Wavelength Electronics PLD10000 User manual

Applies to Product Revisions A - D
© April 2020
ORDERING INFORMATION
PART NO DESCRIPTION
PLD10000 10 A Laser Diode Driver
PLD12500 12.5 A Laser Diode Driver
PLD10EV Evaluation board for PLD10000 and
PLD12500
USBKIT USB Interface kit, with software
RELIABILITY YOU CAN TRUST
The PLD Series Laser Diode Drivers deliver the reliability
and performance you expect from a Wavelength Electronics
laser driver in a compact and easy-to-integrate package.
Tens of thousands of PLD drivers are deployed in laser
systems around the world, proving beyond doubt the
reliability and stability of the design.
PLD Series drivers are used for ber laser pumping,
materials processing, pyrotechnic ignition, industrial
applications, and laser diode LIV testers.
DESIGNED FOR EASY INTEGRATION
The PLD10000 is powered by a 5 V supply, and the laser
can be driven from the same supply. High-compliance
lasers can be driven by using a separate supply up to 30 V.
The PLD12500 requires two separate supplies.
LASER SAFETY FEATURES
Built-in safety features make your product more robust
to real world operating conditions: latching current limit
switches off the output if the current limit is reached; a slow
start circuit ramps the output current; and a mechanical
shorting relay protects the laser from ESD events while the
output is switched off.
Long-term reliability means better up-time, fewer service
calls, and more customers who are satised with your
products.
LOWER CURRENT MODELS
The PLD Series is available in lower current models. Go
to our website for information on the PLD200, PLD500,
PLD1250, PLD5000, and PLD6500 Laser Diode Drivers.
FEATURES AND BENEFITS
• Two models: 10 A and 12.5 A output current
• PLD10000 can be operated from a 5 VDC supply
• Separate power supply can be used to drive
high-compliance lasers, up to 27.5 V
• Product Variation allows high-compliance up to
85V.
• Constant Current or Constant Power modes
• Safety features protect your laser
»Adjustable latching current limit
»Slow-start circuitry
• Remote Enable controls
• Optimized heatsink and fan simplies integration
e
PAGE
Pb
RoHS
Complian
t
CONTENTS
QUICK CONNECT GUIDE 2
PIN DESCRIPTIONS 4
ELECTRICAL SPECIFICATIONS 5
SAFETY INFORMATION 6
OPERATING INSTRUCTIONS 7
ADDITIONAL TECHNICAL INFORMATION 13
TROUBLESHOOTING 18
MECHANICAL SPECIFICATIONS 19
CERTIFICATION AND WARRANTY 20
406-587-4910
www.teamWavelength.com
PLD10000/PLD12500
Laser Diode Drivers
DATASHEET AND OPERATING GUIDE

© 2020 www.teamWavelength.com 2
PLD10000/PLD12500 LASER DIODE DRIVER
QUICK CONNECT GUIDE
!
Toensure safe operaTion of The pLD 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:
https://www.teamwavelength.com/support/design-tools/soa-ld-calculator/https://www.teamwavelength.com/support/design-tools/soa-ld-calculator/
Figure 1 shows the top view of the PLD driver and the
locations of the conguration switches, Output and Current
Limit adjust trimpots, and status LEDs.
Figure 2 shows a typical wiring diagram for the PLD driver
and external electronics to operate a Type A or B laser.
Figure 3 illustrates the three laser types that the PLD can
drive. For detailed instructions on using the different laser
types refer to the Operating Instructions on page 7.
