LDTC0520 / LDTC1020 Combination Laser DIode Driver and
T
emperature Contr
oller
www.teamwavelength.com
© 2007
LDTC1020-00400-A Rev B
TOP VIEW
(Actual Size)
GENERAL DESCRIPTION:
The LDTC0520 combines a 500 mA, low noise
laser driver and 2.2 Amp temperature controller
on one small board. The LDTC1020 parallels
two 500 mA laser drivers to provide up to 1 Amp
of laser current with the 2.2 Amp temperature
controller.
The WTC3243 will control temperature using
thermistors, 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 FL500
500 mA Laser Driver. It maintains precision laser
diode current (Constant Current mode) or stable
photodiode current (Constant Power mode)
using electronics compatible with Common
Photodiode Cathode (Type A/B) lasers.
Combine the low noise drive current of the FL500
with the temperature stability of the WTC3243
FEATURES:
• Small package size
• Single supply operation
• Cost Effective
• RoHS Compliant
FEATURES, Laser Diode Driver:
• Default current range is 500 mA or 1 Amp.
• Low Noise operation
• Slow start laser diode protection
• Constant Current or Constant Power modes
• Compatible with Common Photodiode
Cathode (A or B type) laser diodes
• Adjustable laser diode current limit
FEATURES, Temperature Controller:
• Drive up to 2.2A of TEC current
• Internal or External set point control
• Fail safe set point defaul
• Ultra-stable PI control loop
• Separate Heat & Cool current limits
• Single power supply operation
June, 2007
Figure 1
Top View Pin Layout
(Pin Descriptions on Page 7)
LDTC0520 / LDTC1020
VDD_FL
VDD_WTC
VS
GND
SP1
SP2
LD SHD
COM
EXT LD SET
COM
LD P M
LD I M
ACT T M
SET T M
EXT T SET
COM
LDC
PDA
PDC
LDA
COM
TEC+
TEC-
SEN+
SEN-
COM
J1
J2
J3
