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Wavelength Electronics WLD3343 Manual

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WLD3343
General Purpose Driver for
Laser Diodes & VCSELs
GENERAL DESCRIPTION:
The WLD3343 is an easy-to-use analog circuit
for space constrained laser diode applications.
The WLD3343 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 Amps of current to your laser diode from a
single +5 Volt power supply.
Excellent
for
VCSELs,
equipment, and medical/dental systems.
Up to 500 mA
Figure 1
Top View Pin Layout
and Descriptions
Shutdown Laser Diode Output Current
Setpoint Voltage Input
Laser Diode Current Monitor
Photodiode Current Monitor
Mode Configuration
Laser Diode Current Limit
Power Supply Ground
© 2001-2013
electro-optical
Add Fan for 2 A
Add Heatsink &
Thermal Washer for 1 A
TOP VIEW
SHD
1
VSET
2
IMON
3
PMON
OUTA
4
MODE
5
LIM
OUTB
6
GND
7
WLD3343-00400-O
FEATURES:
• Low Cost
• Slow Start Laser Diode Protection
• Drive Up to 3 Amps Output Current
• Constant Current or Power Operation
• Compatible With Any Laser Diode Type
• Small Package Size (1.30" X 1.26" X 0.313")
• 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
Ordering Information
WLD3343
2.2 A Laser Diode Driver
WLD3343HB
2.2 A Li+ Battery-compatible Driver
WLD3343-3A
3 A Laser Diode Driver
WLD3343-2L
2.2 A Lower Noise Driver, no CP mode
WLD3343-3L
3 A Lower Noise Driver, no CP mode
Evaluation PCB for WLD3343,
WLD3393
WLD3343-3A, WLD3343-2L,
and WLD3343-3L
Thermal Washer for all WLDs
WTW002
WHS302
Heatsink for all WLDs
WXC303
+5 VDC Fan for all WLDs
WXC30
4
+12 VDC Fan for all WLDs
VDD
Power Supply Input
14
PD-
Photodiode Current Sense Resistor Negative Input
13
PD+
Photodiode Current Sense Resistor Positive Input
12
Output A
11
RS-
Laser Diode Current Sense Resistor Negative Input
10
Output B
9
RS+
Laser Diode Current Sense Resistor Positive Input
8
January, 2013
(BOTTOM VIEW)
e
Pb
RoHS
www.teamWavelength.com

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Summary of Contents for Wavelength Electronics WLD3343

  • Page 1 RoHS FEATURES: GENERAL DESCRIPTION: • Low Cost The WLD3343 is an easy-to-use analog circuit for space constrained laser diode applications. • Slow Start Laser Diode Protection The WLD3343 maintains precision laser diode • Drive Up to 3 Amps Output Current current (constant current mode) or stable •...

  • Page 2: Top View

    Operated in Constant Current Mode http://www.teamwavelength.com/support/tools.asp. Constant Current: See Eq. 5 Bandgap ENABLE Voltage Reference DISABLE Part # LM4040 www.national.com WLD3343 See Eq. 7 IMON LASER DIODE DRIVER Adjusting Laser Adjusting Diode Current Range Limit Current See Table 1 or Eq. 1...

  • Page 3: Electrical And Operating Specifications

    2 W (without heatsink), 3 W (with heatsink), and 10 W (with heatsink and fan). [2] With Revision D forward 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.

  • Page 4: Power Supply

    PAGE 4 ELECTRICAL AND OPERATING SPECIFICATIONS - Continued PARAMETER TEST CONDITIONS UNITS WLD3343-2A WLD3343-3A INPUT Offset Voltage, initial, I Pin 2, T = 25˚C, V = 0 V AMBIENT -50 to 150 μA Bias Current 0 to 2 Input Voltage Range...