Type A Laser Diode Type B Laser Diode Type C Laser Diode
Common
Cathode
Laser Diode Anode &
Photodiode Cathode Common Isolated Photodiode
Short the
Laser Diode Anode
to Photodiode Cathode
Common
Anode
Laser Diode Cathode &
Photodiode Anode Common
MODE
P
L
I
H
OUT
LIM I
PLD10000 Laser Diode Driver
PD RNG
+5V
Analog In
P Monitor
I Monitor
Common
Lim I Mon
Lim I Stat
LD Enable
PD Aux
Aux V+
GND
LD Anode/
+LD Supply
LD Cathode
PD Anode
PD Cathode
N/C
13
14
15
16
17
18
19
20
21
22
23
24
12
11
10
9
8
7
6
5
4
3
2
1
ENBL
OUT
ADJ
LIM I
ADJ
Output
Adjust (12-turn)
Current Limit
Adjust (12-turn)
Output Enable LED
(Green = ON)
Current Limit Status
LED (Red = LIMIT)
Operating Mode *
PD Range *
L = 15 – 500 µA
H = 50 – 5000 µA
P = Constant Power
I = Constant Current
* DO NOT change switch positions while the output is
enabled; Doing so may damage the laser diode.
!
7,8,9
4,5,6 OR
LD Anode
LD Cathode
13,14,15
22
LD Enable Closed = Output Enabled
Open = Output Disabled
10,11,12
+
+
-
-
+5 V
GND
(Internally Shorted)
16
19
18
21
17
20
Analog Input
P Monitor
(PD Current)
I Monitor
(Output Current)
LIM I Monitor
LIM I Status
Optional External
Setpoint (0 to 5 V)
+
+
-
-
5 VDC
PD Anode 3
0.1 µF
Common
(Low Current)
+5V
10 kΩ
(Pull Up Resistor)
Short pin 16 to pin 19 when
analog input is not used.
PD
LD
PD
LD
Use caution when the PLD is combined with
a
PTC temperature controller: if the TEC
or
thermistor is connected to the laser diode,
two
power supplies are required and must
float
independently of each other.
DMM
Figure 1. PLD Top View and Pin Layout
Figure 2. PLD10000 / PLD12500 Wiring Diagram, Type A/B Lasers
Figure 3. Laser Type Diagrams

© 2020 www.teamWavelength.com 3
PLD10000/PLD12500 LASER DIODE DRIVER
QUICK CONNECT GUIDE, CONTINUED
We recommend using a test load to congure the PLD;
refer to Figure 4. When using the test load, the actual drive
current can be determined by measuring the voltage drop
across the resistor. Do not place an ammeter in series with
the load circuit.
1.5 - 2.5 V Compliance, Current to 15.0 A
Components must be heat-sinked
0.05 Ω, 100 W
STPS20M100ST (2x)
7,8,9
4,5,6
Figure 4. Laser Test Load, Constant Current Mode

© 2020 www.teamWavelength.com 4
PLD10000/PLD12500 LASER DIODE DRIVER
PIN DESCRIPTIONS
Table 1. Pin Descriptions
PIN NAME PIN DESCRIPTION
1 No Connect
2 PD Cathode Photodiode cathode connection for Type C lasers only; see Figure 9 on page 10.
3PD Anode Photodiode anode connection for Type A & B lasers. Photodiode feedback is required for Constant
Power-mode operation. Tie this pin to PD Aux (pin 23) for Type C lasers (see page 10).
4, 5, 6 LD Cathode Laser diode cathode connection.
7, 8, 9 LD Anode /
+LD Supply
Laser diode anode connection. Also used as power supply input for high-compliance lasers.
Maximum input voltage 30 VDC.
On PLD12500, the supply voltage (+5 V) and LD Anode must be separate supplies.
10, 11, 12 GND Power supply ground. Used with +5 V for high current return.
13, 14, 15 +5 V
Supply voltage to control electronics. Range 4.5 to 5.5 VDC. The power supply must be rated to
source at least 1.1-times the laser current plus the PLD quiescent current. On PLD12500, the
supply voltage (+5 V) and LD Anode voltage must be separate supplies.
