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4
FL591FL LASER DIODE DRIVER
PIN DESCRIPTIONS
Table 1. Pin Descriptions and Wire Colors
PIN
NAME
CABLE
COLOR
PIN DESCRIPTION
Connectors LD1, LD2; Cable FL591-00102-A
1
LDA
Red
Laser Diode Anode connection. When used in 2x–250 mA mode, LD1 and LD2
are independent and isolated from each other. When used in 500 mA mode, the
current is output via connector LD1 only.
2
PDA
White
Photodiode Anode connection. When used in 2x–250 mA mode, LD1 and LD2
are independent and isolated from each other. When used in 500 mA mode, the
current is output via connector LD1 only.
3
LDC
Black
Laser Diode Cathode connection. When used in 2x–250 mA mode, LD1 and LD2
are independent and isolated from each other. When used in 500 mA mode, the
current is output via connector LD1 only.
Connector J4, Cable FL591-00101-A
1
DIS
White
Laser diode shutdown / interlock input, optional. The onboard Enable switch must
be set to ENABLE when this external enable function is used.
TTL-compatible. Enable = Ground; Disable = OPEN or 3 to 5 V.
2
VS
Red
Power supply positive terminal.
3
GND
Black
Ground connection for power supply input.
Connectors INPUT 1, INPUT 2
Inner
V
SET1
, V
SET2
Positive connection for the external setpoint voltage signal
Shield
GND
Ground connection for the external setpoint voltage signal
Connector MON, Six-Pin Header
1
I
MON1,
Current Monitor
LD1 laser current monitor output. The signal on this pin is proportional to the
actual laser output current. Transfer function shown in Table 2.
2
P
MON1
, Power Monitor
LD1 photodiode current monitor output. The signal on this pin is proportional to
the photodiode current. Voltage range 0 to 2 V. Transfer function shown in Table 2.
3
LD1 Monitor Ground
Low current return for LD1 monitors.
Do not use for high current return.
4
I
MON2,
Current Monitor
LD2 laser current monitor output. The signal on this pin is proportional to the
actual laser output current. Transfer function shown in Table 2.
5
P
MON2
, Power Monitor
LD2 photodiode current monitor output. The signal on this pin is proportional to
the photodiode current. Voltage range 0 to 2 V. Transfer function shown in Table 2.
6
LD2 Monitor Ground
Low current return for LD2 monitors.
Do not use for high current return.
