Wavelength Electronics WLD3393 Manuel utilisateur

WLD3393 DEMO BOARD FOR THE WLD3343

WLD3393-00400-A Rev F

GENERAL DESCRIPTION:

Use the WLD3393 Demo Board to rapidly

prototype a complete laser diode control system

using the cutting edge technology of the

WLD3343 Laser Diode Driver. Onboard

switches, connectors, and trimpots make

conﬁguration and operation simple. Input and

output cables are also included.

Operate in either constant current (CC) or

constant power (CP) mode. An onboard

12-turn trimpot allows ﬁne adjustment of laser

diode forward current (CC Mode) or monitor

photodiode current (CP Mode). Another trimpot

sets the laser diode forward current limit. The

input cable allows easy connection to your

power supply and monitoring equipment while

the output cable quickly connects to your laser

diode and monitor photodiode.

High power applications can use the onboard

fan connector to power a WXC303 or WXC304

(+5 VDC or +12 VDC) fan attached to a WHS302

heatsink.

August, 2009

Figure 1: Top View

WLD3343 Laser Diode Driver

Demo Board

WLD3393 Rev B

FEATURES:

• Operates all Laser Diode Pin Conﬁgurations

• Two Conﬁgurable Output Current Ranges

(200 mA or 2.0 Amps)

• Constant Current or Constant Power Operation

• Onboard Current Setpoint Trimpot

• Adjustable Current Limit

• Enable/Disable Switch and LED

• Includes Input/Output Cable Set

• Includes a Fan Connector

• Easily Connects to an External Control

Potentiometer or Voltage Source

WLD3343 NOT INCLUDED

A/B TYPE

SET

WLD3343

P MON

I MON

COM

PGND

VDD

PDC

PDA

LDC

LDA

WAVELENGTH

WLD3393

ELECTRONICS

ONLY

(-)

(+)

FAN

PMON

SET

2.5

PDM

COM

LIM

WITH

ENABLE

IMON OFF

USE

1Index Marker

WLD 3393

Sockets

INDICATED

ON MAIN BD

LASER TYPE

ARROW W/

LINE UP

NOTE

Mode

Switch

Output Current

Enable/Disable

Switch

Fan

Terminals

Configuration

Board

Laser Diode

Input Cable Connector

Output Cable Connector

RoHS

Com

liant

WLD3393

PAGE 2

WLD3393-00400-A Rev F

THIS DRAWING AND INFORMATION CONTAINED THERIN ARE THE PROPERTY OF WAVELENGTH ELECTRONICS, INC. (WEI). BY ACCPTING THIS

INFORMATION, THE BORROW ER AGREEES THAT IT WILL NOT BE USED FOR ANY PURPOSE OTHER THAN FOR WHICH IT WAS LOANED. IF THE

BORROWER OF THIS DOCUMENT HAS NOT SIGNED A CONFIDENTIALITY AGREEMENT WITH W EI, THE HE/SHE MUST REPORT THIS FACT TO WEI.

WLD 3393 C DEMO BD FOR WLD3343

SIZE

WLD3393-00100-C10

SIGNATURE DATE

ORIGINATOR

ENGINEERING

CHECKED

APPROVED

TITLE

DWG (PRR) NO.