16 Analog Input
Remote setpoint or modulation input. Transfer function varies by model and operating mode—refer
to Table 2. Range 0 to 5 V. Impedance 1 MΩ. Not TTL-compatible. Connect Analog Input pin to
Common (pin 19) when not using the Analog Input function. The Analog Input signal sums with the
onboard setpoint value. See Electrical Specications for damage threshold information.
17 P Monitor Photodiode Current Monitor (power monitor). Transfer function varies by PD feedback range
setting—refer to Table 2. Range 0 to 2.5 V. Impedance 1 kΩ.
18 I Monitor Laser Diode Output Current Monitor. Transfer function varies by model—refer to Table 2.
Range 0 to 2.5 V. Impedance 1 kΩ.
19 Common Measurement ground. Low current return used only with Monitor pins and Analog Input. Internally
shorted to GND (pins 10, 11, 12).
20 LIM I Monitor
Current Limit Monitor. Transfer function varies by model—refer to Table 2.
Range 0 to 2.5 V. Impedance 1 kΩ. The current limit voltage should be set 0.2 V above the desired
limit level. Instructions for ne-tuning the current limit are on page 13.
21 LIM I Status
Status output pin. Indicates if the driver has reached current limit and has switched off the output.
Signal is < 0.3 V if the driver is in limit and output is latched off; signal is at 5 V when output is not
in limit. Toggle LD Enable to reset the limit circuit and enable the output current.
22 LD Enable Output Enable. Disable = ground or oating. Enable = 3 to 5 V.
Requires 5 mA input current. Not TTL-compatible.
23 PD Aux For TYPE C Laser Diodes only. See Figure 9 on page 10.
24 Aux V+ For TYPE C Laser Diodes only. See Figure 9.
Table 2. Current Output Monitor, Limit Monitor, Photodiode Current Monitor, and
Analog Input Transfer Functions
FUNCTION MODE PLD10000 PLD12500
LIM I Monitor (Current Limit) CC / CP 4.6 A / V 5.0 A / V
I Monitor (Output Current) CC / CP 4.6 A / V 5.0 A / V
Analog Input; CC-Mode CC 2.3 A / V 2.5 A / V
Analog Input CP-Mode; Low Range CP 100 µA / V
Analog Input, CP-Mode; High Range See Note CP 1 mA / V
P Monitor (Photodiode Current); Low Range CC / CP 200 µA / V
P Monitor (Photodiode Current); High Range See Note CC / CP 2 mA / V
Note: High Range is not available when using Type C Lasers.

© 2020 www.teamWavelength.com 5
PLD10000/PLD12500 LASER DIODE DRIVER
ELECTRICAL SPECIFICATIONS
PARAMETER SYMBOL MIN TYP MAX UNIT NOTE
ABSOLUTE MAXIMUM RATINGS
Supply Voltage1+5 V 5.0 to 5.5 VDC
Supply Voltage,
LDA High Compliance1, 2
LD Anode /
+LD Supply 3.0 to 30 VDC
Consult Safe Operating
Area calculator for supply
voltages > 5 VDC
Supply Voltage, Type C Lasers Aux V+ 8.0 to 12.5 VDC
Operating Temperature Range3TOPR 0 to 50 ºC
Storage Temperature Range TSTG -55 to 125 ºC
Weight 8.4 oz 235 grams
Size 3.35 x 3.20 x 1.93 in 85.1 x 81.3 x 49.0 mm
MODEL
PARAMETER PLD10000 PLD12500 UNIT
DRIVE CURRENT OUTPUT
Maximum Internal Power Dissipation 110 110 W
Maximum Output Current 10 12.5 A
Compliance Voltage
2.5 V max with 5 VDC power supply voltage
27.5 V max with 30 VDC power supply voltage
85 V max with Product Variation
V
Short Term Stability, 1 hour,
Constant Current Mode < 200 < 300 ppm
Quiescent Current 250 250 mA
Temperature Coefcient < 200 ppm
Noise & Ripple4> 45 µA
PHOTODIODE FEEDBACK
High Range Photodiode Input Current 50 – 5000 µA
Low Range, Type A & B Lasers Only 15 – 500 µA
Short Term Stability, 1 hour,
Constant Power Mode < 0.05 < 0.05 %
EXTERNAL MODULATION
Analog Input Damage Threshold VIN< -0.5 or VIN > (0.5 V above Supply Voltage on Pin 15) V
Input Pin Impedance 1 MΩ
Bandwidth, 3 dB590 70 kHz
Depth of Modulation at 60 kHz690 %
Rise Time 7 7 µsec
Fall Time 8 8 µsec
TIMING CHARACTERISTICS7,8
Output Turn-on Delay ≥1.5 seconds
Slowstart Output On-Time 250 msec
Disable Fall Time >100 µsec
MONITOR ACCURACY
Monitor Voltage vs. Expected Output
based on transfer function 2 % of Full Scale
1. Single 5 VDC supply operation is possible with PLD10000. Two supplies are required for PLD12500. See page 7 for Dual power supply operation.
