Meerstetter Engineering LDD-1125 Manuale utente

User Manual

Laser Diode Driver

LDD-Family:

LDD-1124

LDD-1121

LDD-1125

Meerstetter Engineering GmbH

Schulhausgasse 12

3113 Rubigen, Switzerland

Phone: +41 31 712 01 01

Email: contac[email protected]h

Website: www.meerstetter.ch

Meerstetter Engineering GmbH (ME) reserves the right to make changes without further notice to the product described herein. Information

furnished by ME is believed to be accurate and reliable. However typical parameters can vary depending on the application and actual performance

may vary over time. All operating parameters must be validated by the customer under actual application conditions.

SWISS MADE

User Manual

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Driver

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Table of Content

Overview LDD-1121-based Laser Diode Drivers 4

Introduction to the LDD-Family of Laser Diode Drivers 5

Getting Started, Step-by-Step 6

3.1

Software Installation 6

3.2

Mounting and Powering-Up the Laser Diode Driver 7

3.3

Hardware and Status Verification 7

3.4

Laser Diode and Driver Monitoring 8

3.5

Configuration Tab 'Settings', Entering New Parameters 8

3.6

Operation Control, Driving a Load in CW Operation 9

3.7

CW Modulation by Internal Generator 9

3.8

Continuous Current Regulation (PID), Output Enabling via USB 10

3.9

Pulse Generation by Internal Generator 10

LDD Signal Generation and Control Operating Principle 11

LDD Service Software Reference 12

5.1

Laser Diode Driver Configuration via LDD Service Software 12

Configurations and Parameter Activation 12

Importing and Exporting .ini Configuration Files 12

Settings Dump (*.mepar File) 13

5.2

Tab1: Monitor 14

5.3

Tab2: Operation Control 16

Modulated CW Current (Current-Stage) 17

Current Pulses: Chopped CW (Pulse-Stage) 17

Laser Diode Driver Output Enable 17

5.4

Tab3: Laser Power Control – LPC [NOT ON ALL MODELS] 18

Step-by-Step Instructions / Check-List Laser Power Control 19

Laser Power Control Soft-Start 19

5.5

Tab4: Chart 20

5.6

Tab5: Settings 21

PID Current Regulation 22

Analog Current Control and Limits 22

Trigger Output 22

Remote Control / Bus Control by Communication Protocol 'MeCom' 23

Service Communication 23

Laser Diode Temperature Monitoring 24

5.7

Tab6: Maintenance 25

Remote Control / Service Communication by LDD Service Software 26

LDD-Family Laser Diode Driver Firmware Updates 29

5.8

Tab7: Expert 30

Laser Diode Temperature Measurement Settings (Temperature Acquisition System) 30

Current Measurement Settings (Current Acquisition System) 31

Laser Power Measurement Settings (Light Power Acquisition System) 31

Appendix 1

Laser Diode Driver Status LEDs and Error Codes 32

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1 Overview LDD-1121-based Laser Diode Drivers

Figure 1. Schematic top view of an LDD-1121-based laser diode driver. Elements

relevant to the end-user are highlighted.

The Platform Bus (X3) allows connection to a TEC-1122-based TEC controller.

Power supply, laser diode, temperature sensor and photo diode not included.

4-POL Connector,

Back View (Cable

Insertion Voids)

(0,0)

Laser

Diode

Power

Supply

Mounting (M3-size Bores, 7.5mm in Length):

M1: x = 4.0 mm, y = 86.0 mm

M2: x = 98.0 mm, y = 86.0 mm

M3: x = 4.0 mm, y = 4.0 mm

M4: x = 98.0 mm, y = 4.0 mm

Power Terminals: M4-size Screws

Pin Descriptions Platform Bus X3:

1: GND for TYCO Plug 14-POL

2: RES1 8-215083-4

3: RES2

4: RES3 (Analog Input)

5: RES4

6: RES5 (PULSE Trigger Output)

7: RES6

8: RES7 (PULSE Trigger Input)

9: RES8 (ENABLE)

10: GND

11: RS485_A1 [120Ω Termination, DIP-Switch J1, 1]

12: RS485_B1

13: RS485_A2 [120ΩTermination, DIP-Switch J1, 2]

14: RS485_B2

Dimensions (L x W x H): 120 x 90 x 18 mm3

LDD Board

NTC, LD Temperature

Photo Diode

for TYCO 4-POL

Plug Housing

794617-4

with AWG 20

-24

Crimp Contacts

794610-1

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2 Introduction to the LDD-Family of Laser Diode Drivers

This manual is written for products that are part of the LDD-Family of advanced laser diode

drivers/controllers, based on the LDD-1121.

