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Wavelength Electronics LDTC2/2 Manual

Laser diode driver and temperature controller
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Combine the drive power of the WLD3343 with
the temperature stability of the WTC3243
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, 100Ω Platinum RTDs, or linear
temperature sensors such as the LM335 or
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.
Top View Pin Layout
and Descriptions
J3
SEN+
TEC+
COM
VS
VDD
J1
© 2005
PRELIMINARY
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
TOP VIEW
ExtTset
10
9
8
7
6
5
4
3
2
1
3
2
1
J4
Fan Power
Tset
LIMA
LIMB
LDTC2/2-00400-A Rev A
PDset
Vset
S2
12
11
10
9
R
8
SENSE
7
6
5
4
3
2
1
ISET
ILIM
LD ENABLE
LD
TOGGLE
ENABLE
SWITCH
www.teamwavelength.com
August, 2005
COM
R TC SET
SET T M
ACT T MON
LD I MON
LD P MON
COM
R LDSET
COM
LD SHD
SP2
SP1
J2

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Summary of Contents for Wavelength Electronics LDTC2/2

  • Page 1: Table Of Contents

    R TC SET TEC+ SET T M ACT T MON LD I MON SENSE LD P MON R LDSET LD SHD Fan Power Tset LIMA LIMB ISET ILIM LD ENABLE TOGGLE ENABLE SWITCH © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...
  • Page 2 PAGE 2 BLOCK DIAGRAM Schematic for WLD3343 connections © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...
  • Page 3 PAGE 3 BLOCK DIAGRAM Schematic for WTC3243 connections © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...

  • Page 4: Ldtc2/2

    Note [1]. With Revision D of the WLD3343, an internal thermostat has been added to activate Shutdown (SHD) when the internal temperature exceeds 105˚C. The output will be re-enabled after a 250 to 300 msec slow-start once the internal temperature drops below 95˚C. © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...
  • Page 5 NOTE: Operation higher than 5V on VDD (i.e. 12V) requires close evaluation of the SOA curves and current limit settings. Damage to the WLD or WTC will occur if they are operated outside their Safe Operating Area. Contact the factory if you plan to use higher than 5V. © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...

  • Page 6: The Ad590

    AD590 sensor connects to Pin 8 and the positive terminal to Pin 1 (VDD) of Connector 1. AD590 operation requires that VDD be +8 Volts or greater for proper operation. Common Low current GND for monitors, DACs, External VSET, etc. © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...
  • Page 7 (1) or the heatsink alone (2), but is outside of the Unsafe Operating Area for use with heatsink and Fan (3). An online tool for calculating your load line is at http://www.teamwavelength.com/tools/calculator/soa/defaultld.htm Graphs assume: 25°C Case © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...
  • Page 8 Proper Heat dissipation from the WLD & WTC is critical to longevity of the LDTC 2/2. The heat spreaders of the WTC3243 and WLD3343 are positioned to use your chassis for heat dissipation. Be sure to add thermally conductive paste to all relevant surfaces that need to dissipate heat. © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...
  • Page 9 V . LIM B trimpot setting is then irrelevant. 3. CONNECT TEMPERATURE SENSOR The LDTC2/2 is confi gured to operate a 10kΩ thermistor with a 100µA bias current. If your application requires a different sensor, please contact Wavelength for details.

  • Page 10: Figure 1

    LDTC2/2. An on-board trimpot (TSET) PI TERMS will adjust the voltage from 0.3V to 2.5V. The LDTC2/2 is confi gured to the mid-range Additionally, Pin 11 (R TC SET) & 12 (COM) of positions appropriate for most laser diode loads.
  • Page 11 Recommended order of setup: CAUTION: WTC temperature control section WITHOUT Operate the LDTC2/2 with loads attached - the laser diode installed THEN the WLD laser if you short either the LD or TC output diode driver. Use a simulated laser diode connections during setup, current will fl...
  • Page 12 Constant Power Operation that can provide the appropriate level of noise and ripple for the application at hand should be Select between two ranges on the LDTC2/2 utilized. board: 200µA or 2.0mA. A jumper (JP3) selects the range. Move this jumper only when power is Wavelength Electronics offers a selection of not applied to VDD.
  • Page 13 4.99kΩ for 200µA range default I / 499 for 2.0mA range LD P M default I / 4990 for 200µA range LD P M Photodiode current can be monitored in Constant Current mode. © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...
  • Page 14 8. CONFIGURE THE LASER DIODE CURRENT LIMIT To use an external voltage source summed The default confi guration of the LDTC2/2 uses a with the voltage supplied by the SET trim pot, trimpot to adjust the Current Limit from 0 to the place the VSET SOURCE jumper in the lower maximum range set in Step 1- WLD Operation.
  • Page 15 For easy heasinking of Open Frame Model: WEV-300 Standard WLD or WTC thermal washer and heatsink WEV-301 Standard WLD or WTC thermal washer, heatsink, and 5V fan WEV-302 Standard WLD or WTC thermal washer, heatsink, and 12V fan © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...
  • Page 16 PAGE 16 MECHANICAL SPECIFICATIONS - LDTC2/2 E - with enclosure Ø0.13" [Ø3.2 mm] 4 PLACES 4.80" [121.9 mm] 4.50" [114.3 mm] 4.20" [106.7 mm] 0.30" [7.6 mm] 0.15" [3.8 mm] 2.40" [61.0 mm] 0.15" [3.8 mm] 2.70" [68.6 mm] 1.14" [29.0 mm] ©...
  • Page 17 PAGE 17 MECHANICAL SPECIFICATIONS - LDTC2/2 O - Open Frame 2.50" [63.5 mm] 4.20" [106.7 mm] Ø0.250" [Ø6.3 mm] 4.00" 3.70" [101.6 mm] [94.0 mm] 0.15" [3.8 mm] Ø0.156" [Ø4.0 mm] 2.20" [55.9 mm] 0.15" [3.8 mm] 0.50" [12.7 mm] 0.062"...
  • Page 18 0.945" [24.0 mm] tapped holes in device 3.70" [94.0 mm] 2.40" [60.9 mm] 0.946" [24.0 mm] 0.68" [17.2 mm] 0.15" [3.8 mm] 0.78" 0.945" [24.0 mm] [19.8 mm] 2.20" [55.9 mm] 0.15" [3.8 mm] © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...

  • Page 19: Power On

    ORG W/ BLK 8 - LD I M BLUE 9 - ACT T M RED W/ BLK 10 - SET T M WHT W/ BLK 11 - R TCSET ORANGE 12 - COM BLACK © 2005 PRELIMINARY LDTC2/2-00400-A Rev A www.teamwavelength.com...
  • Page 20 PAGE 20 CERTIFICATION AND WARRANTY CERTIFICATION: Wavelength Electronics (WEI) certifi es that this NOTICE: product met it’s published specifi cations at the The information contained in this document is time of shipment. Wavelength further certifi es subject to change without notice. Wavelength...

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