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5

PLD SERIES LASER DIODE DRIVER

PIN DESCRIPTIONS

Table 1. Pin Descriptions

PIN

NAME

PIN DESCRIPTION

1

Aux V+

For TYPE C Laser Diodes only. See

Figure 11 on page 11.

2

PD Aux

For TYPE C Laser Diodes only. See

Figure 11.

3

LD Enable

Output Enable. Disable = ground or floating. Enable = 3 to 5 V.

Requires 5 mA input current. Not TTL-compatible.

4

LIM I Status

Status output pin. Indicates if the driver has reached current limit and has switched off the output.

Signal is < 0.3 V if the driver is in limit and output is latched off. Signal is high impedance during

normal operation. Toggle LD Enable to reset the limit circuit and enable the output current.

5

LIM I Monitor

Current Limit Monitor. Transfer function varies by model—refer to

Table 2.

Range 0 to 2.5 V. Impedance 1 kΩ. The current limit voltage should be set 0.2 V above the desired

limit level. Instructions for fine-tuning the current limit are on

page 14.

6

Common

Measurement ground. Low current return used only with Monitor pins and Analog Input.

Internally shorted to GND (pin 11).

7

I Monitor

Laser Diode Output Current Monitor. Transfer function varies by model—refer to

Table 2.

Range 0 to 2.5 V. Impedance 1 kΩ.

NOTE: I Monitor signal has artificial 20 mV offset. Subtract 20 mV for accurate reading.

8

P Monitor

Photodiode Current Monitor (power monitor). Transfer function varies by PD feedback range

setting—refer to

Table 2. Range 0 to 2.5 V. Impedance 1 kΩ.

9

Analog Input

Remote setpoint or modulation input. Transfer function varies by model and operating mode—refer

to

Table 2. Range 0 to 5 V. Impedance 1 MΩ. Not TTL-compatible. Connect Analog Input pin to

Common (pin 6) when not using the Analog Input function. The Analog Input signal sums with the

onboard setpoint value. See

Electrical Specifications for damage threshold information.

10

+5 V

Supply voltage to control electronics. Range 4.5 to 5.5 VDC. If using a single supply, the power

supply must be rated to source at least 1.1-times the laser current plus the PLD quiescent current.

11

GND

Power supply ground. Used with +5 V for high current return.

12

LD Anode /

+LD Supply

Laser Diode Anode connection. Also used as power supply input for high-compliance lasers.

Maximum input voltage 30 VDC.

13

LD Cathode

Laser Diode Cathode connection.

14

PD Anode

Photodiode Anode connection only for Type A & B lasers. Tie this pin to PD Aux (pin 2) for Type C

lasers; see

Figure 11 on page 11.

15

PD Cathode

Photodiode Cathode connection only for Type C lasers. See

Figure 11.

Table 2. Current Output Monitor, Limit Monitor, Photodiode Current Monitor, and

Analog Input Transfer Functions

FUNCTION

MODE

PLD200

PLD500

PLD1250

PLD5000

PLD6500

LIM I Monitor (Current Limit)

CC / CP

80 mA / V

200 mA / V

500 mA / V

2 A / V

2.6 A / V

I Monitor (Output Current)

CC / CP

80 mA / V

200 mA / V

500 mA / V

2 A / V

2.6 A / V

Analog Input; CC-Mode

CC

40 mA / V

100 mA / V

250 mA / V

1 A / V

1.3 A / V

P Monitor (Photodiode Current);

Low Range

CC / CP

200 µA / V

P Monitor (Photodiode Current);

CC / CP

2 mA / V

Analog Input CP-Mode;

Low Range

CP

100 µA / V

Analog Input, CP-Mode;

CP

1 mA / V

Note: High Range is not available when using Type C Lasers.