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LDTC0520 / LDTC1020
PAGE 7
LDTC1020-00400-A Rev B
C3 to +12V between pins 1 & 4 to power the control
electronics and the output drive to the Laser Diode. Use the
online Safe Operating Area calculator to make sure maximum
internal power dissipation in the FL is not exceeded .
C5 to +28V between pins 2 & 4 to power the control
electronics of the WTC.
C5 to +28V between pins 3 & 4 to drive the TEC
output stage - Use the online Safe Operating Area calculator to
make sure maximum internal power dissipation in the WTC is not
exceeded.
High Current Return / Ground
Spare connection for your use - test point, etc.
Spare connection for your use - test point, etc.
GND = Enable Laser Diode Current
Input >3V = Disable Laser Diode Current
Low current GND for monitors, DACs, External VSET, etc.
Voltage Input range is 0 to 2V. The transfer function is given
on page 19.
Low current GND for monitors, DACs, External VSET, etc.
Monitor the laser diode power. The Photodiode Current Monitor
indicates a voltage proportional to the current produced by the
monitor photodiode. The transfer function is given on page 18.
Monitor the laser diode forward current. The Laser Diode Current
Monitor indicates a voltage proportional to the current fl owing
through the laser diode. The transfer function is given on page 18.
Monitor the actual voltage produced by the temperature sensor.
The voltage produced and transfer function correlating to
temperature is determined by the sensor being utilized.
Monitor the temperature setpoint voltage. The voltage produced
and transfer function correlating to temperature is determined by
the sensor being utilized.
Connect a voltage source between Pin 11 (EXT T SET) and Pin
12 (GND) to control the temperature setting remotely. A default
value of 1V (about room temperature with 10k
Ω
thermistor) will be
seen by the WTC if the voltage at this pin drops below 0.3V.
Low current GND for monitors, DACs, External VSET, etc.
Cooling current fl ows from this pin when using an NTC sensor.
Heating current fl ows from this pin when using an NTC sensor.
Temperature Voltage
Temperature Sensor return path
Low current GND for monitors, DACs, External VSET, etc.
PIN DESCRIPTIONS
Supply Voltage to Laser
Driver Control Electronics
and Laser Diode
Supply Voltage for
Temperature Controller
Electronics
Supply Voltage to Output
TEC Drive
Power Supply Ground
Spare 1
Spare 2
LD Shutdown / Interlock
Common
Remote Laser Diode
Setpoint
Common
Photodiode Monitor
LD Current Monitor
Actual Temp Monitor
Setpoint Monitor
Remote Temperature
Setpoint
Common
Laser Diode Cathode
Photodiode Anode
Photodiode Cathode
Laser Diode Anode
Common
TEC + connection
TEC - connection
Temperature
Temperature Sensor -
Common
VDD_FL
VDD_WTC
VS
GND
SP1
SP2
LD SHD
COM
EXT LDSET
COM
LD P M
LD I M
ACT T M
SET T M
EXT T SET
COM
LDC
PDA
PDC
LDA
COM
TEC+
TEC-
SEN+
SEN-
COM
1
2
3
4
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
Connector 1 (J1)
Pin
Pin # Name
Function
Connector 2 (J2)
Connector 3 (J3)
