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Wavelength Electronics PLD Series, Manual

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Wavelength Electronics PLD Series Manual Download Page 2

PLD-200 / PLD-500 / PLD-5000

2

TYPE A

TYPE B

TYPE C

_____________________________________________________

Pin Descriptions

DESCRIPTION

For TYPE C laser diodes only.

  See page 12.

For TYPE C laser diodes only.

  See page 12.

Enable Output Current = +3 to +5 V
Disable Output Current = Ground or Floating
LIMIT status.            LIMIT = Ground     Normal Operation = High Impedance
If Limit is detected, laser diode current will turn off, Limit I LED will light.
Toggle LD ENABLE to restart laser diode current.
Current Limit setpoint monitor.        Impedance = 1 k

Ω

          Output 0 to 2.5 V

NOTE:

 Current limit needs to be set 0.2 V above desired limit level.

Measurement ground.  Low current return used only with pins 5, 7, 8, & 9.
Shorted to pin 11 internally.
Laser Diode current monitor.          Impedance is 1 k

Ω

         Output 0 to 2.5 V

Power monitor (PD current monitor).  Impedance = 1 k

Ω

   Output 0 to 2.5 V

Remote setpoint or modulation input.  Input impedance = 1 M

Ω

  Input 0 to 5 V

Connect Pin 9 to Pin 6 when not in use.
Supply voltage to control electronics.        Min +4.5 V         Max +5.5 V
Power supply ground.  Used with pin 10 for high current return.
Laser Diode Anode and laser diode supply connection.
RecomLD Supply for single laser is +5 V.  M30 V.

CAUTION:  Too high a voltage may thermally damage the PLD.

Laser Diode Cathode
For Type A or B laser diodes, Photodiode Anode.
See page 12 for use with Type C laser diodes.

For TYPE C laser diodes only.

  See page 12.

PIN

1
2
3

4

5

6

7
8
9

10

11

12

13
14

15

NAME

AUX V+
PD AUX

LD ENABLE

LIM I STAT

LIM I MONITOR

COMMON

I MONITOR

P MONITOR

ANALOG INPUT

+5V

GND

LD ANODE/

+LD SUPPLY

LD CATHODE

PD ANODE

PD CATHODE

The following laser diode / photodiode configurations are
currently manufactured - Type A, Type B, and Type C.  Setup
and operation vary according to your type of laser diode.

Please identify which laser diode you will be using with
the PLD and follow the appropriate operating instruc-
tions.

Operating instructions for lasers of Type A or B are detailed
on page 8.

Operating instructions for Type C Lasers are detailed on
page 12.

○○○○○○○○○○○○○

____________________________________________________

Laser Diode Types

Summary of Contents for PLD Series

Page 1: ...it LED and Limit Status indicate the current limit has been reached Two photodiode ranges provide variable sensitivities for optimum operation You can maintain excellent stability when operating in constant current constant power or modulated mode All trimpots and switches are easily accessible and offer precision control A slow start circuit mechanical shorting relay and Active Current Limit offe...

Page 2: ...not in use Supply voltage to control electronics Min 4 5 V Max 5 5 V Power supply ground Used with pin 10 for high current return Laser Diode Anode and laser diode supply connection Recommended LD Supply for single laser is 5 V Maximum 30 V CAUTION Too high a voltage may thermally damage the PLD Laser Diode Cathode For Type A or B laser diodes Photodiode Anode See page 12 for use with Type C laser...

Page 3: ...ross the laser diode 2 An oscilloscope across the laser diode 3 A current meter in series with the laser diode All measurements made with these instruments on the output should be made with a simulated load attached and not a laser diode CAUTION IF LASER DIODE AND PHOTODIODE ARE ISOLATED TYPE B LASER DIODE Short the laser diode anode to the photodiode cathode The PLD series laser diode drivers req...

Page 4: ...urrent Operating Temperature 0 to 50 C guaranteed 40 to 75 C typical Warm up 1 hour to rated accuracy Weight 0 3 Ibs Size H x W x D 1 52 x 2 65 x 0 81 PLD 200 1 52 x 2 65 x 1 10 PLD 500 1 52 x 2 65 x 1 82 PLD 5000 Connector 15 pins see page 5 for PCB layout pattern See page 16 for connector recommendation if not mounting PLD to a circuit board ___________ General Specifications Compliance Voltage ...

