PICOLAS LASER COMPONENTS BFPS -VRHSP 02 User manual

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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
User Manual
BFPS-VRHSP 02
Laser
Diodes
Germany and Other Countries
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Table of Contents
Please pay Attention to all Safety Warnings!................................................... 2
Product Overview ............................................................................................ 3
How to use the Manual.................................................................................... 4
How to get started ........................................................................................... 5
Dos and Don’ts................................................................................................ 6
Required Laser Diode Pinout .......................................................................... 6
Required electrical Characteristics of the Laser Diode.................................... 7
Operation Principle of the BFPS-VRHSP 02 ................................................... 7
Description of the Connectors of the BFPS-VRHSP 02 ................................ 10
Input (#2) and Current Monitor (#1)............................................................... 11
Propagation Delay (#2 to #1)......................................................................... 11
Power Supply (#3) and Supply absolute maximum Ratings.......................... 11
Description of the RS-232 Connector (#4) .................................................... 12
How to connect the PLB-21 to the RS-232 Connector (#4)........................... 12
Description of the I/O Connector (#5)............................................................ 13
Cooling .......................................................................................................... 14
Test Load ...................................................................................................... 14
TEC Stage..................................................................................................... 14
Laser Fire Monitoring Output (#5-2) .............................................................. 14
Visual Indication (#5-3).................................................................................. 15
Absolute maximum Ratings........................................................................... 15
Mechanical Dimensions ................................................................................ 16
I²C Interface................................................................................................... 18
Controlling the BFPS-VRHSP 02 using a PLB-21 ......................................... 19
Controlling the Driver via a PC ...................................................................... 22
The PicoLAS Protocol ................................................................................... 26
Please pay Attention to all Safety Warnings!
Symbols used in this Manual:
Valuable information, remark
Do not
Please pay special attention
Risk of electrical hazard
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3
04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Laser
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Germany and Other Countries
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Nordic Countries
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
How to use the Manual
Remark: The BFPS-VRHSP 02 described in this manual is a baseplate
cooled laser diode driver. Improper cooling may cause an internal over
temperature shutdown.
Baseplate cooling: Depending on the final application and operation regime, this
unit may stay non-cooled or must be assembled onto a heat sink.
You may use a passively or an actively air/water cooled device.
Before powering on your unit, read this manual thoroughly and make sure your
understood everything.
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
How to get started
The basic settings (temperature, LD current etc.) can be adjusted using the
RS-232 or the PLB-21. You need an additional pulse generator which has to
be connected to the Input MMCX-Terminal. There is no pulse generator
on board of the seed driver!
The PCB is very thin. Mechanical force has to be avoided to prevent
damage. Mechanical damages are not covered by warranty.
Step
What to do
Check
1
Assemble the driver onto an appropriate heat
sink.
2
Solder a dummy diode between pin no. 10
and pin no. 11. Alternatively make a short
circuit there.
Refer to section “Test Load”. The
connection must be as short as
possible.
3
Connect GND, +5 V TEC and +5 V LD on
power connector (power supply disabled).
Required current for this step is
around 1.2 A per channel.
4
Connect PLB-21 via D SUB9 to Micro MaTch
cable or PC interface.
Refer to cable drawings.
5
Connect AWG or pulse generator on input
terminal (no pulse before power supply
enabled).
Refer to all sections referencing
input (connector #2).
6
If a PLB-21 is used, communication must be
possible.
Check the +5 V TEC supply for this
step.
7
Connect the oscilloscope to the driver
(connector #1)
Check if the LD power output is activated in
the settings for the BFPS –VRHSP 02
Enable the power source for +5 V LD.
Set via PLB-21 / hyper terminal program
pulse width = 10 ns (swidth 10000).
Set via hyper terminal program output current
= 50 %, respectively 1 A (scurrent 50).
Feed a triggering signal on the input terminal.
For example 3.3V (50 Ohm termination), 100
ns pulse width and 300 µs repetition rate.
Set output current to an allowable value.
Please consider limiting values of
intended/used laser diode.
