current (CC) mode or in Constant Power (CP) mode. In CP mode, the photodiode (PD) current is used in the feedback loop, and the driver adjusts the output current in order to keep the PD current constant. The laser driver includes features that help protect your laser and make the driver more versatile in a wide array of applications:

  • The current limit is set by an onboard trimpot and protects the laser from over-current conditions.
  • Slow-start delays the current ramp by 100 msec, and then ramps the current to setpoint at a rate of 15 mA / msec.
  • The photodiode feedback control loop allows for Constant Power operation whereby the driver adjusts the laser forward current in order to maintain a constant photodiode current. SAFETY INFORMATION SAFE OPERATING AREA — DO NOT EXCEED INTERNAL POWER DISSIPATION LIMITS Before attempting to operate the FL591FL, it is imperative that you first determine that the FL500 will operate within the Safe Operating Area (SOA). Operating the unit outside of the SOA may damage the controller or the laser. Operating outside of the SOA will void the warranty. Go to the Wavelength Electronics website for the most accurate, up-to-date, and easy to use SOA calculators: www.teamwavelength.com/support/design-tools/soa-ld-calculator/www.teamwavelength.com/support/design-tools/soa-ld-calculator/ SOA charts are included in this datasheet for quick reference (page 15), but we recommend you use the online tools instead. To ensure safe operation of the FL591FL driver, it is imperative that you determine if the FL500 is going to be operating within the internal heat dissipation Safe Operating Area (SOA).

and two are configured independently. Table 5. Setpoint Jumper Configuration only the onboard trimpot setpoint signals. transfer functions are listed in Table 2 on page 5.

  • The DIS pin on the power connector must be grounded.
  • The output ENABLE switch must be set to ENABLE. Channels one and two are enabled simultaneously, whether the FL591FL is in separate- or parallel-output mode. When the output is enabled, the LED next to the ENABLE switch will illuminate. The output is disabled by floating the DIS pin or applying a 3 – 5 VDC signal, or by setting the ENABLE switch to DISABLE. ADJUST THE OUTPUT CURRENT SETPOINT IN CONSTANT CURRENT MODE Calculate the VSET voltage value using the equation below. Use the proper CC-mode transfer function for dual- or single-channel operation (see Table 2). VSET = ILD / Transfer Function (V) Connect the positive lead of the DMM to the VSET1 testpoint, and the negative lead to the GND testpoint and adjust the VSET1 trimpot until the voltage value on the DMM matches the value calculated above. Turning the trimpot clockwise increases the output current. Repeat the process on the second channel if operating in dual-channel mode. ADJUST THE OUTPUT CURRENT SETPOINT IN CONSTANT POWER MODE In Constant Power mode, the drive current is not set directly. Rather, the photodiode current setpoint is calculated and set; the controller adjusts the output current in order to maintain the required photodiode current. Refer to the laser diode datasheet to find the photodiode current at the desired optical output power level. Then calculate the V SET voltage value using the equation below, and the CP-mode transfer function listed in Table 2. VSET = IPD / Transfer Function (V) Connect the positive lead of the DMM to the VSET1 testpoint, and the negative lead to the GND testpoint and adjust the VSET1 trimpot until the voltage on the DMM matches the VSET voltage. Turning the trimpot clockwise increases the Constant Power setpoint current. Repeat the process on the second channel if operating in dual-channel mode. RECONFIGURE FOR YOUR APPLICATION Once you are familiar with the operation of the FL591FL, switch off the output and power supplies, and remove the test load. Wire your laser diode according to the wire diagram shown in Figure 2 on page 2.