SCALE SHEET

REV

OF 1

APPROVED

APPROVALS

SIZE BDWG (PRR) NO. REVSH

12345 6

WLD3393-00100-C10

REV CHANGEDDATE

REVISION HISTORY

APPROVEDDESCRIPTION / DOCUMENTATION

11 2H

SHD

VSET

IMON

PMON

MODE

LIM

GND

7RS+ 8

RS- 10

A11

PD+ 12

PD- 13

VDD 14

U1 WLD3343

Output Connector

Input Connector

R111k

3.32k

R15

150

R164.99k

R17 499

68uF

CCW

R20

CCW

R21

500

VDD

GREEN

VDD

VDDVS

C4 0.1uF

2.5V

R7 1k

R12

10k

R9 1k

R10

LDA

LDC

PDA

PDC

68uF

U4A

AD8032AR

U2A

AD8032AR

U2B

AD8032AR

U4B

AD8032AR

LDA

PDA

PDC

LDC

IMON

PMON

R18

R13

R19

SET I

LIM A

W W Hunter

R14 1.00M

R22

1.00M

R23

1.00M

R24

1.00M

R1 5

R2 0.5

A Original Release

Redesign to eliminate config bd

F:\eng\Protel\Demo bds\WLD3393 C.ddb - WLD3393 C 2H.SCH

11-Jun-2003 09:01:01

TERMINAL BLOCK

2.5V

SETV

PD LSR

I MON

PMON

VDD

PMON

I MON

-- 1

LM4040CIM3-2.5

SW1

SW EG4208

JP5

HEADER 3 SEL

JP4

HEADER 3 SEL

JP3

HEADER 3 SEL 1 2

3 4

JP1

HEADER 2X2

1 2

3 4

JP6

SOCKET 534206-2

1 2

3 4

JP8

SOCKET 534206-2

1 2

3 4

5 6

JP2

HEADER 3X2

1 2

3 4

5 6

JP7

SOCKET 534206-3

1 2

3 4

5 6

JP9

SOCKET 534206-3

RPD+

RPD-

PD+

PD-

MODE

LIM

RS-

RS+

VSET

EXT SET

SET BIAS

SHD

PDL

3S1

SW GT11MCKE

Shown in CC

R3 10k

FAN +

FAN -

Not released

30 May 2003

Figure 2: WLD3393 Schematic

VSET

WLD3393

PAGE 3

WLD3393-00400-A Rev F

CONFIGURING THE DEMO BOARD

STEP 1: INSTALL the WLD3343 on the demo board

Match up the notch in the WLD3343 with the index marker shown in Figure 3. Align the WLD3343 pins

with the WLD3393 sockets ensuring that all pins are lined up. Press ﬁrmly to seat the WLD3343. Make

sure that none of the pins of the WLD3343 were bent during insertion before continuing.

SETUP INFORMATION

To set up the WLD for your project, you’ll need a few pieces of information. Here’s a handy list of what

you’ll need to know before you start wiring [it’s also good to have this information if you need to call for

technical support].

Description

Laser Diode Conﬁguration

Laser Diode Max Current

Operating LD Current

Operating PD Current

Operating Mode

Power Supply Voltage

Value in your

application

A B or C

CP or CC

Notes

See Figure 4 for schematics. If you have no photodiode, follow instructions for

Type A laser diodes.

If greater than 200mA, make sure to check the SOA curve in the WLD3343

datasheet and use a Thermal Solutions kit (Fan, Heatsink, and Thermal

Washer) or equivalent

Constant Current: Laser diode current is ﬁxed, power varies.

Constant Power: Laser diode current varies. Photodiode current is ﬁxed.

Power output is ﬁxed.

If greater than 5V, make sure to check the SOA curve in the WLD3343

datasheet and use a Thermal Solutions kit (Fan, Heatsink, and Thermal

Washer) or equivalent. An online tool for calculating the WLD3343 Safe

Operating Area is available at:

http://www.teamwavelength.com/support/calculator/soa/soald.php

Follow the next ten steps sequentially to safely operate the WLD with your laser

diode. Complete steps 1 through 4 before applying power to the board.

A/B TYPE

SET

WLD3343

P MON

I MON

COM

PGND

VDD

PDC

PDA

LDC

LDA

WAVELENGTH

WLD3393

ELECTRONICS

ONLY

(-)

(+)

FAN

PMON

SET

2.5

PDM

COM

LIM

WITH

ENABLE

IMON OFF

USE

1Index Marker

WLD3393

Sockets

Figure 3: Location of Index Marker and sockets; Standoff assembly

4-40 x 0.625” NYLON

STANDOFFS

4 REQUIRED

WLD3393

PAGE 4

WLD3393-00400-A Rev F

CONFIGURING THE DEMO BOARD

STEP 2: CONFIGURE FOR CONSTANT CURRENT OR CONSTANT POWER MODE

The two modes of operation supported by the WLD3393 are constant current and constant power

mode. It is very important to note that the WLD3393 should be conﬁgured for either constant

current or constant power mode BEFORE power is applied. Changing operating mode while

the WLD3393 is operating can result in damage to your laser diode. In constant current mode,

VSet correlates directly to the laser diode current, regardless of laser diode power intensity. In constant

power mode, the WLD controls the laser diode using the photodiode to achieve a laser intensity that

is directly proportional to VSet.

Constant Current mode ignores the laser’s photodiode. The WLD3393, however, is designed to allow

you to monitor the laser’s photodiode while running in this mode. Monitor the voltage at the PDM pin on

the terminal block on the top side of the WLD3393. Before powering the unit on to operate in constant

current mode, make sure that the mode switch is in the CC position (see Figure 1). Select the output

current range by setting the LD RANGE jumper on the back of the WLD3393 to either the 200mA or

the 2A position. See Figure 4 for location.

