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© 2001-2013
WLD3343
PAGE 5
WLD3343-00400-O
Float or connect a zero Volt signal to Pin 1 (SHD) to ENABLE the
output current to the laser diode.
Connect a +3 Volt or greater signal to Pin 1 (SHD) to DISABLE
the output current to the laser diode.
Connect a voltage source between Pin 2 (VSET) and Pin 7
(GND) to control either the laser diode current in constant current
mode or laser diode power in constant power mode. Range
is 0-2.0 volt full scale. Input impedance is 20 k
Ω
. The offset
voltage is 0.5V when open (applies to Revision D forward).
Do
not let the input pin
fl
oat or damage to the load may result.
Monitor the laser diode forward current using Pin 3 (IMON). The
Laser Diode Current Monitor produces a voltage proportional to
the current
fl
owing through the laser diode.
Monitor the laser diode power using Pin 4 (PMON). The
Photodiode Current Monitor produces a voltage proportional to
the current produced by the laser diode monitor photodiode.
CONSTANT CURRENT OPERATION:
A 1k
resistor between Pin 5 (MODE) and Pin 6 (LIM)
con
fi
gures the WLD3343 to regulate the laser diode’s forward
current.
CONSTANT POWER OPERATION:
A 0.1
μ
F capacitor between Pin 5 (MODE) and Pin 6 (LIM)
con
fi
gures the WLD3343 to regulate the laser diode’s output
power.
A resistor connected between Pin 6 (LIM) and Pin 7 (GND) limits
the maximum amount of forward current through the laser diode
Connect the VDD power supply ground connection to Pin 7
(GND).
Connect Pin 8 (RS+) 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.
Connect Pin 9 (OUTB) to the positive side of R
SENSE.
Connect Pin 10 (RS-) 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.
PIN DESCRIPTIONS
Shutdown Laser Diode
Output Current
Setpoint Voltage Input or
Modulation Input
Laser Diode Current Monitor
Photodiode Current Monitor
Mode Con
fi
guration
Laser Diode Current Limit
Power Supply Ground
Laser Diode Current Sense
Resistor Positive Input
Output B
Laser Diode Current Sense
Resistor Negative Input
SHD
VSET
IMON
PMON
MODE
LIM
GND
RS+
OUTB
RS-
1
2
3
4
5
6
7
8
9
10
Pin
Pin # Name
Function
Pin Descriptions continued on the next page.