LDD-Family devices have two operation modes, continuous and pulsed. In continuous (CW) mode, the

low-ripple current output can be modulated up to intermediate frequencies. In pulsed mode, high-

frequency pulses with steep edges can be generated by CW chopping.

Individual laser diode drivers can be remotely-controlled (RS485/USB, HW lines), or they can operate as

stand-alone units, controlled by internal generators. These internal generators are again remotely-

configurable.

LDD-1121-based laser diode drivers are controlled by powerful microcontroller (STM32), fast signal paths

and critical safety features are implemented in hardware (FPGA).

Figure 2. Functional Diagram of an LDD and its periphery.

Laser diode temperature monitoring (using NTC sensors) and thermal shut-down comes as standard.

Optionally, laser diode drivers can be equipped with light measurement hardware (to be used in

conjunction with a photodiode) which will allow laser power monitoring or laser power closed-loop control,

depending on the firmware.

The LDD-Family has been developed to work along the dual channel members of the TEC-Family of

advanced TEC controllers/drivers that share the same platform bus, communication protocol and

hardware architecture. See Table A for an overview over the current LDD- and TEC-Families.

Model Description

LDD-Family LDD-1124 0-1.5 A / 0-15 V, Low-Ripple CW and Pulsed-Mode Operation

Laser Diode Drivers LDD-1121 0-15 A / 0-15 V, Low-Ripple CW and Pulsed-Mode Operation

LDD-1125 0-30 A / 0-15 V, Low-Ripple CW and Pulsed-Mode Operation

TEC-Family TEC-1089 ±10 A / ±19 V, Compact, Single Channel

Peltier Drivers TEC-1090 ±16 A / ±19 V, Compact, Single Channel

TEC-1122 2x (±10 A / ±19 V), Dual Channel

TEC-1123 2x (±16 A / ±19 V), Dual Channel

Table A. Overview over the Meerstetter LDD- and TEC-Families of advanced controllers.

Meerstetter Engineering GmbH is specialized in supporting custom laser solutions.

The present manual covers LDD-Family Firmware and Service Software version 1.50.

GND / -3.3V / -10V

Buck Converter

3-Phase

FPGA

STM32

Light

USB

RS485

Enable

Pulse

Vin

GND

12-24V

GND

LDD-112x

Current

Voltage

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3 Getting Started, Step-by-Step

In the following steps, setting up an LDD-Family laser diode driver for basic operation is described. Bullet

points (•) designate actions, tick boxes () feedbacks/reactions, and arrows (



) further information.

3.1 Software Installation

Step 1 Install USB Driver

• Start up a PC running Windows XP or Windows 7

• Use a Mini-USB cable to connect the laser diode driver to the Service PC

Windows recognizes the USB interface and installs a (Serial Interface) driver

In case Windows cannot locate the FTDI USB driver by itself, get it from the Meerstetter LDD and TEC products

CD or download the executable 2.08.24 (or newer) from: http://www.ftdichip.com/Drivers/CDM/CDM20824_Setup.exe

This installation does not require the LDD to be powered, yet (the isolated USB interface is bus-powered)

Step 2 Install LDD Service Software

• Please ensure the Service PC meets the following requirements:

o .net Framework 4.0

(.net Web Installer* dotNetFx40_Full_setup.exe and Windows Update)

o Microsoft Visual C++ 2010 [SP1 or above] Redistributable Package**

o Display resolution: 1024x768 or greater

• Copy the latest version of the Service Software executable

(e.g. LDD Service [version].exe) to the Service PC and launch it

All required software and drivers are located on the Meerstetter laser diode driver (LDD-Family) and TEC controller

(TEC-Family) products and support CD [me5145]

*Online/web installer for .net Framework 4.0: http://www.microsoft.com/download/en/details.aspx?id=17851

followed by patching via www.windowsupdate.com (several files) and restart

**32bit version vcredist_x86.exe: http://www.microsoft.com/download/en/details.aspx?id=8328

On 64bit versions of Windows 7, the additional installation of vcredist_x64.exe may be necessary:

http://www.microsoft.com/download/en/details.aspx?id=13523

The present LDD Service Software is a tool that has been programmed by Meerstetter Engineering for internal use,

namely for device configuration, monitoring, and debugging during product development. It is being made available

to customers for OEM device evaluation, commissioning and integration

LDD Service Software displays 'Device connected, establishing communication…' in the

bottom left corner and the red indicator confirms 'Communication error with Device'

