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LDTC2/2 LASER DIODE DRIVER AND TEMPERATURE CONTROLLER

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: LDTC2-2-00400

REV.

DATE

CHANGE

I

May 2013

Added the I

PD

 formula for Constant 

Current mode.

J

August 2014

Extended warranty, updated cable 

drawings and specification table.

K

February 2016 Updated WCB301 cable diagram.

L

January 2019

Updated  to  new  format.  Clarified 

limit-setting procedure.

51 Evergreen Drive

Bozeman, Montana 59715

406-587-4910  (tel)

406-587-4911  (fax)

Sales & Tech Support

[email protected]

[email protected]

Summary of Contents for LDTC2/2E

Page 1: ...o system components Adjustable trimpots configure heat and cool current limits The WLD3343 Laser Driver maintains precision laser diode curent Constant Current Mode or stable photodiode current Consta...

Page 2: ...A Laser Diode Type B Laser Diode Type C Laser Diode Common Cathode Laser Diode Anode Photodiode Cathode Common Isolated Photodiode Short the Laser Diode Anode to Photodiode Cathode Common Anode Laser...

Page 3: ...t set T SET to 0 85 V NOTE To stay within the Safe Operating Area while using the test load VS must not exceed 5 V RECOMMENDED LASER DRIVER TEST LOAD For the laser diode driver recommended simulated l...

Page 4: ...ge proportional to the current flowing through the laser diode See Table 2 for the transfer function 9 ACT T MON Actual Temperature Monitor Green Monitor the actual voltage produced by the temperature...

Page 5: ...s voltage output of Photodiode Monitor Pin 2 Connector J2 to forward current through Photodiode 2 RPD 499 for 2 0 mA range RPD 4 99 k for 200 A range NOTE Available on Rev B and later Actual Temperatu...

Page 6: ...BIENT 25 C Long Term Stability 24 hours 0 05 TAMBIENT 25 C OUTPUT Peak Current IMAX 1 8 2 0 2 2 A With heat sink and fan Compliance Voltage Laser Diode Load 3 0 V Full Temp Range ILD 2 0A 5V Rise Time...

Page 7: ...Sensor Compatibility Thermistor RTD IC Sensors Sensor Input Voltage Range 4 GND to VDD 2 0 V Sensor Input Damage Threshold 0 7 VDD 7 V VSET Input Impedance 500 k VSET Damage Threshold 0 7 VDD 7 V BIA...

Page 8: ...Constant Power operation is available where the driver adjusts the laser forward current in order to maintain a constant photodiode current Available remote LD TC setpoint control Separate heating an...

Page 9: ...CW WIRE OUTPUT CONNECTION Use Table 4 to determine the connection from the LDTC2 2 to your thermoelectric or resistive heater Table 4 Wiring vs Sensor Load Type SENSOR LOAD TEC PIN J3 6 TEC PIN J3 7...

Page 10: ...e Operating Calculators available on our website TEMPERATURE SETPOINT Wavelength introduces a special setpoint circuit with the LDTC2 2 An onboard trimpot TSET will adjust the voltage from 0 3 to 2 5...

Page 11: ...only when power is not applied to VDD Setting for 2 0 mA range Setting for 200 A range CC CP CC CP ExtTset Vset PDset Vset PDset ExtTset Figure 8 Select the photodiode range with the PDset jumper The...

Page 12: ...use proper operator grounding and anti static procedures MONITOR LASER DIODE OR PHOTODIODE CURRENT Equation 1 provides a transfer function for converting the voltage output of LD I M Laser Diode Curre...

Page 13: ...ow in Figure 10 and do not connect an external voltage source to the R LD SET input The ISET trimpot provides a setpoint adjustment of between zero to 2 5 V Use On board trimpot OR Sum ExtTset with tr...

Page 14: ...onto the corner posts and press PCB into seated position Install the eight screws in the WLD and WTC 4 Install the cover and cables PROPORTIONAL GAIN INTEGRATOR TIME CONSTANT PI TERMS The LDTC2 2 is...

Page 15: ...r RSENSE vs Maximum Laser Diode Current ILDMAX MAXIMUM OUTPUT CURRENT ILDMAX CONSTANT POWER RSENSE CONSTANT CURRENT RSENSE 50 mA 25 00 20 00 125 mA 10 00 8 00 250 mA 5 00 4 00 500 mA 2 50 2 00 1 25 Am...

Page 16: ...CC LDC PDA PDC LDA VDD VDD Ext Vset LIM S2 EG2211 R17 1 00K 1 R7 1 00K R19 1 00K R18 150 R16 10K 2 3 1 4 11 U6A 5 6 7 4 11 U6B 9 10 8 4 11 U6C 13 12 14 4 11 U6D R11 1 00K R10 1 00K R12 1 00K R9 1 00K...

Page 17: ...T T SET T GND ACT T SET T Common Common TEC TEC Sensor R33 10 0K R32 100K 1 2 3 J1 CON3 VDD PMON IMON Ext Vset Remote Enable PMON IMON Ext Vset Rem En Common PD MON Common NO 6 COM 5 NC 4 IN 1 V 2 GND...

Page 18: ...nd current IMAX specifications Calculate the voltage drop across the controller VDROP VDD VMAX Mark VDROP on the X axis and extend a line upward Mark IMAX on the Y axis and extend a line to the right...

Page 19: ...sure the temperature sensor is in good thermal contact with the load Operating outside of the ideal region of the temperature sensor The sensor type and bias current should be selected to maximize se...

Page 20: ...ge 12 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 LDTC2 2...

Page 21: ...ACK GREEN BLACK DESCRIPTION LASER DIODE CATHODE PHOTODIODE ANODE PHOTODIODE CATHODE LASER DIODE ANODE LOW CURRENT GROUND TEC CONNECTION TEC CONNECTION SENSOR POSITIVE CONNECTION SENSOR NEGATIVE CONNEC...

Page 22: ...NSIONS LDTC2 2E WITH ENCLOSURE 2 70 68 6 mm 0 15 3 8 mm 2 40 61 0 mm 4 80 121 9 mm 4 20 106 7 mm 0 15 3 8 mm 4 50 114 3 mm 0 13 3 2 mm 4 PLACES 0 30 7 6 mm 1 14 29 0 mm 500 1 27 875 2 22 125 0 32 3 70...

Page 23: ...5 3 8 mm 2 20 55 9 mm 0 15 3 8 mm 3 70 94 0 mm 0 062 1 6 mm 0 50 12 6 mm 0 50 12 7 mm 4 00 101 6 mm 2 50 63 5 mm 4 20 106 7 mm 0 250 6 3 mm 0 156 4 0 mm 0 750 2 000 3 700 4 000 0 150 2 200 2 500 0 150...

Page 24: ...LLER MECHANICAL SPECIFICATIONS DIMENSIONS HEATSINK FOOTPRINT 0 78 19 8 mm 0 945 24 0 mm 0 68 17 2 mm 0 945 24 0 mm 2 40 60 9 mm 0 945 24 0 mm 1 25 31 7 mm 0 156 4 0 mm 4 40 tapped holes in device 0 15...

Page 25: ...E 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...

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