Constant power mode utilizes the laser’s photodiode to regulate the intensity of the laser in proportion

to VSet. While the unit is NOT powered, make sure the mode switch is in the CP position to conﬁgure the

WLD3393 for constant power mode (see Figure 1). Set the PD RANGE jumper on the bottom of the

WLD3393 to either the 200μA or the 2mA range, depending on the speciﬁcations of your photodiode.

See Figure 6 for the location of the PD Current Range jumper. It is important to make sure that

the correct PD current range is selected as the WLD3393 may overdrive the laser if the PD range

is conﬁgured incorrectly, resulting in permanent damage to the laser. Use the LD RANGE jumper to

select between the 200mA and 2A range based on the rating of the laser load. See Figure 4 for the

location of this jumper.

Figure 4: Bottom View, Jumper Locations

VSET

SOURCE

JUMPER

LD RANGE

JUMPER

PD RANGE

JUMPER

WLD3393

PAGE 5

WLD3393-00400-A Rev F

CONFIGURING THE DEMO BOARD

STEP 3: INSTALL THE LASER DIODE CONFIGURATION BOARD

CAUTION: If the WLD3393 is conﬁgured incorrectly for the type of laser diode you are using,

damage can result to your laser diode and/or the WLD3393. Refer to Figure 5 to determine the

type of laser diode being used. To conﬁgure the WLD3393 for your laser diode type, connect the

conﬁguration board to the bottom of the WLD3393 so that the arrow on the protruding edge of the

conﬁguration board points to either A/B or C. Refer to Figure 6 for example installation.

A/B TYPE

SET

WLD3343

P MON

I MON

COM

PGND

VDD

PDC

PDA

LDC

LDA

WAVELENGTH

WLD3393

ELECTRONICS

ONLY

(-)

(+)

FAN

PMON

SET

2.5

PDM

COM

LIM

WITH

ENABLE

IMON OFF

USE

Setup for type C laser diodes

Setup for type A/B laser diodes

WITH

ONLY

WLD3393

WAVELENGTH

LDA P MON

WLD3343

SET

FAN

I MON

IMON

COM

PDM

2.5

SET

PMON

(+)

(-)

LDC

PDA

PDC

LIM

A/B TYPE

ENABLE

VDD

PGND

COM

USE

OFF

ELECTRONICS

Figure 5: Laser Diode Type Schematics: A/B or C

Figure 6 - Examples of proper alignment of Laser Diode Conﬁguration Board

Type A Laser Diode Type B Laser Diode Type C Laser Diode

Common

Cathode

Laser Diode Anode &

Photodiode Cathode Common Isolated Photodiode

Short

Laser Diode Anode

to Photodiode Cathode

Common

Anode

Laser Diode Cathode &

Photodiode Anode Common

WLD3393

PAGE 6

WLD3393-00400-A Rev F

STEP 4: ATTACH THE HEATSINK AND FAN (optional for less than +5V, 200mA operation)

HEATSINK REQUIREMENTS. The WLD3343 is designed to handle currents as high as 2.2A. The

WLD3393 demo board, however, limits output current to 2.0A. Attach a heatsink (such as WHS302

with thermal washer WTW002) to the WLD3343 when driving currents higher than 500mA. Attach a

fan (such as WXC303 (+5VDC) or WXC304 (+12VDC)) to the heatsink for output currents exceeding

1.0A. If using Wavelength accessories, refer to the WHS302, WTW002, WXC303, and / or the

WXC304 datasheets for assembly instructions.

FAN CONNECTIONS. Connect the fan leads to the (+) and (-) fan terminal positions on the terminal

block and secure with a small ﬂat head screwdriver. The fan connects to the VDD supply, not VS, so care

must be exercised to ensure that the proper fan is selected, either +5VDC or +12VDC, when using

dual power supplies. Optionally, for lower noise operation, the fan leads may be connected directly to

a separate power supply compatible with the fan.

STEP 5: ATTACH THE VDD AND VSPOWER SUPPLIES

The WLD3393 has two power supply connections, VSand VDD. VSprovides power for driving the

laser (minimum current capacity greater than limit current setting). VDD provides power to the control

electronics (minimum 100mA). VDD can range from +5 to +12V. VScan range from +4.5 to +12V. For

simple operation tie VDD to VS. Use PGND for the power return. The common (COM) terminal on the

WLD3393 is not intended to act as a power connection, but as the low noise ground reference for

connecting an external VSET source, and for monitoring the IMON, PMON, and PDM signals.

