LDTC2/2 Laser DIode Driver and
T
emperature Contr
oller
© 2005
PRELIMINARY
LDTC2/2-00400-A Rev A
TOP VIEW
GENERAL DESCRIPTION:
The LDTC 2/2 combines a 2.2 Amp laser driver
and 2.2 Amp temperature controller on one
small board. Available as an open frame or in a
chassis mount enclosure.
The WTC3243 will control temperature using
thermistors, 100
Ω
Platinum RTDs, or linear
temperature sensors such as the LM335 or
the AD590. Adjust temperature using the
onboard trim pot or a remote voltage input from
a panel mount potentiometer, DAC, or other
voltage source. A default temperature set point
confi guration provides fault tolerance and avoids
accidental damage to system components.
Adjustable trim pots confi gure heat and cool
current limits.
The heart of the laser driver section is the
WLD3343 2.0 Amp Laser Driver. It maintains
precision laser diode current (Constant Current
mode) or stable photodiode current (Constant
Power mode) using electronics compatible with
A/B Type lasers.
Ideal for higher power laser diodes for medical
diagnostic equipment, remote sensing, and
analytical instrumentation.
Combine the drive power of the WLD3343 with
the temperature stability of the WTC3243
FEATURES:
• Small package size
• Single supply operation
• Cost Effective
FEATURES, Laser Diode Driver:
• Default current range is 2.2A. Custom ranges,
from 3mA up, easily confi gured.
• Slow start laser diode protection
• Constant Current or Constant Power modes
• Compatible with A or B type laser diodes
• Adjustable laser diode current limit
• Remote TTL Shutdown / Interlock
FEATURES, Temperature Controller:
• Drive up to 2.2A of TEC current
• Set temp using D/A - includes default to near
room temperature to avoid drive when D/A is
turned off or signal lost
• Ultra-stable PI control loop
• Separate Heat & Cool current limits
• Single power supply operation
August, 2005
Figure 1
Top View Pin Layout
and Descriptions
LDTC2/2
1
1
1
CC
CP
+
S2
ON
OFF
Tset
LIMA
LIMB
ILIM
ISET
+
+
D1
D2
J1
J2
J3
J4
ExtTset
Vset
PDset
R2
R3
R4
R5
R6
COM
SEN-
SEN+
TEC-
TEC+
COM
LDA
PDC
PDA
LDC
GND
VS
VDD
COM
R TC SET
SET T M
ACT T MON
LD I MON
LD P MON
COM
R LDSET
COM
LD SHD
SP2
SP1
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
R SENSE
LD
ENABLE
POWER
ON
LD ENABLE
TOGGLE
SWITCH
Fan Power
