Wavelength Electronics LDTC0520 Manual

LDTC0520 / LDTC1020
Combine the low noise drive current of the FL500
with the temperature stability of the WTC3243
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.
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.
Figure 1
Top View Pin Layout
(Pin Descriptions on Page 7)
VDD_FL
VDD_WTC
LD SHD
EXT LD SET
ACT T M
SET T M
EXT T SET
© 2007
Adjust
TOP VIEW
(Actual Size)
J1
VS
GND
J2
SP1
SP2
COM
COM
LD P M
LD I M
COM
LDTC1020-00400-A Rev B
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
LDC
PDA
PDC
LDA
COM
TEC+
TEC-
SEN+
SEN-
COM
J3
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