A separate VSpower supply allows the output current stage to operate below the minimum 5V required

for the control electronics or up to the +12V maximum (for multiple laser diodes in series). Select VS

approximately 2.0 volts above the maximum voltage drop across the laser diode to reduce the power

dissipation in the WLD3343 component and minimize your heatsinking requirements. Note that for

type C laser diodes in Constant Power mode VDD must be greater than or equal to VS to keep the pho-

todiode signal in range.

NOISE REDUCTION. For better performance, to reduce noise in the control electronics, it is

recommended to connect VDD and VS together at the power supply, running separate wires for VDD and

VS. Grounding the heatspreader also can reduce noise. With WLD3393 Rev. B, the screw threads

contact a grounded PEM on the board; no ground strap is necessary.

CONFIGURING THE DEMO BOARD

WLD3393 Rev A

WLD3393 Rev B

Figure 7: Grounding the heatspreader for noise reduction

WLD3393

PAGE 7

WLD3393-00400-A Rev F

STEP 6: SET THE LASER DIODE CURRENT LIMIT

The WLD3393 LIM trimpot adjusts the laser diode current limit from zero to the full 200 mA or

2.0 Amps, depending on the laser diode current range selected. For accurate laser diode current limit

conﬁguration follow these steps sequentially:

1. Connect the demo board’s LDA and LDC terminals directly to an ammeter capable of sensing

your maximum laser diode current. If you are using more than +5VDC power supply

voltage, place a resistor in series with the ammeter to reduce power dissipation across the

WLD. The following equations should be used.

Example calculation: VS= +12V, ILIM = 2A; RLOAD = (12-2.5)/2 = 4.75 ohm; 22*4.75= 19W

Another example: VS= +9V, ILIM = 0.5A; RLOAD = (9-2.5)/0.5 = 13 ohm; (0.5)2*13 = 3.25W

2. Conﬁgure the demo board for Constant Current (CC) mode operation. See Step 2.

3. Turn the SET trimpot fully counter clockwise (OFF). Adjust the LIM trimpot fully clockwise

(ON).

4. Apply power to the WLD3393 and enable the output current by switching the enable switch to

the “ON” position. See Figure 1 to locate the switch.

5. Turn the SET trimpot clockwise until the desired maximum current is achieved. Turn

the LIM trimpot counter clockwise until the current just begins to decrease. Turn the

SET trimpot back fully counterclockwise.

6. Disable the output current by switching the enable switch to the “OFF” position. Remove power

from the WLD3393.

STEP 7: CONNECT THE LASER DIODE AND MONITOR PHOTODIODE

With power removed from the WLD3393 board, connect the output (4 wire cable) to your laser diode

as indicated in Table 1. Firmly press the output cable into the output connector.

CONFIGURING THE DEMO BOARD

Table 1: Output Cable color code

Wire Color FunctionPIN #

RED

GREEN

WHITE

BLACK

LDA

PDC

PDA

LDC

RLOAD = VS- 2.5

ILIM

RLOAD power rating = I2

LIM* RLOAD

WLD3393

PAGE 8

WLD3393-00400-A Rev F

STEP 8: MONITOR THE LASER DIODE AND PHOTODIODE CURRENTS

The input connector includes three signals for externally monitoring the WLD3343 laser driver output.

IMON, PMON, and PDM allow for monitoring of laser diode current and power intensity depending on

the selected mode of operation. The voltages at IMON, PMON, and PDM are all referenced to the

common terminal (COM) on the input connector.

IMON provides a mechanism for externally monitoring the laser diode current. IMON is available at all

times in both CC and CP modes. In the 200mA range, VIMON has a transfer function of 100mA/V. In the

2.0A range, VIMON has a transfer function of 1.0A/V. Table 3 summarizes this data.

PMON provides an external indication of the laser diode intensity by measuring photodiode current.

Since PD+ and PD- on the WLD3343 are shorted together in CC mode, PMON will only monitor

photodiode current in CP mode. When operated in the 200μA range, VPMON has a transfer function

of 100μA/V. When operated in the 2mA range, VPMON has a transfer function of 1mA/V. Table 4

summarizes this data.

PDM provides a mechanism for monitoring photodiode current in either CC or CP mode. While PMON

monitors the feedback used by the control electronics to maintain constant power of the laser, PDM

is an external monitor that is independent of the control electronics of the WLD3343. The transfer

function for VPDM to IPD is the same as for the PMON signal. PDM is only accessible on the terminal

block.