2. Use two supplies with PLD10000 when driving high-compliance lasers, or when lower drive current noise is required. PLD12500 requires two supplies.
3. PLD12500 maximum operating temperature is 35ºC.
4. Not recommended for low noise applications. See the LDxCHA webpage for lower noise laser
drivers
5. Modulation bandwidth in Constant Power mode will depend on the photodiode frequency response.
Photodiode specications vary widely from one manufacturer to another, but the bandwidth in
Constant Power mode is typically 10% of the Constant Current bandwidth.
6. Peak-to-Peak output amplitude decreases as frequency increases. See gure at right.
7. See page 16 for timing graphs.
8. See page 15 for revision A & B timing characteristics.
0 mA
Full Current
100% Depth of Modulation at 10 Hz
100 %
0 %
90% Depth of Modulation at 60 kHz
90 %
95 %
5 %

© 2020 www.teamWavelength.com 6
PLD10000/PLD12500 LASER DIODE DRIVER
SAFETY INFORMATION
SAFE OPERATING AREA — DO NOT EXCEED
INTERNAL POWER DISSIPATION LIMITS
Before attempting to operate the PLD driver, it is imperative
that you rst determine that the unit will operate within the
Safe Operating Area (SOA). Operating outside of the SOA
may damage the PLD and the laser. Operating outside of
the SOA will void the warranty.
To determine if the PLD driver is suitable for your application
and if it will be operating in the safe range, consult the online
instructions for calculating the Safe Operating Area:
https://www.teamwavelength.com/support/design-tools/soa-ld-calculator/https://www.teamwavelength.com/support/design-tools/soa-ld-calculator/
SOA charts are included in this datasheet for quick reference
(page 17), but we recommend you use the online tools
instead.
!
Toensure safe operaTion of The pLD Driver, iT is
imperaTive ThaT you DeTermine if The uniT is going To
be operaTing wiThin The inTernaL heaT DissipaTion
safe operaTing area (soa).
If you have any questions about the Safe Operating Area
calculator call the factory for free and prompt technical
assistance.
THEORY OF OPERATION
The PLD10000 and PLD12500 drivers are controlled
linear-mode current sources: they deliver the current
commanded by the setpoint. The current source continually
monitors the actual output current, compares it to the
setpoint, and adjusts the current if there is a difference
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 and output
current are related by a transfer function that varies by driver
model number.
The setpoint voltage is adjusted with the onboard trimpot or
by an external input that sums with the onboard setpoint.
The adjustable current limit is set using an onboard trimpot.
As current is driven through the load, there is a voltage drop
across the load because of the impedance. As the current
increases, the voltage drop may increase to the point that it
reaches the Compliance Voltage limit of the current source.
Once that occurs the current source is no longer able to
increase the current driven to the load even if you increase
the setpoint.