Set oscilloscope to a 50 Ohm
termination.
Either by PLB-21 under setpoint 2
(auto) or check with glstat by with
the terminal program (return: “17”)
Make sure not to overload the laser
diode or the driver.
On Imon-Output (current monitor)
you can measure an inverted signal
comparable with the input signal.
Scaling of the I-Mon output is -
14 A/V. An output current of 1 A
conducts an output voltage of 71
mV on current monitor.
8
Disable the input signal and turn the power
sources for +5 V LD and +5 V TEC off. Take
out the test diode or bypass. Assemble the
final laser diode.
9
Turn the power supply for the +5 V TEC on.
If you are using a laser diode with TEC you
can set temperature settings on PLB-21.
Use the menu TEC SetpointTEC
stp.
10
Apply the triggering signal.
Make sure not to overload the laser
diode!
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Dos and Don’ts
Never ground any output connector.
Do not connect your oscilloscope to pin 10 and pin 11! This will
immediately destroy the driver and the probe!
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!
Please be aware that there might be hot surfaces. Be careful not to
touch them!
Required Laser Diode Pinout
The BFPS-VRHSP 02 is designed for the use with laser diodes in a butterfly
package according to the following pin layout:
The driver is connecting pin 9 & 10 and pin 11 & 12 together. Pitch of the
legs: 2.5 mm. Distance of the legs to bottom of the chassis: 4.5 mm.
Please shorten the legs to avoid short circuits inside the driver
The maximum internal stray impedance must not exceed ~ 10 nH to
achieve best performance
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Required electrical Characteristics of the Laser Diode
Parameter
Comment
Min.
Typ.
Max.
Laser diode forward voltage
0 V
1.8 V
2.2V
Back facet monitor reverse
voltage
5 V
15 V
Back facet monitor
responsivity
5 V reverse voltage
0.5
µW/mA
20 µW/mA
(10 µW/mA typ)
Back facet monitor dark
current
5 V reverse (bias)
voltage
40 Na
Thermistor resistance
At 25 ºC
9.5 kΩ
10.5 kΩ
TEC current
Peak current (short
term)
2.0 A
TEC current
Continuous current
0 A
1.0 A
1.5 A
TEC voltage
Depending on type of
laser diode
3 V
Operation Principle of the BFPS-VRHSP 02
Laser driver block diagram
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
The output current follows the input trigger signal within a range of 0 mA .. 2 A and
pulse width 500 ps .. 34 ns. A trigger input voltage of 3.3 V triggers the internal
circuit and generates the adjusted pulse width and output current. Both
parameters can be set via the communication interface. Whereas the current
monitor shows the inverted output current.
In case of an error such as overtemperature or overvoltage of the power supply an
automatic safety function deactivates a power switch and protects the laser diode.
For a normal operation of the current control unit, it is necessary that the unit
applies a bias current on the output. The bias current is in a range of 1 .. 2 mA and
is calibrated by the manufacturer.
An internal HV power source is used to achieve fast current rise times down to
300 ps.
The figure below shows an example of the minimal possible pulse width versus
laser diode current.
Attention: The selected laser diode affects the result of pulse performance.
output current vs pulse width
0
200
400
600
800
1000
1200
1400
1600
1800
2000
400 500 600 700 800 900 1000 1100
pulse width / ps
output current / mA
The typical output current of maximum 2 A is available with duty cycles up to
0.5%.
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
TEC driver block diagram
Laser fire block diagram
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Description of the Connectors of the BFPS-VRHSP 02
Connector
Function
Assembled Type
You need:
#1
Current monitor
(Output)
MMCX, female
MOLEX - 73415-
1001
MMCX, male
(e.g. Farnell
1111325)
#2
Signal input
MMCX, female
MOLEX - 73415-
1001
MMCX male
(e.g. Farnell
1111325)
#3
Power connector
Screw terminals
-
#4
RS-232
MOLEX_908140004
MOLEX - 90327-
0304 (e.g. Farnell
673146)
#5
I/O
Micro-MaTch,
female 8-215460-0
Male on Wire
1-215083-0
(e.g. Farnell
1772972)
#6
Programming adapter. Do not use.
