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21

LDTC2/2 LASER DIODE DRIVER AND TEMPERATURE CONTROLLER

CABLING SPECIFICATIONS

POWER CABLE 

 WCB300 (INCLUDED WITH LDTC2/2) 

 CONNECTS TO J1

WCB-300

LDTC2/2 SERIES

POWER CABLE

RED

WHT
BLK

#1
#3

MOLEX PART #10-11-2033

TERMINAL HOUSING

MOLEX #08-50-0005

0.100" CRIMP TERMINAL

PIN

1
2

3

NAME
VDD
VS

GND

4 CONDUCTOR 22AWG FOIL SHIELD CABLE

36.0" LENGTH

WIRE COLOR
RED
WHITE

BLACK

DESCRIPTION
SUPPLY VOLTAGE -- LASER
SUPPLY VOLTAGE -- TEC

GROUND

OUTPUT CABLE TO TEC & LD 

 WCB301 (INCLUDED WITH LDTC2/2) 

 CONNECTS TO J3

10 CONDUCTOR 22AWG FOIL SHIELD CABLE

36.0" LENGTH

MOLEX #08-50-0005

0.100" CRIMP TERMINAL

MOLEX PART #10-11-2103

TERMINAL HOUSING

BLK
WHT
BLU
RED
GRN
RED/BLK
ORG
WHT/BLK
ORG/BLK
GRN/BLK

PIN

1
2
3
4
5
6
7
8
9

10

NAME
LDC
PDA
PDC
LDA
COM
TEC+
TEC-
SEN+
SEN-
COM

WIRE COLOR
BLACK
WHITE
BLUE
RED
GREEN
RED / BLACK
ORANGE
WHITE / BLACK
ORANGE / BLACK
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 CONNECTION
LOW CURRENT GROUND

I/O CABLE 

 WCB309 (INCLUDED WITH LDTC2/2) 

 CONNECTS TO J2

12 CONDUCTOR  22AWG CABLE

36.0" LENGTH

MOLEX # 08-50-0005

0.100" CRIMP TERMINAL

MOLEX PART # 10-11-2123

TERMINAL HOUSING

TAN

PINK

GREY

VIOLET

YELLOW

ORANGE

BLUE

BROWN

GREEN

RED

WHITE

BLACK

PIN

12
11
10

9
8
7
6
5
4
3
2
1

WIRE COLOR
BLACK
WHITE
RED
GREEN
BROWN
BLUE
ORANGE
YELLOW
VIOLET
GREY
PINK
TAN

NAME
COM
R TCSET
SET T M
ACT T M
LD I M
LD P M
COM
R LDSET
COM
LD SHD
PD MON
COM

DESCRIPTION
LOW CURRENT GROUND
REMOTE TEMPERATURE SETPOINT
SETPOINT TEMPERATURE MONITOR
ACTUAL TEMPERATURE MONITOR
LASER DIODE CURRENT MONITOR
PHOTODIODE MONITOR
LOW CURRENT GROUND
REMOTE LASER DIODE SETPOINT
LOW CURRENT GROUND
LASER DIODE SHUTDOWN
PHOTODIODE MONITOR IN CC MODE
LOW CURRENT GROUND

NOTE: LDTC2/2E & LDTC2/2O Rev. A 

DO NOT HAVE PINS

 1 & 2 of WCB309.

These were labeled as spares for Rev. A.

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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