  • Page 5: Pin Descriptions

    Mode Confi guration CONSTANT CURRENT OPERATION: A 1k resistor between Pin 5 (MODE) and Pin 6 (LIM) confi gures the WLD3343 to regulate the laser diode’s forward current. CONSTANT POWER OPERATION: A 0.1 μF capacitor between Pin 5 (MODE) and Pin 6 (LIM) confi...
  • Page 6 CC: Connect Pin 12 (PD+) and Pin 13 (PD-) to Pin 7 (GND). CP: Connect Pin 13 (PD-) to the cathode of the photodiode. Power Supply Input Power supply input for the WLD3343’s internal control electronics. Supply range input for this pin is +5 to +12 Volts DC. LASER DIODE PACKAGE...
  • Page 7 Refer to the chart shown below and note that the Load Line is in the Unsafe Operating Areas for use with no heatsink (1) or the heatsink alone (2), but is outside of the Unsafe Operating Area for use with heatsink and Fan (3). Graphs assume: 25°C Ambient 75°C Case © 2001-2013 WLD3343-00400-O www.teamWavelength.com...
  • Page 8 Refer to the chart shown below. Note that the Load Line is in the Safe Operating Area for use with heatsink and fan (3). It is in the Unsafe Operating Area for use with no heatsink (1) or the heatsink alone (2). Graphs assume: 25°C Ambient 75°C Case © 2001-2013 WLD3343-00400-O www.teamWavelength.com...

  • Page 9: Operation

    • Select a resistor with a low temperature coeffi cient (1% ≈ 100ppm/˚C). Constant Current Mode • Place R as close to Pins 8 (RS+) and SENSE 10 (RS-) on the WLD3343 as possible to 1.00 avoid parasitic resistance effects from the SENSE PCB layout. LDMAX •...
  • Page 10 3. CONFIGURING THE LASER DIODE CURRENT LIMIT The WLD3343 allows a customized current range for Example 1 a specifi c application. This allows optimized set point Choosing R for a Type A/B Laser Diode resolution while minimizing output noise.
  • Page 11 0.32 (32%) 0.36 (36%) 0.40 (40%) 0.44 (44%) 0.48 (48%) 0.52 (52%) 0.56 (56%) 0.60 (60%) 0.64 (64%) 0.68 (68%) 0.72 (72%) 0.76 (76%) 0.80 (80%) 0.84 (84%) 0.88 (88%) 0.92 (92%) 0.96 (96%) 1.00 (100%) © 2001-2013 WLD3343-00400-O www.teamWavelength.com...
  • Page 12 • Select a resistor with a low temperature coeffi cient (ppm/˚C). • Place R as close to Pins 12 (PD+) and 13 (PD-) on the WLD3343 as possible to avoid parasitic resistance effects from the PCB layout when in constant power mode. © 2001-2013 WLD3343-00400-O www.teamWavelength.com...
  • Page 13 Figure 6 using a SPST (Single-Pole Single-Throw) switch or a TTL signal. NOTE: Do not insert or remove the laser diode from the ENABLE SHUTDOWN WLD3343 circuit with power applied to the unit. SWITCH DISABLE WLD3343 TTL INPUT DISABLE...
  • Page 14 Figure 7 A/B Laser Diode Constant Current Operation Constant Current: See Eq. 5 Bandgap ENABLE Voltage Reference DISABLE Part # LM4040 www.national.com WLD3343 See Eq. 7 IMON LASER DIODE DRIVER Adjusting Laser Adjusting Diode Current Range Limit Current See Table 1 or Eq. 1...
  • Page 15 Part #LM4040 www.national.com LD Range SENSE SENSE (Rev. C) (Rev. A&B) 2.0 A 438 m 500 m 200 mA 5.01 WLD3343 See Eq. 7 IMON LASER DIODE DRIVER Adjusting Limit Current See Table 2 TOP VIEW and Eq. 3 SENSE...
  • Page 16 PIN2 DC BIAS THE VOLTAGE SETPOINT INPUT ON PIN TRIMPOT 2 (V ) CAN RESULT IN DAMAGE TO THE WLD3343 OR YOUR LASER DIODE. WLD3343 Equation 7 12. MEASURING LASER DIODE Laser Diode Forward Current Measurement FORWARD CURRENT USING THE...

  • Page 17: Mechanical Specifications

    Dimensions are inches [mm]. PCB FOOTPRINT All tolerances are 5%. 0.945 [24.00] SQ. The WLD3343 can be directly soldered 0.125 [3.18] Thru to a PCB or installed in a socket soldered 0.25 [6.4] DIA KEEPOUT to the PCB. Two 7-pin SIP sockets are 4 Required required.

  • Page 18: Certification And Warranty

    Wavelength will, at its option, either repair or replace products which prove to be defective. LIFE SUPPORT POLICY: As a general policy, Wavelength Electronics, Inc. does WARRANTY SERVICE: not recommend the use of any of its products in life...

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