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DATASHEET AND OPERATING GUIDE
LDTC0520/LDTC1020
Laser Diode & Temperature Controllers
PROVEN RELIABILITY
SAVES YOU TIME AND MONEY
The LDTC Laser Diode and Temperature Controller
combines the proprietary FL500 and ultra-stable WTC3243
in one compact and easy-to-use module. All the controls and
indicators are onboard for simple plug-and-play operation.
APPLICATIONS
LDTC modules are in use around the world providing
trouble-free reliability in range fi nders, telecom laser
modules, military-aerospace research and development,
airborne metrology, academic research, laser diode LIV
testers, and more.
CONTENTS
OPERATING INSTRUCTIONS -- TEMP CONTROLLER
OPERATING INSTRUCTIONS -- LASER DRIVER
TROUBLESHOOTING -- TEMP CONTROLLER
406-587-4910
www.teamWavelength.com
FEATURES AND BENEFITS
• Small package size
• Single supply operation possible
• LD current range 500 mA or 1 A
• Compatible with Type A and B lasers
• Slow start laser diode protection
• Constant Current or Constant Power modes
• Adjustable laser diode current limit
• Brownout protection
• Drive up to ±2.2 A of TEC current
• Internal or External setpoint control
• Failsafe setpoint default
• Ultra-stable PI control loop
• Separate Heat & Cool current limits
POWER YOUR APPLICATION WITH
THE RIGHT FEATURES
The popular FL500 is known for trouble-free operation.
The current limit circuit cleanly clamps laser diode current
without ringing or overshoot, and recovers without inducing
a phase shift in a modulated laser signal.
The WTC3243 ultra-stable temperature control module is
known for precision and reliability. Independent cooling-
and heating-current limits allow the LDTC to be used with
thermoelectric coolers or resistive heaters, and either
negative or positive temperature coeffi cient sensors.
ORDERING INFORMATION
PAGE
2
PART NO
5
LDTC0520
7
LDTC1020
9
10
15
17
22
23
25
26
Applies to Product Revisions A - C
© April 2015
DESCRIPTION
500 mA LD / ±2.2 A TEC Controller
1.0 A LD / ±2.2 A TEC Controller
e
Pb
RoHS
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Related Manuals for Wavelength Electronics LDTC0520
Summary of Contents for Wavelength Electronics LDTC0520
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Page 1: Table Of Contents
DATASHEET AND OPERATING GUIDE LDTC0520/LDTC1020 Laser Diode & Temperature Controllers FEATURES AND BENEFITS • Small package size • Single supply operation possible • LD current range 500 mA or 1 A • Compatible with Type A and B lasers • Slow start laser diode protection •... -
Page 2: Quick Connect Guide
FL500 chips on the circuit board: Figure 1. LDTCxx20 Top View the LDTC0520 has a single FL500 on the top; the LDTC1020 has two FL500 chips─one on each side of the circuit board. Figure 1 is the top view of the LDTC, illustrating the onboard switches and trimpots. - Page 3 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER The LDTCxx20 is compatible with Type A and Type B lasers, but will not drive Type C lasers; see Figure 3. Ty p e C L a s e r D i o d e...
- Page 4 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER RECOMMENDED THERMOELECTRIC TEST LOAD For the temperature controller, recommended simulated thermoelectric and thermistor circuits are shown in Figure 6 and Figure 7. Confi guring the temperature controller using test loads is recommended for setting the thermoelectric controller limits or to check the temperature controller operation.
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Page 5: Pin Descriptions
NAME PIN DESCRIPTION COLOR Connector J1, Cable WCB303 (included with LDTC0520 and LDTC1020) Laser driver and laser diode power supply input; 3 to 12 VDC. Current rated to at least Green 1.1-times the laser diode forward current plus the driver quiescent current. Low-noise DD_FL switching power supply recommended. - Page 6 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER PIN DESCRIPTIONS (CONTINUED) CABLE NAME PIN DESCRIPTION COLOR Connector J3, Cable WCB301 (included with LDTC0520 and LDTC1020) Black Laser diode cathode connection White Photodiode anode connection Blue Photodiode cathode connection Laser diode anode connection Low current return for monitors, inputs, and status pins.
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Page 7: Electrical Specifications
LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SYMBOL LDTC0520 LDTC1020 UNIT NOTE LD Supply Voltage 3 to 12 DD_FL TC Electronics Supply Voltage 4.5 to 12 DD_WTC TC Load Supply Voltage 4.5 to 30... - Page 8 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER ELECTRICAL SPECIFICATIONS (CONTINUED) TEMPERATURE CONTROLLER UNIT NOTE SPECIFICATIONS OUTPUT CURRENT Max Output Current ±2.0 ±2.2 Compliance Voltage, TEC - 0.7 - 0.5 Full Temp Range, I = 100 mA Compliance Voltage, TEC - 1.2...
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Page 9: Safety & Thermal Design Considerations
Wavelength’s proprietary FL500 and highly stable WTC3243 in one compact module. SAFE OPERATING AREA — DO NOT EXCEED The LDTC0520 employs a single FL500 laser diode control INTERNAL POWER DISSIPATION LIMITS chip; the LDTC1020 parallels two FL500 chips. The current... - Page 10 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER The controller measures the load temperature by driving a OPERATING INSTRUCTIONS -- current through the temperature sensor and measuring the TEMPERATURE CONTROLLER voltage drop across it. Similarly to the laser driver, you do not directly adjust the setpoint on the temperature controller;...
