© 2018
2
LDTC2/2 LASER DIODE DRIVER AND TEMPERATURE CONTROLLER
Tset
LIMA
LIMB
ILIM
ISET
J1
J2
J3
COMmon
SENsor-
TEC-
TEC+
COMmon
LDAnode
PDCathode
PDAnode
LDCathode
GND
VS (5-28 V)
VDD (5-12 V)
COMmon
R TC SETpoint
SET T MONitor
ACT T MONitor
LD I MONitor
LD P MONitor
COMmon
R LDSETpoint
COMmon
LD SHD
PD MONitor
COMmon
3
2
1
10
9
8
7
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
LD ENABLE
TOGGLE
SWITCH
EXTERNAL
VOLTMETER
OR
VS
Bandgap
Voltage
Reference
D/A
0 V = OPEN = ENABLE
>3 V = CLOSED = DISABLE
{
AD590
THERMISTOR,
RTD, or ICs
OR
10 kΩ
OR
V
EXTERNAL
VOLTMETER
{
Like R TC SET (Pin 11)
VS
VDD
LD
ENABLE
V
DD
and V
S
can be tied together if common voltage provides
sufficient compliance for laser diode and thermoelectric loads.
Separate V
S
if higher compliance is required.
+
+
+
+
+
CC
CP
ExtTset Vset PDset
POWER
ON
CONSTANT CURRENT or
CONSTANT POWER Mode
Figure 1. Wiring Diagram for LDTC2/2.
Type 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 Diode Cathode &
Photodiode Anode Common
Figure 2. The LDTC2/2 is compatible with Type A and Type B lasers, but will not drive Type C lasers.
For initial setup and configuration, we recommend using a simulated load while configuring the laser diode driver, until
familiar with the controller operation. To pre-test or troubleshoot the temperature controller, please use the following
recommended test loads.
QUICK CONNECT GUIDE
!
It is imperative that you verify the unit will
operate within the internal heat dissipation
Safe Operating Area (SOA).
Operating the controller outside the SOA
may damage or destroy the LDTC and/or
loads.
Visit the Wavelength Electronics website for the most
accurate, up-to-date, and easy to use SOA calculator:
Laser Diode Drivers:
www.teamwavelength.com/support/design-tools/soa-ld-calculator/
Temperature Controllers:
www.teamwavelength.com/support/design-tools/soa-tc-calculator/
