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www.teamWavelength.com

2

WLD SERIES LASER DIODE DRIVERS

QUICK CONNECT GUIDE

!

To  ensure  safe  operation  of  the  WLD3343 

driver,  it  is  imperative  that  you    determine 

that  the  unit  will  be  operating  within  the 

internal  heat  dissipation 

Safe  Operating 

Area 

(SOA).

Visit the Wavelength Electronics website for the most 

accurate, up-to-date, and easy to use SOA calculator:

www.teamwavelength.com/support/design-tools/soa-ld-calculator/

Enter your operating voltages and currents to determine if 

the system will operate robustly or if heatsinking, fan, or 

lower voltage power supplies are required.

Figure 1 

shows the top view of the WLD3343 driver with pin 

layout and descriptions.

Figure 2

 shows a typical wiring diagram for the WLD3343 

driver to operate a Type A or B laser in Constant Current 

mode. Refer to 

page 13

 and 

page 14

 for additional 

wiring diagrams, including Constant Power wiring diagrams, 

and Type C laser wiring diagrams.

An online circuit calculator tool is available, which 

automatically determines values for external components, 

including R

LIM

, R

SENSE

, V

SET

, along with R

PD

 if operating in 

Constant Power mode:

www.teamwavelength.com/support/design-tools/wld-calculator/

1

2

3

4

5

6

7

14

13

12

11

10

9

8

TOP VIEW

SHD
VSET
IMON
PMON
MODE
LIM
GND

VDD

PD-

PD+

OUTA

RS-

OUTB

RS+

Shutdown Laser Diode Output Current

Setpoint Voltage Input

Laser Diode Current Monitor

Photodiode Current Monitor

Mode Configuration

Laser Diode Current Limit

Power Supply Ground

Power Supply Input
Photodiode Current Sense Resistor Negative Input
Photodiode Current Sense Resistor Positive Input
Output A
Laser Diode Current Sense Resistor Negative Input
Output B
Laser Diode Current Sense Resistor Positive Input

Figure 1.  Top view and pinout of the WLD3343 laser diode driver.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

WLD3343

LASER

DIODE

DRIVER

VDD

R

LIM

1 TIE GROUND CONNECTIONS DIRECTLY TO PIN 7

R

SENSE

ENABLE

DISABLE

IMON

NC

1 k

1

1

1

LD

PD

LD

PD

OR

VDD

D/A

OR

OR

Bandgap

Voltage

Reference

V

SET

1

1

R

PD

I

PD

=

V

PD

+
-

V

PD

R

PD

2k

Part # LM4040

www.national.com

1k

LDMAX

SENSE

I

00

.

1

R

With Eval Board (Rev. Level)

Without Evaluation Board

=

V

SET

 = (Desired I

LD

) * (2*R

SENSE

)

LD Range

 

R

SENSE 

(Rev. C)

2.0 A

200 mA

438 m

5.01 

R

SENSE 

(Rev. A&B)

500 m

5.1 

Figure 2.  Quick Connect Diagram: Type A/B laser diodes in Constant Current mode operation.

VALUE

DETAILS

V

SET

Eq. (9) on page 15

IMON

Eq. (11) on page 15

R

LIM

Eq. (7) on page 11

R

SENSE

Eq. (3) on page 10

Use the online WLD Circuit Calculator to automatically determine 

values for external components.

www.teamwavelength.com/support/design-tools/wld-calculator/

Содержание WLD3343

Страница 1: ...f the WLD3343 laser diode driver Onboard switches connectors and trimpots make the configuration and operation simple Input and output cables are also included with the WLD3393 The WLD3343 is excellen...

Страница 2: ...or 1 2 3 4 5 6 7 14 13 12 11 10 9 8 TOP VIEW SHD VSET IMON PMON MODE LIM GND VDD PD PD OUTA RS OUTB RS Shutdown Laser Diode Output Current Setpoint Voltage Input Laser Diode Current Monitor Photodiode...

Страница 3: ...D VS 2 5 1 ILIM and the power rating of the resistor is found by PRLOAD I2 LIM RLOAD 2 For example if VS is 12 V and the current limit is 2 A then RLOAD needs to be 4 75 with a power rating of 19 W Th...

Страница 4: ...apacitor between this pin and Pin 6 LIM 6 LIM Laser Diode Current Limit A resistor connected between this pin and Pin 7 GND limits the maximum amount of forward current through the laser diode See pag...

Страница 5: ...0 A or 2 mA POWER SELECT Separate or tied power supplies Configures the WLD3393 to either use separate VS and VDD supplies or to tie the VS and VDD connections for single supply operation VSET SOURCE...

Страница 6: ...cale Fall Time 320 ns ILD Full Scale Bandwidth 2 2 MHz CC Sine Wave 2A Slow Start Delay Time 0 24 sec Slow Start Ramp Time 0 01 sec Leakage Current 3 0 mA CONSTANT CURRENT CONTROL Short Term Stability...

Страница 7: ...Heatsink No Airflow 2 2 3 W TAMBIENT 25 C Max Internal Power Dissipation Heatsink Fan 9 9 10 W TAMBIENT 25 C Heatspreader Temperature Rise TAMBIENT 25 C 30 C W No heatsink washer fan 21 5 C W With WHS...

Страница 8: ...erence between the two signals It may be useful to remember that you do not directly set the drive current setpoint instead you adjust a voltage signal that represents the output current The voltage a...