- Page 11 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER NECESSARY EQUIPMENT POWER SUPPLY REQUIREMENTS The following equipment is the minimum necessary to The power supplies can be confi gured in a number of confi gure the LDTC for basic operation. different ways in order to integrate the LDTC more smoothly •...
- Page 12 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER WIRE THE TEMPERATURE CONTROLLER SET THE TEMPERATURE CONTROLLER POWER SUPPLIES AND TEST LOADS CURRENT LIMITS Reference Figure 9 and wire the temperature controller These instructions are for a TEC application; if you are power supplies.
- Page 13 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER WIRE THE LDTC FOR YOUR TEMPERATURE CONTROL APPLICATION Remove the test loads, and reconfi gure the temperature controller with your temperature sensor and load. Refer to Table 4 to fi nd the proper wiring diagram for your confi...
- Page 14 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER Table 5 lists the suggested resistor values for R versus Table 6. Integrator Time Constant vs. Sensor Type and sensor type and the ability of the thermal load to change Thermal Load Speed temperature rapidly.
- Page 15 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER OPERATING INSTRUCTIONS -- LASER DRIVER Spare Wavelength recommends that initial wiring and confi guration of the LDTCxx20 is performed with test loads in place of 1N4001 the laser. Using test loads reduces the risk of damaging TEC+ (2x req’d)
- Page 16 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER WIRE THE LDTC FOR YOUR LASER DRIVER The laser output enable can be controlled from the onboard switch, or by an external signal. If the external switch is APPLICATION used, the onboard switch must be set to EN (enabled).
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Page 17: Additional Technical Information
LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER ADDITIONAL TECHNICAL WIRE THE LDTC TEMPERATURE CONTROLLER, ALTERNATE APPLICATIONS INFORMATION The LDTC can be wired in a number of different This section includes useful technical information on these confi gurations using different temperature sensors and load topics: transducers. - Page 18 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER SENSORS OTHER THAN A 10 K THERMISTOR The LDTCxx20 is factory-confi gured to bias a 10 kΩ Spare thermistor with 100 μA current, but with simple modifi cations See Note AD590 other sensors can be used. The instructions for making the...
- Page 19 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER USE THE AD590 To use an AD590 sensor refer to Table 7 for wiring instructions specifi c to your application. Refer to the sensor datasheet for supply voltage requirements and temperature RBias transfer function.
- Page 20 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER Equation 3. Calculate R AN ALTERNATE METHOD FOR SETTING THE LASER DRIVER CURRENT LIMIT The laser drive current can be set while using the test load, as recommended on page 15, or it can be set while PDMAX monitoring an internal test point.
- Page 21 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER SAFELY TIE THE POWER SUPPLY INPUTS If the laser diode is case-grounded with the laser anode tied to the case, then special attention must be paid to the power supply wiring. Figure 30 is a block diagram of the LDTC laser controller;...
- Page 22 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER SAFE OPERATING AREA CALCULATION 0.50 To determine if the LDTC controller is suitable for your 0.45 application and if it will be operating in the safe range, 0.40 consult the instructions for calculating the Safe Operating 0.35...
- Page 23 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER TROUBLESHOOTING -- TEMPERATURE CONTROLLER PROBLEM POTENTIAL CAUSES SOLUTIONS Temperature is decreasing The TEC may be connected The convention is that the red wire on the TEC module connects to when it should be increasing backwards to the LDTC TEC+ (pin 6) and the black wire to TEC- (pin 5).
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Page 24: Troubleshooting -- Laser Driver
LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER TROUBLESHOOTING -- LASER DRIVER PROBLEM POTENTIAL CAUSES SOLUTIONS Driver will not switch on Improperly confi gured power Carefully check the wiring diagram on page 2. Make sure the power supply supply polarity is not reversed. - Page 25 LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER CABLING SPECIFICATIONS POWER CABLE -- WCB303; INCLUDED WITH LDTCXX20 Molex KK 7880 Series Connector Housing: Molex 10-11-2043 Pin: Molex 46999-0101 36” Long, 22 AWG OUTPUT CABLE TO TEC & LD -- WCB301; INCLUDED WITH LDTCXX20...
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Page 26: Mechanical Specifications
LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER MECHANICAL SPECIFICATIONS DIMENSIONS - LDTC0520 / LDTC1020 2.10 [53.3] 2.60 2.90 [66.0] [73.7] 0.15 [3.8] 0.13 [3.3] 0.125 [3.18] 2.35 THROUGH, 2 PLS [59.7] 1.08 [27.4] 0.125 [3.18] Figure 36. LDTC0520 / LDTC1020 Dimensions All Tolerances ±5%;... -
Page 27: Certification And Warranty
SAFETY There are no user-serviceable parts inside this product. Return the CERTIFICATION product to Wavelength Electronics for service and repair to ensure that safety features are maintained. Wavelength Electronics, Inc. (Wavelength) certifi es that this product met its published specifi cations at the time of shipment.
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