© 2020 www.teamWavelength.com 11 FL591FL LASER DIODE DRIVER TROUBLESHOOTING PROBLEM POTENTIAL CAUSES SOLUTIONS Driver will not switch on Improperly configured power supply Carefully check the wiring diagram on page 2. Make sure the power supply polarity is not reversed. Power supply voltage too low Check the electrical specifications on page 6 and make sure the power supply is within the required voltage range to operate the FL591FL. Output will not enable Improperly configured Enable switch on the FL591FL The DIS pin on the Power connector must be grounded AND the switch on the FL591FL must be set to ENABLE. Power supply voltage too low Check the electrical specifications on page 6 and make sure the power supply is within the required voltage range to operate the FL591FL. Driver not working properly in constant current, parallel- output mode Jumpers configured incorrectly Check page 9 to make sure the output jumper is set properly. Improper output wiring configuration Check that the connections to the laser diode are made via output connector LD1. Laser output power too low in Constant Current mode Laser current setpoint too low Increase the setpoint either by adjusting the trimpot, or by increasing the signal voltage on the input connector. Laser current limit too low Refer to page 9 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 FL591FL is not compliance limited. Refer to the Electrical Specifications table on page 6. Laser does not reach desired output in Constant Power mode Current limit too low Check the laser diode datasheet to determine the approximate laser drive current at the desired optical power output level. Then verify that the current limit is set slightly higher than that. Refer to page 9 for instructions on setting the laser driver current limit. Photodiode feedback current is out of range for the FL591FL Refer to page 12 for information on adjusting the photodiode current range.

in Figure 7. The default resistor value is 1 kΩ ±1%. Figure 7. Photodiode Feedback Resistors

  • Adjust the Photodiode Current Range
  • FL591FL Schematic
  • Safe Operating Area Calculation

© 2020 www.teamWavelength.com 13 FL591FL LASER DIODE DRIVER PDFB1 PDFB2 PSET1 PSET2 CC/CP1 CC/CP2 LM4040-2.5 4 3 Q4A Q4B MMDT3946 R84 249 3 1 W CW CCW R82 2.0K C46 10uF C47 10uF R81 182 VCC 8 4 U4A AD8032 8 4 U6A AD8032 VCC-U4 VCC-U6 VEE-U6 R78 1.05K BSS138 VCC R27 499 R28 499 VCC R61 10.0 VCC1 GND2 RST3 VSET14 GND5 VSET26 LDC2 7LDC2 8PGND 9PGND 10LDC1 11LDC1 12 FL500 PDA1 PDA2 VS LDA2LDA1 LDC3 PDA2 LDA1 LD Conn LDC3 PDA2 LDA1 LD Conn 3JP2 VS-U7 IMON1 IMON2 VEE-U7 R57 1.0 R48 1.0 8 4 U7A AD8032 7U7B AD8032 C17 10uF C16 10uF C26 10uF C48 10uF D10 LM4040-2.5 4 3 Q5A Q5B MMDT3946 R96 249 3 1 W CW CCW R92 2.0K C49 10uF C50 10uF R91 182 VCC 7U4B AD8032 7U6B AD8032 R90 1.05K C51 10uF 1N4148 1N4148 VSET2 VSET1 VS EN 1 GND 3 VS 2 Power SPDT Toggle C19 100uF C18 100uF 3JP1 LDC2 IMON1 IMON2 PMON2 PMON1 MONITORS TP7 Test Point SML-LXT0805GW TP6 (VIA) Test Point TP5 (VIA) Test Point R20 1.0 R21 1.0 R77 1.0K R76 1.0K R85 1.0K R75 1.0K R83 1.0K R89 1.0K R88 1.0K R87 1.0K R97 1.0K R93 1.0K R60 20.0k R56 20.0k R54 20.0k R45 20.0k R49 1.0K R58 1.0K R98 2.0K R86 2.0K R53 4.99K R44 4.99K R59 4.99K R55 4.99K TP2 LIM1 TP4 LIM2 LDA1 FL591FL SCHEMATIC, PAGE 1

