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4

WLD SERIES LASER DIODE DRIVERS

PIN DESCRIPTIONS

Table 1. Pin Descriptions

PIN LABEL

NAME

PIN DESCRIPTION

1

SHD

Shutdown

Laser Diode

Output Current

Enable or disable output current to the laser diode using this pin.

To ENABLE: Float or connect a zero volt signal to this pin.

To DISABLE: Connect a +3 V or greater signal to this pin.

2

V

SET

Setpoint

Voltage Input

or Modulation

Input

Connect a voltage source between this pin and Pin 7 (GND) to control either the laser diode

current in Constant Current mode or the laser diode power in Constant Power mode.

Range is 0-2 V full scale.

Input impedance is 20 kΩ.

Do not let this pin float, or damage to the load may result.*

3

IMON

Laser Diode

Current

Monitor

Monitor the laser diode forward current using this pin. The laser diode current monitor

produces a voltage proportional to the current flowing through the laser diode.

Standalone: Transfer function depends on R

SENSE value. See Equation (11) on page 15.

Evaluation Board: See

Table 10 on page 20 for the transfer function.

4

PMON

Photodiode

Current

Monitor

Monitor the laser diode power using this pin. The photodiode current monitor produces a

voltage proportional to the current produced by the laser diode monitor photodiode.

Standalone: Transfer function depends on R

PD value. See Equations (12) & (13) on page 15.

Evaluation Board: See

Table 11 on page 20 for the transfer function.

5

MODE

Mode

Configuration

Configure either Constant Current or Constant Power operation using this pin.

Constant Current: Install a 1 kΩ resistor between this pin and Pin 6 (LIM).

Constant Power: Install a 0.1 μF capacitor between this pin and Pin 6 (LIM).

6

LIM

Laser Diode

Current Limit

A resistor connected between this pin and Pin 7 (GND) limits the maximum amount of forward

current through the laser diode. See

page 11 for more information.

7

GND

Power Supply

Ground

Connect the V

DD power supply ground connection to this pin.

8

RS+

Laser Diode

Current Sense

Resistor

Positive Input

Connect this pin directly to the positive side of the laser diode current sense resistor. The

resistance value of R

SENSE determines the range of forward current through the laser diode.

9

OUTB

Output B

Connect this pin to the positive side of R

SENSE.

10

RS-

Laser Diode

Current Sense

Resistor

Negative Input

Connect this pin directly to the negative side of the laser diode current sense resistor. The

resistance value of R

SENSE determines the range of forward current through the laser diode.

11

OUTA

Output A

How this pin is configured depends on laser type.

Type A/B: Connect this pin to the cathode connection of the laser diode.

Type C: Connect this pin to Pin 14 (V

DD).

12

PD+

Photodiode

Current Sense

Resistor

Positive Input

How this pin is configured depends on both laser type and operation mode.

Constant Current: For all laser types, connect both this pin and Pin 13 (PD-) to Pin 7 (GND).

Constant Power: For Type A/B lasers, connect this pin to the anode of the photodiode. For

Type C lasers, connect this pin to Pin 14 (V

DD)

13

PD-

Photodiode

Current Sense

Resistor

Negative Input

How this pin is configured depends on both laser type and operation mode.

Constant Current: For all laser types, connect both this pin and Pin 12 (PD+) to Pin 7 (GND).

Constant Power: For Type A/B lasers, connect this pin to Pin 7 (GND). For Type C lasers,

connect this pin to the cathode of the photodiode.

14

V

DD

Power Supply

Input

Power supply input for the internal control electronics.

Supply range input for this pin is model-dependent.

* NOTE: The WLD3343 has a 0.5 V offset voltage when Pin 2 is open. The WLD33ND does not have this offset voltage.