Screenshot: USB connected,

laser diode driver unpowered

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3.2 Mounting and Powering-Up the Laser Diode Driver

Step 3 Mount LDD onto System Carrier Plate

• Locate the four mounting holes M1-M4 (see Figure 1)

• Use M3 size screws to fasten the laser diode driver to the system

For initial tests / operation at low power, placing the LDD on a metal plate / heat sink should be sufficient

Step 4 Connect Laser Diode Driver to Power Supply

• Connect X1 (VIN) and X2 (GND) to the outputs of the external power supply

Do not connect the laser diode, yet

Step 5 Power up Laser Diode Driver

• Enable power supply and check device status

Either the green or the red STM32 Status-LED (see Figure 1) should be blinking / lit. The

status of the blue LED can be ignored

Either the green or the red FPGA Status-LED should be blinking / lit

Step 6 Successful Connection

• Check active connection between laser diode driver and LDD Service Software

The square in the bottom left corner of the LDD Service Software should be green and

'Connected'

The 'Device Status' indicator should be amber and 'Ready'

A color-coded indicator informs about the current device status, refer to Appendix 1 for more information

3.3 Hardware and Status Verification

Step 7 Identify 'Software and Hardware Versions'

• Locate the corresponding group box in the 'Monitor' tab (Tab1)

Take note of the firmware, FPGA and hardware versions

Check the serial number matches the sticker on your laser diode driver

Step 8 Check 'Power Supplies'

• Locate the corresponding group box in Tab1

Check the input voltage matches the one of the external power supply

Check the internal 10V, 3.3V and 1.2V supplies are working at nominal voltage

Step 9 Check 'Error Status'

• Locate the corresponding group box in Tab1

Take note of the three error indicators. 0s are shown when no error is present

If applicable, a brief Error Description is displayed in the corresponding field. Please consult the reference section

for more information on LDD-Family laser diode driver and on TEC-Family TEC controller error conditions

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3.4 Laser Diode and Driver Monitoring

Step 10

Check 'Laser Diode Values' with no Laser Diode or Temperature Probe Connected

• Locate the corresponding group box in Tab1

Note that current and voltage values are static and close to zero

(no LD connected, LDD disabled)

Note that laser diode temperature is at end of range

(no °T probe connected, default thresholds are

set such that no diode temperature error is generated)

The above monitoring values will be revisited once the LDD is driving a load and temperature acquisition is set up

Step 11

Check 'Driver Values' with no Laser Diode Connected / Driver Disabled

• Locate the corresponding group box in Tab1

Note that there are three buck converter channels / phases and that their current is

balanced

(currently near nil)

Take note of the laser diode driver's base plate temperature

The LDD is driven by three buck converters at 120°phase shift. The FPGA takes care of channel balancing

3.5 Configuration Tab 'Settings', Entering New Parameters

Step 12

Move from the 'Monitor' Tab to a Configuration Tab, Check System Settings

• Switch to Tab5 'Settings'

• Locate the 'Current PID Regulation Parameters' group box

Please check the PID parameters are set

according to the illustration to the right

Current regulation by PID is covered in the reference section

Tab5 is a configuration tab (not a monitoring tab, such as

Tab1). In configuration tabs, each parameter displays an actual

value next to a blank field for entering a new value

New values need to be transferred to the device by clicking

'Write Config' in the bottom right corner of the Service Software.

See chapter 5.1 for more information about parameter transfer

Step 13

Check 'Maximum Values' (Limits)

• Locate the corresponding group boxes in Tab5

Please take the time adjust factory settings to

your requirements

Current limits define the permitted range of user-settable

nominal values. Chose values limiting the range you intend to

employ

'Max Current Error' is an important safety setting that limits the

LDD's power output to protect the connected diode. Reaching this

threshold triggers ultrafast (<4 µs) switchoff! Always set this value

below or at the absolute maximum current rating of the used laser

diode (please refer to the manufacturer's data sheet)

Again: Transfer new values the laser diode driver by clicking

'Write Config'

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3.6 Operation Control, Driving a Load in CW Operation

Step 14

Make Sure Laser Diode Driver is in CW Mode and DISABLED

• Switch to Tab2 'Operation Control'

• Identify the numerical and graphical sections for current (CW, modulated) and pulse

settings

Make sure 'Current Settings' 'Input Source' is set

to 'CW' and that 'Current CW' is set to a value

supported by the first device (laser diode or dummy

load) to be connected

Make sure 'Input Source' for 'Enable Settings' is

set to 'OFF', else toggle to 'OFF' [+ 'Write Config'

button]

