PICOLAS PL-TEC-2-1024 Manuale utente

User

UserUser

User Manual

Manual Manual

Manual

Rev.

Rev. Rev.

Rev. 11

1111

11.

.10

1010

PLPL

PL-

-TEC

TECTEC

TEC-

-2

-1024

10241024

1024

Table of Contents

PL-TEC-2-1024............................................................................................................................ 1

Table of Contents ....................................................................................................................... 2

Description of Connections......................................................................................................... 3

How to get started wit an PLB-21 ............................................................................................. 7

How to get started wit out an PLB-21........................................................................................ 7

Dos and Don’ts........................................................................................................................... 8

Absolute Maximum Ratings ........................................................................................................ 8

Functional Description ................................................................................................................ 9

Power Supply............................................................................................................................ 10

Cooling..................................................................................................................................... 10

Over Temperature S utdown.................................................................................................... 10

Mec anical Dimensions ............................................................................................................ 11

Power on self test ..................................................................................................................... 12

Controlling t e driver................................................................................................................ 12

Controlling t e driver using a PLB-21........................................................................................ 13

Controlling t e driver via PC ..................................................................................................... 16

Register description .................................................................................................................. 30

Description of Connections

T e following drawing s ows all connections w ic are available to t e user.

VCC Supply voltage 12..48V, 50 V max.

GND Supply ground

LD+ Positive laser diode output (anode). Use bot connectors parallel for ig

currents.

LD- Negative laser diode output (cat ode). Do not connect to ground! Use bot

connectors parallel for ig currents.

LDP-C BOB Conn Mini-MOLEX Connector for Analogue/TTL-Control of t e driver (see below)

RS232/PLB21-Conn Mini-MOLEX Connector for RS232 Communication or PLB21 (see below)

VCC

GND

TEC connector

screw terminals

(refer to table)

Switc

(s own in upper

position)

4 Holes for

Heatsink

(3.1 mm troug )

LDP

BOB

Connector (Pin 1 marked)

RS232 / PLB

Conn.

(Pin 1 marked)

NTC and

PT100

connectors

(see table)

For a more convenient use of t e driver (e.g. in laboratory use) we recommend t e

optional available product accessory LDP-C-BOB. Please see LDP-C-BOB manual for

furt er details.

Pin-Assignments and Description of t e MOLEX-Pin eaders. T e pictures are in t e

same view t an t e overview picture.

Pin Number Description Direction Comments

1 (Marked in red) reserved Do not connect!

2 reserved Do not connect!

3 reserved Do not connect!

4 ENABLE Input 0V = disabled, 3,3 V = driver enabled

5 TEC_OK Output 0V = Pulser not ok or

oror

or power up self test not

passed yet; 3,3V = Pulser ok / test passed

6 GND Output

7 reserved

8 (rig t) GND Output Do not connect!

Pin Number Description Direction Comments

1 (Marked in red) +12 V Output Only for t e use wit t e PLB21, prevent any

overload or s ort ! (Max 100 mA)

2 TXD I/O RS232-Standard serial interface

3 RXD I/O RS232-Standard serial interface

4 (rig t) GND Output

Pin-Assignments and Description of t e T ermistor-Pin eaders. T e pictures are in t e

same view t an t e overview picture.

Warning: For improved EMI noise immunity t e leads of t e t ermistors must be kept

floating. T e GND-Pins of t e PT100 can be used for s ielding. S ielding

must be kept single ended, too.

Remark: T e targeted value for t e NTC is 10k (Factory set). If you need 1k NTCs or a

low temperature, switc from 10k to 1k via software command.

Single C annel operation

Switc in lower position

Dual C annel

Operation

Switc in s own position

NTC C - 1

C annel 1

NTC 10 k / 1 k NTC C - 1 Return

NTC C - 1 Return

No function,

do not connect

NTC C - 2 Return

C annel 2

NTC 10k / 1k No function

NTC C - 2

PT100-C 1

C annel 1

PT 100

PT100-C 1 Return (GND)

No function (GND)

PT100-C 2 Return (GND)

C annel 2

PT 100 No function

PT100-C 2

Pin-Assignments and Description of t e TEC srew terminals. T e pictures are in t e

same view t an t e overview picture.

Picture of t e pcb in same position as in main

overview

Output

name

Dual C annel

operation

Switc in

s own position

Single

C annel

operation

Switc in

lower

position

GND

TEC - 2

TEC

GND

TEC- 1

Remark: T e polarity of t e TEC cannot be c anged by software command. T erefore, if t e TEC eats

or cools uncontrollable, t e polarity as to be c anged manually.

Remark: If t e switc is altered during power-on t e TEC will s utdown itself until t e power is

toggled.

Warning: For single c annel operation t e user must connect Output A wit B and C wit D as s own.