Page 5: ...PLD 200 PLD 500 PLD 5000 5 _____________________________________________ Mechanical Specifications _________________________________________ PCB Layout Pattern Top View ...

Page 6: ... Test Conditions PLD200 10 Ω PLD500 1 0 Ω PLD5000 0 1 Ω PLD200 10 Ω PLD500 1 0 Ω PLD5000 0 1 Ω PLD200 10 Ω PLD500 1 0 Ω PLD5000 0 1 Ω Typ 6 8 µsec 6 8 µsec 6 8 µsec 6 8 µsec 6 8 µsec 6 8 µsec 1 5 sec 1 5 sec 1 5 sec ________________________________________________ Timing Characteristics Test Setup for Parameter Measurement ...

Page 7: ...al frequency response 10 kHz square wave response Current Limit Operation PLD 500 3 5 3 2 5 2 1 5 1 0 5 0 0 5 10 100 1000 10000 100000 Frequency Hz Gain dB PLD 200 3 5 3 2 5 2 1 5 1 0 5 0 0 5 10 100 1000 10000 100000 Frequency Hz Gain dB PLD 5000 3 5 3 2 5 2 1 5 1 0 5 0 0 5 10 100 1000 10000 100000 Frequency Hz Gain dB ...

Page 8: ...0 PLD 500 PLD 5000 8 ____________________ Typical Setup for Type A or B laser diode 5V operation __________________________________ Typical Setup for Type A or B laser diode High Compliance Voltage operation ...

Page 9: ...to be set 0 2 V above desired limit level Limit Current and I Monitor Transfer Functions PLD 200 80mA Volt PLD 500 200mA Volt PLD 5000 2 Amp Volt Once Current Limit is detected the output will turn off and the LIM I led will illuminate red The LIM I Status voltage and LIM I LED will stay on until the LD Enable is toggled off then on and the error no longer exists 3 Set the output power Determine t...

Page 10: ...PLD 200 PLD 500 PLD 5000 10 __________ Typical Setup for Type A or B laser diode Negative Supply operation ...

Page 11: ...PLD 200 PLD 500 PLD 5000 11 ______________________ Operating the PLDPCB with Type A B Laser Diodes ...

Page 12: ...nstant power mode ACTIVE LIMIT CURRENT ADJUST This 12 turn trimpot adjusts the maximum laser diode forward current OUTPUT ENABLED LED Illuminates green when laser diode current is enabled The LED is not lit when the output is disabled LIMIT I LED Illuminates red when output current has reached the limit current level as set by LIMIT I Adjust Trimpot LED will stay red until the output has been disa...

Page 13: ...ch on top of PLD 2 Set Limit Current Monitor pins 5 6 adjust Current Limit trimpot clockwise until the voltage at pin 5 corresponds to the desired voltage NOTE Current limit needs to be set 0 2 V above desired limit level Limit Current and I Monitor Transfer Functions PLD 200 80mA Volt PLD 500 200mA Volt PLD 5000 2 Amp Volt Once Current Limit is detected the output will turn off and the LIM I led ...

Page 14: ...PLD 200 PLD 500 PLD 5000 14 _________________________ Operating the PLDPCB with Type C Laser Diodes ...

Page 15: ...ut Add this circuit to remove any offset Change PD Range for TYPE A or B laser diodes Put a resistor across pins 14 PD Anode and 6 Common to modify the PD range of the PLD Laser Diode Protection when using a long cable With a cable longer than two feet add a Schottky diode across the laser diode Filter the PLD Output If you don t need to modulate you can reduce the noise by filtering the output cu...

Page 16: ...ission Transportation charges or postage must be prepaid All returned products must show invoice number and date and reason for return In the United States the Food Drug Administration is responsible for monitoring laser products These products must comply with certain requirements in order to be sold to an end user The PLD series has been registered as an OEM product It does not comply with regul...

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