#1 #2 #3 #4 #5 #6
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Input (#2) and Current Monitor (#1)
The driving trigger signal is provided via connector #2. The output current is
following the laser diode current within the limitations (bandwidth, rise time)
proportional (refer to section “Linearity”).
By using of 50 Ohm termination the current monitor has a scaling of -14.0 A/V.
Propagation Delay (#2 to #1)
The typical propagation delay from input to start of current flow is typ. 10 ns.
Power Supply (#3) and Supply absolute maximum
Ratings
The seed driver requires a stabilized +5 V for the µC and TEC and a separated
stabilized +5 V for the laser driver itself.
The µC supply must not shut down before the laser driver supply is down.
The laser driver supply can be interrupted at any time for e.g. safety reasons by
the customer.
If this kind of safety function is not required, both + 5 V may be connected
together.
Pin of conn. #3
Allowed range
Best
performance
Destroying limit
1 (laser supply)
4.75 V .. 5.5 V
+ 5.5 V
+ 6.5 V
2 (GND)
GND
GND
3 (µC & TEC)
4.75 V .. 5.25 V
+ 5.0 V
+ 6 V
1 2 3
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Description of the RS-232 Connector (#4)
Pin Number
Description
Direction
Comments
1 (marked in
red)
+12 V
Output
Only for the use with the PL-B21,
prevent any overload or short! (max.
100 mA)
2
TXD
I/O
RS-232 standard serial interface
3
RXD
I/O
RS-232 standard serial interface
4 (right)
GND
Output
The RS232 interface can be used with a PC and a suitable terminal program or
alternatively with the PLB-21.
How to connect the PLB-21 to the RS-232 Connector (#4)
9
2
3
5
DSUB9
Fe m a le
1
2
3
4
Mic ro
+ 12V
TX D
RXD
GND
M a Tc h
Ae ria l View
To connect the PLB-21 to the seed driver, a cable according the scheme above is
required.
D SUB9 female on cable: Harting 0966118 7500
Micro MaTch on cable: Molex 90327-0304
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Description of the I/O Connector (#5)
10
8
6
9
7
5
3
4
2
1
p rinted c irc uit b oa rd
Pin
BFPS-VRHSP 02
1
GND
2
Laser Fire
3
GND
4
NC
5
GND
6
Over- /
Undertemperature
7
GND
8
NC
9
SCL (I2C)
10
SDA (I2C)
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Cooling
The seed driver is baseplate cooled only. Please assemble the entire unit to a heat
sink which is capable to dissipate the heat.
The heat sink is suitable, if the system temperature does not exceed the maximum
operating limits. To achieve best performance the baseplate temperature should
be kept in the range of +10 °C .. +35 °C. The peak heat load is 15 W.
Test Load
For the first testings a test load may be assembled instead of the laser diode. This
test load may be a short circuit or a fast Schottky diode like ES3C. Please connect
the test load only between anode and cathode (LD+ and LD-) and prevent shorts
to any other part of the circuit.
TEC Stage
The seed driver has got an internal TEC stage to drive typical TECs inside the
butterfly package.
All parameters can be set digitally via I2C, RS-232 or the PLB-21. There is no
analog input or potentiometers for these setpoints on the board.
TECsetpoint adjustment: 0 °C .. +70 °C
TEC temperature accuracy: +/- 0.1 ºC
Switching points at > 1.5 °C from setpoint temperature result a low signal on the
over- / undertemperature output.
If the actual temperature reaches the setpoint temperature the over- /
undertemperature output will be pulled to a high signal.
Laser Fire Monitoring Output (#5-2)
The seed driver is equipped with a laser firing monitor (Terminal #5, pin 2).
The TTL output turns high whenever the current of back facet monitor is above the
triggering threshold.
Output: +5 V TTL (active = HIGH)
Output style: Open collector, internal pull-up 220 R, short circuit current
max. 25 mA.