© 2020 www.teamWavelength.com 14 FL591FL LASER DIODE DRIVER 3 1 W CW CCW R101 2.0K C53 10uF JP3 JP4 R80 51.1 R79 51.1 8 4 U8A AD8032 7U8B AD8032VEE-U8 VCC-U8 4 3 Q6A Q6B MMDT3946 R99 182 C52 10uF D12 LM4040-2.5 3 1 W CW CCW R110 2.0K C56 10uF JP5 JP6 R118 51.1 R112 51.1 8 4 U9A AD8032 7U9B AD8032VEE-U9 VCC-U9 4 3 Q7A Q7B MMDT3946 R108 182 C55 10uF D14 LM4040-2.5 VEE-U1 VEE-U3 PDA1 VS-U1 VCC-U3 PMON1 PSET1 PDR1 C1 0.012uF 0.022uF 8 4 U1A AD8032 8 4 U3A AD8032 PDFB1 PDA2 PMON2 PSET2 PDFB2 PDR2 C14 0.012uF C20 0.022uF 7U1B AD8032 5 7U3B AD8032 D11 1N4148 D13 1N4148 VSET1 VSET2 BNC BNC VEE VS VEERAW 1.0 R16 1.0 R12 10.0 R13 10.0 C12 10uF 0.47uF 0.47uF 4.7uF C10 10uF VS VEE Filter for U1 VS-U1 VEE-U1 VCC VEE Filter for U3 VCC-U3 VEE-U3 VCC VEE Filter for U6 VCC-U6 VEE-U6 VS VEE Filter for U7 VS-U7 VEE-U7 C21 0.1uF C28 0.1uF C22 0.1uF C29 0.1uF C23 0.1uF C30 0.1uF C24 0.1uF C31 0.1uF R63 10.0 R67 10.0 R64 10.0 R68 10.0 R65 10.0 R69 10.0 R66 10.0 R70 10.0 VCC VEE Filter for U8 VCC-U8 VEE-U8 C35 0.1uF C36 0.1uF R72 10.0 R73 10.0 VCC VEE Filter for U9 VCC-U9 VEE-U9 C37 0.1uF C38 0.1uF R94 10.0 R95 10.0 VRAW VCC Filter for U4 VCC-U4 C25 0.1uF R62 10.0 VCC C13 100uF VCC VCC C57 22uF C54 22uF 22uF 22uF R103 1.0K R105 1.0K R104 1.0K R114 1.0K R113 1.0K R115 1.0K R106 1.0K R107 1.0K R116 1.0K R117 1.0K 1.0K 1.0K 1.0K 1.0K R17 1.0K R18 1.0K R19 1.0K R24 1.0K R23 1.0K R25 1.0K 1.0K 1.0K 100k R14 100k R102 2.0K R111 2.0K R109 499 R100 499 TP3 VSET2 TP1 VSET1 TP11 VSET GND C11 22uF 22uF R10 1.0K R26 1.0K TP4 (VIA) Test Point FL591FL SCHEMATIC, PAGE 2

© 2020 www.teamWavelength.com 16 FL591FL LASER DIODE DRIVER CABLE SPECIFICATIONS POWER CABLE -- FL591-00101-A; INCLUDED WITH FL591FL Molex 43645-0300 Terminal Housing Molex 43030-007 3mm Micro-Fit Terminal 1 - DIS 2 - VS 3 - GND 18” Long, 22 AWG OUTPUT CABLE -- FL591-00102-A; TWO INCLUDED WITH FL591FL 1 - LDA 2 - PDA 3 - LDC Molex 43645-0300 Terminal Housing Molex 43030-007 3mm Micro-Fit Terminal 18” Long, 22 AWG

4 PLS

Figure 11. FL591FL Mechanical Dimensions

© 2020 www.teamWavelength.com 18 FL591FL 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: FL591-00400 REV. DATE CHANGE F Nov 2012 Update datasheet for FL591FL product enhancement G March 2014 Clarified reflow compatibility H June 2014 Updated Transfer Functions I February 2017 Updated max supply voltage value

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