PICOLAS LDP-C 120-40 NG User manual

User Manual
-preliminary-
LDP-C/CW 120-40 NG
LDP
-
C/CW 80
-
40
NG
PicoLAS GmbH
Burgstrasse 2
52146 Würselen
Phone: [phone]
Fax: [phone]
E-Mail: [email protected]
Web:
www.picolas.de

Rev. 01/2021
1
Table of Contents
Product Family Overview and Parameters.................................................................................................................. 2
Please pay attention to all safety warnings! ............................................................................................................... 3
How to use the Manual ....................................................................................................................................................... 4
How to get started (refer to drawings on next 2 pages) ......................................................................................... 5
Connecting and Interfacing ............................................................................................................................................... 6
Interface Specifications ..................................................................................................................................................... 8
Settings and Readings ...................................................................................................................................................... 10
Functional Description ...................................................................................................................................................... 11
Dos and Don’ts .....................................................................................................................................................................13
Test Load .............................................................................................................................................................................. 14
Power Supply ...................................................................................................................................................................... 14
Cooling ................................................................................................................................................................................... 14
Overtemperature Shutdown ........................................................................................................................................... 15
Soft Start ............................................................................................................................................................................... 15
LED Blink Codes .................................................................................................................................................................. 16
Trigger Modes ...................................................................................................................................................................... 17
Mechanical Dimensions ................................................................................................................................................... 18
Power on Self Test ............................................................................................................................................................ 18
Controlling the Driver using a PLB-21 ........................................................................................................................ 20
Menu Structure ................................................................................................................................................................... 20
Pulse Parameters ............................................................................................................................................................... 21
Trigger .................................................................................................................................................................................... 21
Config ...................................................................................................................................................................................... 21
Defaults ................................................................................................................................................................................. 22
Temperature ........................................................................................................................................................................ 22
Measurement ...................................................................................................................................................................... 22
If an Error Occurs .............................................................................................................................................................. 23
Controlling the Driver via PC ......................................................................................................................................... 24
Introduction .......................................................................................................................................................................... 24
Available protocols ............................................................................................................................................................ 24
Description of the RS232 Interface .............................................................................................................................. 24
Description of the Ethernet Interface .......................................................................................................................... 25
The Serial Text Interface .................................................................................................................................................. 26
Structure ............................................................................................................................................................................... 26
Commands for the LDP-C / CW..................................................................................................................................... 27
The PicoLAS Protocol ....................................................................................................................................................... 30
Structure ............................................................................................................................................................................... 30
General Commands ............................................................................................................................................................31
Commands for the Driver ................................................................................................................................................ 32
Register Description ......................................................................................................................................................... 35
Description of the LSTAT Register ............................................................................................................................... 35
Description of the ERROR Register .............................................................................................................................. 37
Impressum ............................................................................................................................................................................ 39

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Product Family Overview and Parameters
LDP-C/CW 120-40 LDP-C/CW 80-40
Load Current
Range
10 .. 120 A 10 .. 80 A
Compliance
Voltage
40 V 40 V
Max. Output
Power
4800 W 3200 W
Ripple < 1 A < 1 A
Current
Overshoot
< 1% < 1%
Analog
Modulation
(60 A peak-
peak)
< 4 kHz * < 4 kHz *
Current Setting
Time
(0 .. 100%)
< 100 µs < 100 µs
Current Setpoint
(external)
0 .. 2.4 V (50 A/V) 0 .. 2.0 V (50 A/V)
LD Current
sensing
50 A/V ** 50 A/V **
LD Voltage
sensing
0.1 V/V ** 0.1 V/V **
Inputs LDP-C BOB, PLB-21 LDP-C BOB, PLB-21
Supply 24 .. 48 V,
min. 2 V above LD voltage
24 .. 48 V
min. 2 V above LD voltage
Max. Power
Dissipation
@ 120 A / 12 V
out
175 W abs. max. 175 W abs. max.
Dimensions in
mm
100 x 180 x 74 100 x 180 x 74
Weight 1510 g 1510 g
Operating
Temperature
0 .. +55 °C, non condensing 0 .. +55 °C, non condensing

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Please pay attention to all safety warnings!
Change Notes
Rev 01/2021:
- Initial release
Valuable information, remark
Do not
Please pay special attention
Risk of electrical hazard

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4
How to use the Manual
Remark: The LDP-C/CW described in this manual are baseplate cooled devices.
Improper cooling may cause an internal overtemperature shutdown. The two fans in one side
of the unit prevent local thermal hot spots inside the unit. They can not compensate a
baseplate cooling. The air inside an enclosure within an OEM application is usually enough to
yield enough air flow.
Baseplate cooling: Depending on the final application and operation regime, this unit may
stay non-cooled or must be assembled onto a heat sink.
No general rule value can be given. It depends on the (electrical) power used by your diode –
and thus the power dissipation (about 5% of this) in the driver.
You may use a passively or an actively air/water cooled device.
Housing: All units are delivered with housing. Changes are possible the units can be delivered
without housing upon request.
Before powering on your unit, read this manual thoroughly and make sure your understood
everything.
Please pay attention to all safety warnings.
If you have any doubt or suggestion, please do not hesitate to contact us!

