PICOLAS LDP-QCW 300-12 User manual

User
UserUser
User Manual
Manual Manual
Manual Rev.
Rev. Rev.
Rev. 1
11
12
22
2.0
.0.0
.06
66
6
LDP
LDPLDP
LDP-
--
-Q
QQ
QC
CC
CW
WW
W 300
300 300
300-
--
-1
11
12
22
2
Your distributor:

2
Table of Contents
LDP-QCW 300-12....................................................................................................................... 1
Table of Contents ....................................................................................................................... 2
How to use the Manual .............................................................................................................. 3
How to get started refer to drawings on next 2 pages) .............................................................. 4
Description of available Connectors ............................................................................................ 5
Interface Specifications ............................................................................................................... 6
Dos and Don’ts........................................................................................................................... 8
Functional Description ................................................................................................................ 9
Trigger modes........................................................................................................................... 10
Regulator.................................................................................................................................. 13
LED codes ................................................................................................................................. 14
Power Supply............................................................................................................................ 15
Cooling..................................................................................................................................... 15
Test Load .................................................................................................................................. 15
Over Temperature Shutdown.................................................................................................... 16
Absolute Maximum Ratings ...................................................................................................... 16
Mechanical Dimensions ............................................................................................................ 17
Controlling the LDP-QCW using a PLB-21 ................................................................................. 18
Controlling the LDP-QCW via USB ............................................................................................ 22
The PicoLAS Protocol ................................................................................................................ 29

3
How to use the Manual
Remark
RemarkRemark
Remark: The LDP
: The LDP: The LDP
: The LDP-
--
-QCW described in this manual is a base
QCW described in this manual is a baseQCW described in this manual is a base
QCW described in this manual is a base-
--
-plate cooled laser diode
plate cooled laser diode plate cooled laser diode
plate cooled laser diode
driver. Improper cooling may cause an internal over temperature shu
driver. Improper cooling may cause an internal over temperature shudriver. Improper cooling may cause an internal over temperature shu
driver. Improper cooling may cause an internal over temperature shutdown. The two
tdown. The two tdown. The two
tdown. The two
fans in one side of the unit have to prevent local thermal hot spots inside the unit. They
fans in one side of the unit have to prevent local thermal hot spots inside the unit. They fans in one side of the unit have to prevent local thermal hot spots inside the unit. They
fans in one side of the unit have to prevent local thermal hot spots inside the unit. They
can not compensate improper base plate cooling. The air inside an enclosure within an
can not compensate improper base plate cooling. The air inside an enclosure within an can not compensate improper base plate cooling. The air inside an enclosure within an
can not compensate improper base plate cooling. The air inside an enclosure within an
OEM application is usually enough to yield enough air flow. Plea
OEM application is usually enough to yield enough air flow. PleaOEM application is usually enough to yield enough air flow. Plea
OEM application is usually enough to yield enough air flow. Please
se se
se do not cover any
do not cover any do not cover any
do not cover any
ventilation slots.
ventilation slots.ventilation slots.
ventilation slots.
Base plate cooling
Base plate coolingBase plate cooling
Base plate cooling: Depending on the final application and operation regime, this unit
: Depending on the final application and operation regime, this unit : Depending on the final application and operation regime, this unit
: Depending on the final application and operation regime, this unit
may stay none
may stay nonemay stay none
may stay none-
--
-cooled or must be assembled onto a heat sink.
cooled or must be assembled onto a heat sink. cooled or must be assembled onto a heat sink.
cooled or must be assembled onto a heat sink.
Please refer to chapter Power dissipation for more details about the
Please refer to chapter Power dissipation for more details about the Please refer to chapter Power dissipation for more details about the
Please refer to chapter Power dissipation for more details about the thermal power
thermal power thermal power
thermal power
losses during operation.
losses during operation.losses during operation.
losses during operation.
You me use a passively or an actively air/water cooled device.
You me use a passively or an actively air/water cooled device. You me use a passively or an actively air/water cooled device.
You me use a passively or an actively air/water cooled device.
Housing: All units are delivered with housing. Changes are possible; the units can be
Housing: All units are delivered with housing. Changes are possible; the units can be Housing: All units are delivered with housing. Changes are possible; the units can be
Housing: All units are delivered with housing. Changes are possible; the units can be
delivered without housing upon request.
delivered without housing upon request. delivered without housing upon request.
delivered without housing upon request.
Before powering on your u
Before powering on your uBefore powering on your u
Before powering on your unit, read this manual thoroughly and make sure your
nit, read this manual thoroughly and make sure your nit, read this manual thoroughly and make sure your
nit, read this manual thoroughly and make sure your
understood it fully.
understood it fully. understood it fully.
understood it fully.
Please pay attention to all safety warnings.
Please pay attention to all safety warnings.Please pay attention to all safety warnings.
Please pay attention to all safety warnings.
If you have any doubt or suggestion, please do not hesitate to contact us!
If you have any doubt or suggestion, please do not hesitate to contact us!If you have any doubt or suggestion, please do not hesitate to contact us!
If you have any doubt or suggestion, please do not hesitate to contact us!