The PLD driver includes features that help protect your
laser and make the driver more versatile in a wide array of
applications:
• The user-adjustable latching current limit protects the
laser from over-current situations by switching off the
output when a limit condition is detected. Toggling the
Enable resets the current limit circuit.
• Output current switches on after approximately 1.5
seconds from the time the Enable signal is applied.
• Output slow-start ramps the current to setpoint over
250 msec.

© 2020 www.teamWavelength.com 7
PLD10000/PLD12500 LASER DIODE DRIVER
OPERATING INSTRUCTIONS
If you are using the driver on the benchtop or for prototyping
your laser control system, we recommend using the
PLD10EV board.
The driver is rst congured for local control in order to
set the drive current limit. Then the driver is recongured
according to the actual application.
We recommend using a test load until you are familiar with
operation of the driver. Refer to page 3 for test load
schematics.
NECESSARY EQUIPMENT
The following equipment is the minimum necessary to
congure the PLD for basic operation:
• PLD controller
• PLD10EV evaluation board (recommended)
• Digital multimeter, 4-½ digit resolution recommended
• Test load for conguring the driver; laser diode, mount,
and laser temperature controller
• Connecting wires
• Power Supplies (see below)
POWER SUPPLY REQUIREMENTS
Linear-regulated or low-noise switching power supplies can
be used. We recommend using power supplies with noise
specications suitable for your application.
For single-supply operation (PLD10000 only):
• 5 VDC power supply rated for 1.1-times the maximum
laser diode current, plus 250 mA for the electronics
For the PLD12500, or to drive a high-compliance laser with
the PLD10000:
• 5 VDC power supply rated for > 250 mA
• Power supply rated for 1.1-times the maximum laser
diode drive current and > 2.5 V greater than the
compliance voltage of the laser
NOTE: For dual supply operation, it is critical to shut
down the power supply to the laser rst before shutting
down the +5V supply powering the electronics. Failure
to follow this order may damage the PLD or laser.
SAFE OPERATING AREA AND
THERMAL DESIGN CONSIDERATIONS
SOAcharts are included in this datasheet for quick reference,
but we recommend you use the online tools instead:
https://www.teamwavelength.com/support/design-tools/soa-ld-calculator/https://www.teamwavelength.com/support/design-tools/soa-ld-calculator/
!
iTis imperaTive ThaT you verify The uniT wiLL operaTe
wiThin The inTernaL heaT DissipaTion safe operaTing
area (soa).
operaTing The Driver ouTsiDe The soa may Damage
or DesTroy The Driver anD/or Laser.
PREVENT DAMAGE FROM ELECTROSTATIC
DISCHARGE
Before proceeding, it is critical that you take precautions to
prevent electrostatic discharge (ESD) damage to the driver
and your laser. ESD damage can result from improper
handling of sensitive electronics, and is easily preventable
with simple precautions.
Enter the search phrase ESD Precautions for Handling
Electronics in an internet search engine to nd information
on ESD-safe handling practices.
We recommend that you always observe ESD precautions
when handling the PLD driver and your laser diode.

© 2020 www.teamWavelength.com 8
PLD10000/PLD12500 LASER DIODE DRIVER
INSTALL THE PLD ON THE PLD10EV BOARD
Align the pins of the PLD with the plated holes on the
evaluation board, making sure all pins are aligned before
seating the PLD on the board.
!
verify ThaT The pLD is properLy orienTeD on The
boarD, wiTh pin 1 aT The correcT LocaTion. refer To
Figure 5.
Next, insert the two 4-40 x ¼” screws through the tabs on
the PLD and into the threaded inserts on the PCB; then
tighten. Finally, solder the PLD pins to the PLD10EV board.
It is essential to mechanically secure the PLD to the circuit
board with the 4-40 x ¼” screws. The electrical pins alone
do not provide sufcient mechanical strength to secure the
PLD to the circuit board.