Threshold setpoint is set digitally via I2C, RS-232 or PLB-21
Output remains high if signal remain above threshold
Short pulses are prolonged to 500 ns (retriggerable monoflop)
A high frequency pulse train (pulse distance shorter than 500 ns) will
appear as a constant high signal at the output.
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Visual Indication (#5-3)
LED 1: Green LED shows a weak glow when the internal power source of
50 V is ready.
LED 2: Green LED lights on when the power supply voltage of +5 V for
TEC and for laser driver are in within valid range.
LED 3: Red LED lights on when the supply voltage is too low.
LED 4: Green LED lights on when the power for laser diode is disabled
(switch S1 is open).
Absolute maximum Ratings
All input pins must not exceed the voltage range below zero (GND) and
beyond VCC
VCC limit: Refer to table in section “Power Supply (#3)”
Peak TEC current: +/- 1.5 A
Max. /UT /OT current: 10 mA
Operating temperature range: 0 °C .. +60 °C
Best performance operating temperature range: +10 °C .. +35 °C
Storage temperature range: -20 °C .. +70 °C non condensing
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16
04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Mechanical Dimensions
The following dimensions are in millimetres (mm).
The four via holes on the corners are suitable for M3 screws. With these screws
the driver can be mounted onto an appropriate heat sink.
A
65
B
61
C
56
D
52.4
E
50.7
F
47.1
G
45.3
H
37.7
I
33.3
J
24.2
K
23.9
L
9
M
4
N
85
O
81
P
62.55
Q
53.65
R
9.5
S
9.45
T
56
U
4
V
3
W
0.8
X
1.7
Y
1.9
Z
4
A1
35.05
A2
61.05
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04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
The following dimensions are in millimetres (mm).
a
85
b
65.5
c
63.1
d
60.7
e
59.8
f
56.3
g
55.6
h
53.1
i
50.7
j
15.1
k
24
l
31.1
m
65
Laser
Diodes
Germany and Other Countries
Laser Components Germany GmbH
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.com
France
Laser Components S.A.S.
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.fr
United Kingdom
Laser Components (UK) Ltd.
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.co.uk
Nordic Countries
Laser Components Nordic AB
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.se

18
04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
I²C Interface
The driver is equipped with a standard I²C slave interface. It supports 7 bit slave
addressing and is 3.3 / 5 V compatible. It implements an I²C ram with 32 bit wide data
words. An internal address counter increments automatically as soon as 3 bytes of a
register are read/written. All registers are big endian encoded. It is possible to read out or
write all registers in a row. Any changes are applied as soon as a complete register is
written. Write commands need some time to complete, thus the I²C slave uses the clock
stretching technique to notify the master that it is not ready. The I²C master must be able
to detect clock stretching if more than one register is written at a time.
The following table shows the internal register assignment:
Address
Name
Register
Unit
0
bias min
32 bit
mA
1
bias max
32 bit
mA
2
bias setpoint*
32 bit
mA
3
uamplitude min
32 bit
--
4
uamplitude max
32 bit
--
5
uamplitude setpoint*
32 bit
--
6
actual +5V LD
32 bit
0.01 V
7
actual +5V TEC
32 bit
0.01 V
8
actual TEC temperature
32 bit
0.1 °C
9
actual TEC current
32 bit
0.1 °C
10
actual NTC temperature
32 bit
0.1 °C
11
TEC Kp min
32 bit
--
12
TEC Kp max
32 bit
--
13
TEC Kp
32 bit
--
14
TEC Ki min
32 bit
--
15
TEC Ki max
32 bit
--
16
TEC Ki
32 bit
--
17
TEC Kd min
32 bit
--
18
TEC Kd max
32 bit
--
19
TEC Kd
32 bit
--
20
TEC min setpoint
32 bit
0.1 °C
21
TEC max setpoint
32 bit
0.1 °C
22
TEC setpoint
32 bit
0.1 °C
23
TEC current limiter max
32 bit
0.01 A
24
TEC current limiter min
32 bit
0.01 A
25
TEC current limiter setpoint
32 bit
0.01 A
26
Vref min
32 bit
0.01 V
27
Vref max
32 bit
0.01 V
28
Vref setpoint
32 bit
0.01 V
29
ERROR register
32 bit
--
30
LSTAT register
32 bit
--
31
Pulse width min
32 bit
1 ps
32
Pulse width max
32 bit
1 ps
33
Pulse width setpoint
32 bit
1 ps
34
Pulsgen Rep rate min
32 bit
1 Hz
35
Pulsgen Rep rate min
32 bit
1 Hz
36
Pulsgen Rep rate setpoint
32 bit
1 Hz
37
LD current min
32 bit
0. 1 %
38
LD current max
32 bit
0. 1 %
39
LD current setpoint
32 bit
0. 1 %
* calibrated and fixed by the manufacturer
Laser
Diodes
Germany and Other Countries
Laser Components Germany GmbH
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.com
France
Laser Components S.A.S.