200 mA Range 2.0 Amp Range

200 µA Range 2 mA Range

LDI = V IMON * 100 [ mA ] LDI = V IMON [ AMPS ]

PDI = V PMON * 100 [ µA] PDI = V PMON [ mA ]

CONFIGURING THE DEMO BOARD

Wire Color FunctionPIN #

BLUE

ORANGE

RED

BLACK

WHITE

GREEN

PGND

VDD

COM

P MON

I MON

Table 2: Input Cable color code

Table 3: Convert IMON voltage to Laser Diode Current

Table 4: Convert PMON or PDM voltage to Photodiode Current

WLD3393

PAGE 9

WLD3393-00400-A Rev F

STEP 10: ENABLE OR DISABLE THE OUTPUT CURRENT

The WLD3343 output current can be enabled and disabled using the onboard toggle switch. The

output is enabled when the green ON LED indicator is lit (see Figure 1).

CHARACTERIZE YOUR LASER DIODE. Conﬁgure the WLD3393 for Constant Current mode. Step

the external voltage setpoint to scan laser diode current. Monitor the intensity of the laser diode using

PDM.

STEP 9: ADJUST THE SETPOINT VOLTAGE

The setpoint controls the output of the WLD3343. In constant current mode the setpoint is directly

proportional to the laser diode current. In constant power mode the setpoint is directly proportional to

photodiode current, allowing for control of the power of the light emitted from the laser diode.

The setpoint voltage can be adjusted either by using the onboard SET trimpot, by applying an external

setpoint voltage, or by summing an external setpoint voltage with the setpoint dialed in using the SET

trimpot. The sum of the external setpoint voltage and the value dialed in using the SET trimpot can be

adjusted from 0 to 2.5 Volts.

To use only the onboard SET trimpot, place the VSET SOURCE jumper on the bottom of the WLD3393

evaluation board in the “T” position, and do not connect an external voltage source to the SET terminal

on the terminal block. The SET trimpot will allow the setpoint be be adjusted from 0V to 2.5V. Figure 6

shows the jumper location.

To use an external voltage source summed with the setpoint voltage from the on board SET trimpot,

place the VSET SOURCE jumper on the bottom of the WLD3393 to the “T” position. Connect an

external voltage source to the SET terminal on the terminal block on the top of the WLD3393 evaluation

board. The resulting setpoint voltage will be the sum of the voltage dialed in using the SET trimpot,

and the voltage applied to the SET terminal. Figure 6 shows the jumper location.

To use an external voltage source only for the setpoint, place the VSET SOURCE jumper on the bottom

of the WLD3393 board to the “X” position and connect the external setpoint voltage source to the

SET terminal on the terminal block on the top side of the WLD3393 evaluation board. When the SET

SOURCE jumper is in the “X” position, the voltage dialed in using the SET trimpot on the WLD3393 is

ignored. Figure 6 shows the jumper location.

In case an external voltage source is not availabe, but setpoint adjustment needs to be external,

a remotely located potentiometer can easily be connected to the WLD3393 to adjust the setpoint.

To used a remote potentiometer, connect the CW lead of the potentiometer to the terminal position

marked 2.5 on the terminal block on the top of the WLD3393 board. Connect the CCW lead of the

potentiometer to the COM terminal and connect the wiper to the SET terminal and ensure that the

VSET SOURCE jumper on the bottom of the board is set to the X position.

CONFIGURING THE DEMO BOARD

200 mA Range 2.0 Amp Range

LDI = V SET * 100 [ mA ] LDI = V SET [ AMPS ]

Table 5: Relate VSET voltage to Laser Diode Current

200 µA Range 2 mA Range

PDI = V PMON * 100 [ µA] PDI = V PMON [ mA ]

Table 6: Relate VSET voltage to Photodiode Current

WLD3393

PAGE 10

WLD3393-00400-A Rev F

A/B TYPE

SET

WLD3343

P MON

I MON

COM

PGND

VDD

PDC

PDA

LDC

LDA

WAVELENGTH

WLD3393

ELECTRONICS

ONLY

(-)

(+)

FAN

PMON

SET

2.5

PDM

COM

LIM

WITH

ENABLE

IMON OFF

USE

E1.08

1.16

0.48 0.68

0.19

0.65

1.60

2.07

2.25

0.19

0.65

1.60

2.07

2.25

0.41

TOP VIEW (inches)

RIGHT SIDE VIEW

MECHANICAL SPECIFICATIONS

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