ORDERING INFORMATION
PART NO
DESCRIPTION
WLD33ND
2.2 A Laser Diode Driver
WLD33ND-3A
3 A Laser Diode Driver
WLD33ND-HB 2.2 A Li+ Battery-compatible Driver
WLD33ND-2L
2.2 A Lower Noise Driver (CC only)
WLD33ND-3L
3 A Lower Noise Driver (CC only)
WLD33ND-EV
Evaluation PCB
WTW002
Thermal Washer for all WLDs
WHS302
Heatsink for all WLDs
WXC303
+5 VDC Fan for all WLDs
WXC304
+12 VDC Fan for all WLDs
SMALL FOOTPRINT
The WLD33ND is an easy-to-use analog circuit for space
constrained laser diode applications. The WLD33ND
maintains precision laser diode current (Constant Current
mode) or stable photodiode current (Constant Power mode)
regulation using electronics that are compatible with any
laser diode type. Safely supply up to 3 A of current (model-
dependent) to a laser diode from a 5 V power supply.
MODEL VARIATIONS
There are five laser diode driver models available in the
WLD family. The standard WLD33ND provides up to 2.2 A to
the laser diode. The WLD33ND-3A provides up to 3 A. The
WLD33ND-2L and WLD33ND-3L are lower noise versions
for Constant Current mode of the 2.2 and 3 A models,
respectively. The WLD33ND-HB is designed to operate with
lower voltage supplies, including lithium-ion batteries.
RAPID PROTOTYPING
Use the WLD33ND-EV Evaluation Board to rapidly
prototype a complete laser diode control system using the
of the WLD33ND laser diode driver. Onboard switches,
connectors, and trimpots make the configuration and
operation simple. Input and output cables are also included
with the WLD33ND-EV.
The WLD33ND is excellent for VCSELs, electro-optical
equipment, and medical/dental systems.
ACCESSORIES
In addition to the WLD33ND-EV Evaluation Board, there
are thermal management kits designed specifically for the
WLD. WEV300 includes a thermal washer and heatsink.
WEV301 adds a +5 V fan, while WEV302 adds a +12 V
fan to the kit. Additionally, there are various power supplies
available that fit any current/voltage needs.
FEATURES AND BENEFITS
• Low cost
• Slow-start laser diode protection
• Drive up to 3 A output current
• Constant Current or Constant Power operation
• Compatible with any laser diode type
• Small package size (1.3” × 1.26” × 0.3”)
• Voltage-controlled setpoint
• TTL-compatible shutdown pin
• Adjustable current limit
• Adjustable current range
• 2 MHz Constant Current bandwidth
• Over-temperature shutdown
• 14-pin DIP PCB mount
CONTENTS
OPERATING INSTRUCTIONS — GENERAL
OPERATING INSTRUCTIONS — STANDALONE
OPERATING INSTRUCTIONS — WITH EVALUATION BOARD
ADDITIONAL TECHNICAL INFORMATION
e
PAGE
Pb
RoHS
Compliant
© February 2022
A
Laser Type
B
Laser Type
C
Laser Type
406-587-4910
WLD33ND & WLD33ND-EV
Laser Diode Driver & Evaluation Board
DATASHEET AND OPERATING GUIDE
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