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.fr
United Kingdom
Laser Components (UK) Ltd.
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.co.uk
Nordic Countries
Laser Components Nordic AB
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.se

19
04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Controlling the BFPS-VRHSP 02 using a PLB-21
To control the driver with a PLB-21 it must be connected via the enclosed cable.
When the PLB-21 is connected the first time you are asked to download a new
driver. This must be confirmed with “yes” for working the PLB-21 properly.
Menu Structure
The following diagram shows the structure of the PLB-21 menu which affects the
driver. All entries are described in detail. All other menu entries are described in
the PLB-21 manual. For detailed instructions see the PLB-21 manual.
Menu root
-Setpoint1
oPulsewidth
oReprate
oCurrent
-Setpoint2
oLD-Power
oVref
-TEC Setpoint
oTEC stp.
oTEC act.
-TEC Control
oKp
oKi
oKd
oImax (A)
-Measurement
o5V
o5V1
oTemp TEC
oI TEC
oTemp NTC
-Factory setttings
oBias
oUamplitude
-Defaults
odef. pwron
oload defaults
osave defaults
-I2C
oI2C Addr.
Laser
Diodes
Germany and Other Countries
Laser Components Germany GmbH
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.com
France
Laser Components S.A.S.
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.fr
United Kingdom
Laser Components (UK) Ltd.
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.co.uk
Nordic Countries
Laser Components Nordic AB
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.se

20
04/23 / V02 / MaH-IF / manuals/picolas/bfps-vrhsp-02-highspeed-seed-driver-manual
Setpoint 1
Pulsewidth
This value adjusts the pulse width of the laser diode current in a range of
0 .. 10 ns.
Reprate
This value is part of the internal trigger generator. This point is still in
process and should be set by 0 Hz. The internal generator is deactivated by
value 0 Hz.
Current
This value adjusts the current of the laser diode. 0 % .. 100 % set the output
current in a range of 0 mA .. 2 A.
Setpoint 2
LD-Power
This value adjusts the automatic safety function for activating of laser diode
power.
Auto mode:
If +5 V VCC and the temperature of the PCB is in the allowed range the
power supply for the laser diode will be enable.
By detection of errors the power supply for the laser diode will be disabled.
OFF mode: permanent disable the power supply for laser diode.
Vref
This value is the “threshold level” of the laser firing monitor. If the
photocurrent is higher than the level, the monoflop will be triggered and the
laser firing output is set high.
TEC Setpiont
TEC stp.
This value defines the temperature setpoint of the TEC controller.
TEC. act.
This value shows the actual measured temperature of the TEC controller.
TEC Control
Kp
This value defines the strength of the proportional part of the TEC controller.
Factory setting is 2.0.
Ki
This value defines the strength of the integral part of the TEC controller.
Factory setting is 0.04.
Kd
This value defines the strength of the differential part of the TEC controller.
Factory setting is 0.0.
Laser
Diodes
Germany and Other Countries
Laser Components Germany GmbH
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.com
France
Laser Components S.A.S.
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.fr
United Kingdom
Laser Components (UK) Ltd.
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.co.uk
Nordic Countries
Laser Components Nordic AB
Tel: [phone]
Fax: [phone]
[email protected]
www.lasercomponents.se