CONFIGURE THE PLD10EV BOARD FOR
YOUR APPLICATION
If you are using the PLD10EV evaluation board to familiarize
yourself with operating the PLD10000 or PLD12500, follow
these instructions to congure the jumpers on the evaluation
board. Refer to Figure 5.
• Laser Type-Select Jumper. Remove this jumper for
Type A/B laser operation. Install the jumper to tie pin 3
to pin 23 for Type C laser operation. The factory default
conguration is with the jumper removed.
• LD Power Supply Jumper. To operate the PLD and
laser from a single 5 VDC power supply, install this
jumper. If you are operating a high-compliance laser
with a separate power supply, remove the jumper. The
jumper must be removed when using the PLD12500.
The factory default conguration is with the jumper
installed.
(GND)
VCC
(GND)
-+
Connector
AUX VCC
-+ VCC
NC
PD ANODE
PD CATHODE
ANALOG INPUT
I MONITOR
COMMON MON(-)
LIM I MONITOR
LIM I STATUS
LD ENABLE
PD AUX
AUX V+
P MONITOR
LD +5V SUPPLY JUMPER
MONITOR-
MONITOR+ LIM I MON
POWER
LASER CONNECT
LDC
LD SUPPLY
LDA/
OUTPD AUX
LASER DISABLE
LASER ENABLE
I MONITOR
P MONITOR
PLD10EV-00600-A REV B
POWER
ON
ON OFF
1
S3
S2
S1
R2
JP2
JP1
J4
J2
J1
D1 J3
P
L
I
H
PLD10000 Laser Diode Driver
MODE
H
OUT
LIM I
PD RNG
ENBL
OUT
ADJ
LIM I
ADJ
Output
Current
DISABLE
ENABLE
Monitor
Select
PD CURRENT
LD CURRENT
Test Points
Power
ON OFF
Power
LED
Laser Connection
Use 14 AWG minimum
CATHODE
ANODE
Laser Type-C Jumper
Install ONLY for Type-C Lasers,
Shown here for Type A/B Lasers
Power Supply Input
Use 14 AWG minimum
Power Supply Shorting Bar
Install jumpter to tie +5 V pins (13,14,15)
to +LD Supply pins (7,8,9).
Screw Lock Connectors
Use 22 AWG minimum
Power Supply Input
Pads for custom
connector installation
C2
Figure 5. PLD10EV Evaluation Board
WIRE THE PLD LASER DRIVER
Refer to Table 3 for wiring instructions specic to your
conguration. For setup and conguration use a test load.
The same wiring instructions apply whether the PLD is
used on the PLD10EV board or installed on a custom circuit
board.
Table 3. Wiring Congurations
CONFIGURATION DIAGRAM
Type A & B Laser Diode,
Single 5 VDC Power Supply Figure 6
Type A & B Laser Diode,
High-Compliance Laser Diode Figure 7
Type A & B Laser Diode,
Negative Supply Operation Figure 8
Type C Laser Diode,
Single Power Supply Figure 9

© 2020 www.teamWavelength.com 9
PLD10000/PLD12500 LASER DIODE DRIVER
7,8,9
4,5,6 OR
LD Anode
LD Cathode
13,14,15
22
LD Enable Closed = Output Enabled
Open = Output Disabled
10,11,12
+
+
-
-
+5 V
GND
(Internally Shorted)
16
19
18
21
17
20
Analog Input
P Monitor
(PD Current)
I Monitor
(Output Current)
LIM I Monitor
LIM I Status
Optional External
Setpoint (0 to 5 V)
+
+
-
-
5 VDC
PD Anode 3
0.1 µF
Common
(Low Current)
+5V
10 kΩ
(Pull Up Resistor)
Short pin 16 to pin 19 when
analog input is not used.
PD
LD
PD
LD
Use caution when the PLD is combined with
a
PTC temperature controller: if the TEC
or
thermistor is connected to the laser diode,
two
power supplies are required and must
float
independently of each other.
