Wavelength Electronics WHS302, Datasheet And Operating Manual

Page: 2 / 28

© 2018 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 Ω
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
Ω
5.01 Ω
R
SENSE
(Rev. A&B)
500 m
Ω
5.1 Ω
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/