How to get started with an PLB-21

S ep # W at to do Note

1 Unpack your Device.

2 Connect t e PLB-21 Use PLB-21 Pin eader and special cable

3 Apply t e supply voltage. Apply any voltage between 12 V and 48

V at “VCC” wit respect to GND.

4 Wait until “pulser-ok” is ig Pin 5 wit respect to Pin 6 must turn from

0V to 3.3 V

5 Apply t e temperature setpoint Use t e PLB-21 to adjust t e setpoint

temperature by turning t e dial

6 Set enable pin “ ig ”. Apply 3.3 V to pin 4 of t e BOB

connector. T e current will start up now.

7 C eck If t e Driver is not proper cooled, it will

s ut down.

How to get started without an PLB-21

Remark: T e temperature setpoints can not be applied analogue. However t e usage of t e driver

wit out any digital interface (RS232 via PC or PLB21) is possible w en all necessary settings

ave been done previously.

Dos and Don’ts

Never make a s ort at t e output. T is will not do any arm to t e laser driver but will yield in an

incorrect current measurement.

Mount t e driver on an appropriate eat sink. T e driver will s ut down under over temperature

circumstances. Depending on t e desired current a slig t airflow across t e black coils on top is

necessary. Please keep t e temperature of t ese devices below 85°C

Never connect eit er of t e TEC Outputs to GND / VCC as t e polarity of t e output clamps

c anges w en t e TEC switc es from eating to cooling or from cooling to eating.

Absolute aximum Ratings

Supply voltage range: +12 V ... +50 V max during operation. Destroying limit: 56 V

Maximum input current: 20 A

Maximum TEC output current in single c annel mode: 10 A

Maximum TEC output current in dual c annel mode: 5 A

BOB-connector input and output voltages: 0 V to 3.3 V (Terminals are 5 V proof)

BOB-connector output currents: 1 mA

Auxiliary 3.3 V supply voltage output current: 30 mA (Pin 8 of BOB-Conn planned for Rev 2.1)

Auxiliary 12 V supply voltage output current: 100 mA (Pin1 of PLB-21 Conn)

Operating temperature: 0 - 55 °C

Functional Description

T e PL-TEC operating principle is based on t e LDP-CW 2050. LDP-CW operates wit four parallel

buck converters (S1, S2, D1, D2, L1; S3, S4, D3, D4, L2; S5, S6, D5, D6, L3; S7, S8, D7, D8, L4). Every

single converter as an independent control loop wit a current sensor (Imeas1, Imeas2, Imeas3 and

Imeas4). T e set point current t at is pretended by t e user is evenly spread over all four converters.

Several security features protect t e laser diode and LDP-CW from damage. D8 protects t e laser

diode from reverse currents w ile D7 protects t e driver in case of a load failure. In case of a failure,

t e control unit disables t e LDP-CW. A soft-start mec anism slowly raises t e current after enabling

t e LDP-CW.

In contrary to t e LDP-CW 2050 all 4 c annels are linked to separate screw terminals. Furt ermore

t ey are terminated wit an RC-Filter to reduce t e EMI noise on t e TEC.

Operation Principle of LDP-CW 20 50 driver

Elemen Func ion

S1, S2, S3, S4, S5, S6, S7, S8,

D1, D2, D3, D4, D5, D6, D7,

D8, L1, L2, L3, L4

Buck Converter

C0 Input Buffer Capacitor

D7, D8 Free w eeling and driver protection diodes

Power Supply

T e power supply must be able to cover t e output power plus t e internal power losses (refer to next

c apter). Example: You ave a 48 V power supply. T e maximum TEC power will be 240 W at 6 A. T e total

power consumption will be: 240 W + 12 W = 252 W. Divided by 48 V t is yields 5.25 A (better 6 A) of

current consumption at t e DC-Terminals.

Cooling

T e driver produces up to 31 W of losses. T us t e base plate as to be mounted on a eat sink to

ensure proper operation and prevent an over temperature s utdown. If working wit ig currents

above 5 A it is recommended to cool t e power inductors as well. T is can be ac ieved easily by

placing t e pulser wit its eat sink in t e air flow of a fan.

Power dissipation vs. LD-current

1 1,5 2 2,5 3 3,5 4 4,5 5 5,5 6 6,5 7 7,5 8 8,5 9 9,5 10

Iout in A

Losses in W

Power dissipation over output current

Power dissipation over output currentPower dissipation over output current

Power dissipation over output current

Over Temperature Shutdown

To protect itself, t e LDP-CW automatically s uts down itself if its temperature rises above 80°C. T is

condition is latc ed and t e appropriate bit in t e ERROR register is set. To re- enable t e LDP-CW t e

ENABLE pin must be toggled.

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