DMM
Figure 6. Type A & B Laser Diode, Single 5 VDC Power Supply
7,8,9
4,5,6
LD Anode
LD Cathode
13,14,15
22
LD Enable
10,11,12
+5 V
GND
(Internally Shorted)
16
19
18
21
17
20
Analog Input
LIM I Monitor
LIM I Status
+
+
-
-
PD Anode 3
Common
(Low Current)
PD
LD
OR
Closed = Output Enabled
Open = Output Disabled
+
+
-
-
10µF
+5V
0.1µF
12 to
30 VDC
Heatsinking
Required
LM 317
+5V REG.
732Ω
243Ω
1
3
2
330µF
0.1µF
This circuit shows how to use a single power supply.
The LM317 (+5 V Regulator) circuit can be replaced
with a separate 5 VDC power supply.
PD
LD
Use caution when the PTC is combined with a PLD
laser driver: if the TEC or thermistor is connected to
the laser diode, two power supplies are required and
must float independently of each other.
Short pin 16 to pin 19 when
analog input is not used.
+5V
10 kΩ
(Pull Up Resistor)
DMM
P Monitor
(PD Current)
I Monitor
(Output Current)
Optional External
Setpoint (0 to 5 V)
Figure 7. Type A & B Laser Diode, High-Compliance Laser Diode
NOTE: For dual supply operation, it is critical to shut down the power supply to the laser rst before shutting down the +5V
supply powering the electronics.

© 2020 www.teamWavelength.com 10
PLD10000/PLD12500 LASER DIODE DRIVER
7,8,9
4,5,6 OR
LD Anode
LD Cathode
13,14,15
22
LD Enable Closed = Output Enabled
Open = Output Disabled
10,11,12
-
-
+
+
+5 V
GND
(Internally Shorted)
16
19
18
21
17
20
Analog Input
LIM I Monitor
LIM I Status
+
+
-
-
5 VDC
PD
LD
PD Anode 3
0.1 µF
Common
(Low Current)
GND
PD
LD
Short pin 16 to pin 19 when
analog input is not used.
Use caution when the PTC is combined
with a PLD laser driver: if the TEC or
thermistor is connected to the laser diode,
two power supplies are required and must
float independently of each other.
10 kΩ
Pull Up Resistor
DMM
P Monitor
(PD Current)
I Monitor
(Output Current)
Optional External
Setpoint (0 to 5 V)
Figure 8. Type A & B Laser Diode, Negative Power Supply Operation
7,8,9
4,5,6
LD Anode
LD Cathode
13,14,15
22
LD Enable
10,11,12
+5 V
GND
(Internally Shorted)
16
19
18
21
17
20
Analog Input
LIM I Monitor
LIM I Status
+
+
-
-
PD Cathode 2
Common
(Low Current)
PD
LD
OR
Closed = Output Enabled
Open = Output Disabled
+
+
-
-
10µF
+5V
0.1µF
8 to
12 VDC
Heatsinking
Required
LM 317
+5V REG.
732Ω
243Ω
1
3
2
330µF
0.1µF
This circuit shows how to use a single power supply.
The LM317 (+5 V Regulator) circuit can be replaced
with a separate 5 VDC power supply.
PD
LD
24
Aux V+
323
PD
Anode
PD
Aux
Use caution when the PLD is combined with a
PTC
temperature controller: if the TEC or thermistor
is
connected to the laser diode, two power supplies
are
required and must float independently of each other.
Short pin 16 to pin 19 when
analog input is not used.
Optional External
Setpoint (0 to 5 V)
+5V
10 kΩ
(Pull Up Resistor)
DMM
P Monitor
(PD Current)
I Monitor
(Output Current)
Figure 9. Type C Laser Diode
NOTE: For dual supply operation, it is critical to shut down the power supply to the laser rst before shutting down the +5V
supply powering the electronics.