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How to get started (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 The following connectors refer always to
the BOB connector (vertical PWB).
Set pin 8 (master enable) to high
(+ 5 V). In order to do this, you
may connect pin 8 to pin 2 (+5 V).
This master enable feature is used
for the safety shutdown of the
laser.
4 If you do not use your driver as a stand
alone module, please connect it to the
PLB or PC.
Use the Ethernet or the PLB-21
connector.
5 Set pin 7 (enable/disable driver) to low
(0 V)
For start up this input must be
low.
6 Connect the input power supply. Make
sure that polarity is correct. The supply
voltage must be at least 12 V and about 4
V above your diode’s compliance voltage.
If the red LED (on the upper right of the
vertical board – see next side) flashes 4
times, it indicates that the supply voltage
is too low.
Make sure that your power
supply does not have any
voltage overshoots when switching
on or off. Do not exceed the
maximum permitted voltage of
48V
7 Set the required current.
If you use the plain driver, apply a voltage
to pin 10 (input analog).
If you use a PLB or a PC, set the current
via the corresponding commands.
The conversion scale is 50 A/V. So
in order to set a current of 25 A,
you would apply a voltage of
0.5 V.
8 Set pin 7 (enable driver) to high. This starts the driver operation.
9 If you use a pulsed trigger mode (default),
apply your trigger pulses to input pin 6.
Input impedance is 10 kΩ
For pulse parameters see
corresponding datasheets.
10 Monitor the output current with an
oscilloscope on pin 9 or the compliance
voltage on pin 4.
Use pin 3 or pin 5 for ground.
Scales:
50 A/V for current (pin 9)
0.1 V/V for voltage (pin 4)
11 Verify that pin 1 is on 0 V. No internal error, unit works fine.

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Connecting and Interfacing
The baseplate is internally not connected to GND to avoid GND loop currents.
The chassis / baseplate must be grounded by the user!
The maximum voltage between GND and chassis is 48 V. Exceeding this
voltage will damage the driver and / or will cause communication errors.
This is not covered by warranty!
Strictly avoid ground loop currents through the controlling interface!
Front view
Serial sticker
Indicating product type,
hardware version (HW)
and software version (SW)
Indicating LEDs
Positive supply
voltage
GND
(supply return)
Ethernet
interface Analog interface
Connect e.g.
BOB here!

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Rear view
Digital interface for PLB-21
(RS-232)
LD +
(Anode)
LD –
(Cathode)
LD anode and cathode must be floated and must have no contact to GND!
The drawing shows all connections which are available to the user.
LDP-C BOB
Connector
See section “Interface Specifications” for detailed information. (Breakout
board connector.)
PLB Connector for PLB-21 human interface device (protected against polarity
reversal).
Vin Supply voltage must be about 4 V above laser diode compliance voltage but
at least +12 V. Do not exceed the limits listed in the datasheets. (24 V and
48 V respectively).
GND Supply ground
LD+ Positive laser diode output (anode). It is highly recommended to use both
connectors parallel, especially for high currents.
LD- Negative laser diode output (cathode). Do not connect to ground. It is highly

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recommended to use both connectors parallel, especially for high currents.
Ethernet Ethernet connector for linking the driver to a network.
For a more convenient use of the driver (e.g. in laboratory use) we recommend the optional
available product accessories LDP-C BOB or the PLB-21. Please see LDP-C BOB and
PLB-21 manual for further details.
Interface Specifications
The following figure shows the input and output signals of the external analog BOB
connector. This connector can be found on the perpendicular circuit board on the right side as
shown on the previous page.
The BOB (Breakout board) is recommended for easy testing of the driver. It will be replaced
in the application by your machine interface. The PLB-21 is a human interface device that
allows for full control of all relevant device parameters.
Functional Description of the analog Connector Interface
The PLB-21 interface is a standard RS-232 interface connection. It can be used to connect
either the PLB-21 or a PC to the driver.

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