Step 15

Connect and Drive Load (Laser Diode or Dummy Load)

• Connect an adequate load* to sockets X5 (Anode) and X6 (Cathode)

• If you intend to use the LDD's pulsed mode, use low inductivity connection lines and

place the diode / load as close to X5 and X6 as possible

• Toggle 'Enable Settings' 'Input Source' to 'ON' [+ 'Write Config' button]

Switch to Tab1 'Monitor' and observe how 'Laser Diode Current Actual' and 'Laser Diode

Current Pulse' now indicate the set CW current

'Laser Diode Voltage Actual' and 'Laser Diode Voltage Pulse' indicate the resulting voltage

Also, 'Driver Values' (Tab1) should now indicate three balanced buck converter currents,

delivering one third of the total current each

*For early evaluation and training purposes, the use of a dummy load over a laser diode is recommended

Meerstetter Engineering also encourages you to crosscheck the current and voltage through/across the load with

your own instruments. For static CW mode, the use of multimeters is sufficient. For modulated CW and pulsed mode,

adequate current probe and oscilloscope will be necessary. (Note that a bandwidth of DC-10 MHz or above is

required for analyzing pulse edges.)

3.7 CW Modulation by Internal Generator

Step 16

Configure Internal Generator to Control CW Current

• As demonstration for the laser diode driver's current modulation capability, and as a

basis for PID optimization, you want to modulate the current source in a synthetic

waveform as shown in the top of Tab2

• Enter 'High' and 'Low' current values and residence times and define the rising and

falling ramps in-between

• Toggle 'Current Settings' 'Input Source' to 'Int. Generator' [+ 'Write Config' button]

Observe how 'Current Graph' becomes active (not grayed out) and set values are displayed

Switch to Tab1 'Monitor' and observe how 'Laser Diode Values' now fluctuate between the

high and low values for current and voltage

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3.8 Continuous Current Regulation (PID), Output Enabling via USB

Step 17

Optimize PID Regulation

• You want to find PID values that allow the CW current source to follow given nominal

values (internally generated or externally given) as fast and accurately as possible. As

for all regulation problems, system tuning depending on the actuator, the feedback,

the signal and the load will be a trade-off between speed, precision and stability

• For the optimization of PID regulation, external online monitoring (oscilloscope, current

probe) is required. Also, starting with a dummy load connected is highly recommended

The internal generator produces a nominal value that the current source attempts following using PID regulation.

Very conservative ("mild") PID values were factory-set. It is likely that you will not observe a trapezoidal waveform with

these initial settings

Refer to the reference section for information on PID parameters and configuration.

Step 18

Enable Laser Diode Driver from within LDD Service Software

• The best way for enabling and disabling the LDD output is to use a digital "interlock"

signal on the platform bus hardware line 'ENABLE'. To use this feature, please select

'HW Pin9' from the dropdown menu [ + 'Write Config' button]

• During PID optimization or general USB-controlled operation, the most convenient

way for enabling and disabling your LDD is to use the 'Enable ON' button that

becomes available if 'Data Interfaces' is selected from the menu (see illustration

below)

Observe the 'Enable NA' button become live after

selection of 'Data Interfaces' as 'Enable Settings'

input source

This button allows the user to toggle 'Enable' between ON and

OFF without pressing 'Write Config' each time

3.9 Pulse Generation by Internal Generator

Step 19

Configure Internal Generator to Control Pulse Generation

• The laser diode driver can generate pulses with very steep edges by chopping of the

CW current with a binary pulse signal

• For individual / rare pulses, one might use the software button

• As demonstration for the LDD's fast pulse generation capability, you want to chop the

modulated current source by a higher frequency square wave as shown in the bottom

of Tab2

• Enter 'High' and 'Low' residence times

• Toggle 'Pulse Settings' 'Input Source' to 'Int. Generator'

Observe how 'Pulse Graph' becomes active (not grayed out)

Switch to Tab1 'Monitor' and observe how the '…Pulse' parameters in 'Laser Diode Values'

now indicate peak/plateau readings

(This way of signal monitoring is for quick reference only. Please use a

current probe and an oscilloscope to assess signals)

The edge steepnesses of the chopped signal are hardware-given and not influenced by rise times or slope limits

To the CW source, the chopped output represents a different 'load' than the unchopped one. It may therefore be

possible, that PID values need slight re-adjustment when a CW signal is being submitted to chopping

Again, internal generation is ideal for evaluation and stand-alone operation. For integrated application the pulse

source can be remotely controlled by RS485 and USB data interfaces, or by a digital PULSE signal on the hardware

platform bus

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