Страница 9: ...1 times the maximum laser diode current plus 150 250 mA for the electronics The HB offers low voltage operation for use with a Lithium ion battery or other low voltage power supplies PREVENT DAMAGE F...

Страница 10: ...NSE CC 1 00 4 ILDMAX ILDMAX CONSTANT POWER RSENSE CONSTANT CURRENT RSENSE 50 mA 25 00 20 00 125 mA 10 00 8 00 250 mA 5 00 4 00 500 mA 2 50 2 00 1 25 A 1 00 0 80 2 2 A 0 57 0 45 WLD3343 3A WLD3343 3L O...

Страница 11: ...y calculate the value of RLIM use Equation 7 and Table 4 for the values of and RLIM ILDLIM RSENSE 1 7 1 ILDLIM RSENSE 1 LASER DIODE TYPE MODE Type A B CC 282 2 85 Type A B CP 350 3 35 Type C CC 290 2...

Страница 12: ...connections TYPE A B TYPE C GND GND RPD RPD VDD OR OR CONSTANT CURRENT TYPE A B TYPE C PD PD GND GND VDD VDD PD PD 7 7 13 13 12 12 14 14 OR PIN 11 WLD3343 WLD3343 OR PIN 10 RPD RPD CONSTANT POWER Figu...

Страница 13: ...ured for Constant Current operation Constant Power 1 2 3 4 5 6 7 14 13 12 11 10 9 8 WLD3343 LASER DIODE DRIVER VDD RPD RLIM 1 TIE GROUND CONNECTIONS DIRECTLY TO PIN 7 RSENSE ENABLE DISABLE IMON PMON 0...

Страница 14: ...B 500 m 5 1 Figure 10 Type C laser configured for Constant Current operation Constant Power 1 2 3 4 5 6 7 14 13 12 11 10 9 8 WLD3343 LASER DIODE DRIVER RPD RLIM 1 TIE GROUND CONNECTIONS DIRECTLY TO P...

Страница 15: ...IPD VPIN2 10 2 RPD MONITORING THE LASER DIODE CURRENT PIN 3 Pin 3 IMON produces a voltage proportional to the current flowing through the laser diode Equation 11 provides a transfer function for conv...

Страница 16: ...ch Output Current Enable Disable Switch Fan Power Input Cable Connector Output Cable Connector Optional Supply Input NOTE LINE UP ARROW WITH LASER TYPE INDICATED ON MAIN BOARD Figure 13 WLD3393 Top Vi...

Страница 17: ...lable options are the 200 mA or the 2 A position PD RANGE Jumper Set the PD RANGE jumper on the bottom of the WLD3393 to either the 200 A or the 2 mA range depending on the specifications of your phot...

Страница 18: ...r to the WHS302 WTW002 WXC303 and or the WXC304 datasheets for assembly instructions Fan Connections Connect the fan leads to the and fan power positions on the terminal block and secure with a small...

Страница 19: ...least twelve turns counter clockwise OFF Adjust the LIM trimpot at least twelve turns clockwise ON D Apply power to the WLD3393 and enable the output current by switching the enable switch to the ON p...

Страница 20: ...nt controls the output of the WLD3343 The setpoint voltage can be adjusted using the onboard SET trimpot applying an external setpoint voltage or by summing the two signals The VSET SOURCE jumper must...

Страница 21: ...the onboard toggle switch The output is enabled when the green ON LED indicator is lit see Figure 13 You can also remotely enable the WLD3343 by connecting a control signal to a via See Figure 19 Thi...

Страница 22: ...A range BANDWIDTH OPTIMIZATION WITH THE WLD3393 EVALUATION BOARD To improve bandwidth shorten the cables Expect 1 8 MHz at 200 mA and 850 kHz at 2 A sine wave 3 dB point with factory length cables PO...

Страница 23: ...sects the VDROP line On the X axis mark value of VS Extend a diagonal line from VS to the intersection of the VDROP and IMAX lines this is the Load Line If the Load Line crosses the Safe Operating Are...

Страница 24: ...C8 1 0 F R27 51 1 C4 4 7 F D5 B0540W VA MODE VDD PDM VA VA R4 332 VA VA R17 499 R16 4 99K R23 1 00M R24 1 00M R22 1 00M R14 1 00M R7 1 00K R9 1 00K R8 1 00K R10 1 00K R6 1 00K 2 3 1 8 4 U4A AD8032 5...

Страница 25: ...thin the Safe Operating Area if VDD is increased Laser does not reach desired output in Constant Power mode Photodiode feedback current is out of range for the WLD Refer to the laser diode datasheet t...

Страница 26: ...to a PCB or installed in a socket soldered to the PCB Two 7 pin SIP sockets are required Wavelength recommends Aries Electronics PN 25 0513 10 WEIGHTS WLD3343 0 6 oz WHS302 Heatsink 0 5 oz WXC 303 4 0...

Страница 27: ...lex 43645 00400 33 5 1 32 23 6 0 93 14 2 0 56 25 4 1 00 1 875 47 63 4 8 0 19 2 25 57 1 2 38 60 5 1 875 47 63 2 25 57 1 1 3 0 05 4 4 0 17 2 48 62 9 4 78 0 188 4 8 0 19 The WLD3343 connects to the evalu...

Страница 28: ...this product NOTICE The information contained in this document is subject to change without notice Wavelength will not be liable for errors contained herein or for incidental or consequential damages...

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