4
How to get started refer to drawings on next 2 pages)
refer to drawings on next 2 pages) refer to drawings on next 2 pages)
refer to drawings on next 2 pages)
Step # What to do Check
1 Unpack your device and place it in front of you
as shown on the next page.
2 Connect a load for example your laser diode)
to the output. Make sure to use both anode
and cathode connectors in
parallel.
3 Connect the PLB-21 or the USB cable A driver is required in order to use the
LDP-QCW with a PC. See chapter
“Controlling the LDP-QCW via USB”
for more information
4 Connect the input power supply; make sure
that polarity is correct. The supply voltage must
be at least 24 V and about 5 V above the
desired capacitor bank voltage.
Make sure that your power
supply does not have any
voltage overshoots when
switching on or off. Do not exceed the
maximum operating voltage of 48 V
5 Switch the power supply on
6 If a PLB-21 is used, its display may show a
message about downloading a new driver.
Confirm this with YES.
See chapter “Controlling the LDP-QCW
using a PLB-21” for more information
7 Set all required parameters using the PLB-21 or
USB interface See chapter “Controlling the LDP-QCW
using a PLB-21” for more information
8 Apply +5V to the MasterEnable pin of the BOB
connector See chapter “Interface specifications”
for more information
9 Apply +5V to the Enable pin of the BOB
connector. This will enable the output See chapter “Interface specifications”
for more information
10 Monitor the current pulses using an
oscilloscope connected to the current monitor
output
See chapter “Interface specifications”
for more information
11 Verify that the PULSER_OK signal is +5V See chapter “Interface specifications”
for more information

5
Description of available Connectors
The following drawing shows all connections which are available to the user.
PLB
Mini USB type B
GND
V
in
LD+
LD-
LD+
LD-
BOB
connector (edgewise)
LDP- BOB
onnector
See section interface specifications for detailed information. Break-out-board
connector.)
PLB Connector for PLB-21 protected against polarity reversal)
V
in
Supply voltage
GND Supply ground
LD+ Positive laser diode output anode). Use both connectors parallel for high
currents.
LD- Negative laser diode output cathode). Do not connect to ground! Use both
connectors parallel for high currents.
Mini USB Mini USB connector for connecting the driver with a computer.
For a more convenient use of the driver e.g. in laboratory use) we recommend the optional available
product accessory LDP-C-BOB. Please see LDP-C-BOB manual for further details.

6
Interface Specifications
The following figure shows the input and output signals of the external analogue BOB connector.
The BOB Break-out Board) is recommended for easy testing of the driver. It will be replaced in the
application by your machine interface.
Functional Description of BOB-Connector Interface

7
Pin Description numerical assorted)
Pin1: Pulser OK
Pin1: Pulser OKPin1: Pulser OK
Pin1: Pulser OK
The state of this Signal indicates weather the driver is ready 5V) or it has an error pending 0V).
Pin 2: 5V
Pin 2: 5VPin 2: 5V
Pin 2: 5V
This pin provides 5 Volts for external usage. Please note that the load should not exceed 10mA, otherwise
the voltage will drop.
Pin 3: GND
Pin 3: GNDPin 3: GND
Pin 3: GND
This pin is connected to ground.
Pin 4: U
Pin 4: UPin 4: U
Pin 4: U
diode
diodediode
diode
This signal provides near real-time measurement of the laser diodes compliance voltage. The scaling is 10
volts per volt measured into 1MOhm.
Pin 5: GND
Pin 5: GNDPin 5: GND
Pin 5: GND
This pin is connected to ground.
Pin 6: Pulse
Pin 6: PulsePin 6: Pulse
Pin 6: Pulse
This signal is used in the external end external controlled trigger mode. Connect your external trigger
source to this pin. The signal amplitude should be within 3 to 6Volts.
Pin 7: Enable
Pin 7: EnablePin 7: Enable
Pin 7: Enable
This signal is used to enable / disable the current output of the driver during operation.
It must be pulled low to reset an error condition or to re-enable the driver after Master Enable was pulled
low.
Pin 8: Master Enable
Pin 8: Master EnablePin 8: Master Enable
Pin 8: Master Enable
This signal is used as an interlock safety feature that disables the complete driver if set to 0V during
operation. In order to re-enable the driver after this emergency shutdown the enable signal must first set
to 0V.
If this feature is not required this pin can be connected to Pin 2 5V).
Pin 9: I
Pin 9: IPin 9: I
Pin 9: I
diode
diodediode
diode
This signal provides near real-time measurement of the laser diodes current flow. The scaling is 200
amperes per volt measured into 1MOhm.
Pin 10: I
Pin 10: IPin 10: I
Pin 10: I
setpoint
setpointsetpoint
setpoint
This signal is used to provide an external current set point. The voltage at this pin is periodically sampled
by the driver if it is configured to use the external set point current

8
Dos and Don’ts
Never
NeverNever
Never ground any output connector.
Never
NeverNever
Never use any grounded probes at the output.
Do not
Do notDo not
Do not connect your oscilloscope to the output!
This will immediately destroy the driver and the probe!
For measuring current and voltage you connect the scope to Pin 9 or Pin 4 of the BOB connector
respectively.
Keep connecting cables between power supply and driver as well as the connection between driver
and laser diode as short as possible.
Mount the driver on an appropriate heat sink!
Mount the driver on an appropriate heat sink!Mount the driver on an appropriate heat sink!
Mount the driver on an appropriate heat sink!
Please
Please Please
Please be aware that there might be hot surfaces, be careful not to touch them!
be aware that there might be hot surfaces, be careful not to touch them!be aware that there might be hot surfaces, be careful not to touch them!
be aware that there might be hot surfaces, be careful not to touch them!
Do never connect the oscilloscope to the output connectors!!!!
Please Note: above picture shows another but similar PicoLAS driver)

9
Functional Description
The driver uses a DC-DC converter to load a capacitor bank to a defined voltage. A PI regulator uses
T
1
and a shunt to control the current flow through the laser diode.
Laser diode current and compliance voltage are pre-processed and fed to the external BOB-connector.
Several security features protect the laser diode and driver from damage. D
1
protects the laser diode
from reverse currents. The switch S
1
is automatically opened when an over current as well as an
internal failure such as over temperature, etc.) is detected.
Operation Principle of LDP-QCW driver
Element Function
1 Input Buffer Capacitor
b Capacitor bank
S1 Security Switch
D1 Laser diode protection diode
T1 Current regulation MosFET
Shunt LD-current monitor

10
Trigger modes
The LDP-QCW supports tree different trigger modes as explained below
Internal
InternalInternal
Internal
The pulse generation is performed by an internal pulse generator. The pulse width and repetition
rate is user configurable via the PLB-21 or the serial interface.
In addition, the number of pulses to be generated can be configured. To use this feature the
wie soll das gehen?
user has to set the TRG_COUNT bit in the LSTAT register to “1”. The current output is automatically
disabled after an internal counter reaches the configured value. The counter is reset by setting the
L_ON bit of the LSTAT register to “0” or by setting the ENABLE pin to 0V.
Please note that the maximum pulse width depends on the current repetition rate as well as the
maximum repetition rate on the current pulse width.
The following diagram shows an example of generated pulses. The lower graph shows the internal
pulse generator, the upper two graphs the trigger pulses generated out of it.
meaning
T
1
enabling of the output
T
1
-T
2
The delay between output enable and the first generated pulse depends on the
configured repetition rate. It nearly equals the pulse pause time.
T
2
-T
3
Pulse rise time. It depends on the load inductance.
T
4
-T
5
Pulse fall time. It depends on the load inductance.
T
6
disabling of the output
T
7
re-enabling of the output