Wavelength Electronics LDTC0520, Datasheet And Operating Manual

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LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER
PIN DESCRIPTIONS
Table 1. Pin Descriptions and Wire Colors
PIN NAME
CABLE
COLOR
PIN DESCRIPTION
Connector J1, Cable WCB303 (included with LDTC0520 and LDTC1020)
1 V
DD_FL
Green
Laser driver and laser diode power supply input; 3 to 12 VDC. Current rated to at least 1.1‑times
the laser diode forward current plus the driver quiescent current. Low-noise switching power supply
recommended. Reference the Safe Operating Area calculator.
2 V
DD_WTC
Red
Temperature controller power supply input; 5 to 12 VDC. Current rated to at least 100 mA. Low‑
noise switching power supply recommended. Reference the Safe Operating Area calculator.
3 V
S
White
Power supply input for driving the TEC or resistive heater; 5 to 30 VDC. Current rated to at least
1.1-times the TEC maximum drive current. Low-noise switching power supply recommended.
Reference the Safe Operating Area calculator.
4 GND Black
Power supply ground.
This is the only ground connection designed as a high current power supply return.
Connector J2, Cable WCB302 (included with LDTC0520 and LDTC1020)
1 SP1 — No connection
2 SP2 — No connection
3 LD SHD Red
Laser diode shutdown / interlock input. 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.
4 COM Green/Blk Low current return for monitors, inputs, and status pins. Do not use for high current return.
5 EXT LD SET White
External laser diode setpoint input, optional. Range 0 to 2 V. Input impedance 5 kΩ. Transfer function
shown in Table 2 . Set the LDREF switch to EXT to reference this input signal. The EXT LD SET
voltage
does not
sum with the onboard trimpot setting. Not TTL-compatible.
6 COM Green Low current return for monitors, inputs, and status pins. Do not use for high current return.
7 LD P M Orange/Blk 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 .
8 LD I M Blue
Laser current monitor output. The signal on this pin is proportional to the actual laser output current.
Transfer function shown in Table 2 .
9 ACT T M Red/Blk
Actual temperature sensor voltage monitor output. Output voltage equals the voltage drop across
the temperature sensor. Voltage range 0 V to V
DD_WTC
.
10 SET T M White/Blk
Temperature setpoint voltage monitor output. Output voltage equals the temperature sensor
setpoint voltage set by the onboard trimpot or the EXT T SET input.
11 EXT T SET Orange
External temperature setpoint input, optional. Range 0.3 to (V
DD_WTC
‑ 2). Input impedance > 1 MΩ.
Transfer function shown in Table 2 . This voltage
does not
sum with the onboard trimpot setting.
Set the TREF switch to EXT to reference the EXT T SET input signal. Not TTL-compatible. If the
signal falls below 0.3 V the setpoint will default to 1 V. To reset the default safety circuit, the EXT T
SET voltage must be > 0.4 V.
12 COM Black Low current return for monitors, inputs, and status pins. Do not use for high current return.
Connector J3, Cable WCB301 (included with LDTC0520 and LDTC1020)
1 LDC Black Laser diode cathode connection
2 PDA White Photodiode anode connection
3 SP3 Blue No connection
4 LDA Red Laser diode anode connection
5 COM Green Low current return for monitors, inputs, and status pins.
Do not use for high current return.
6 TEC+ Red/Blk
Positive side of TEC. This pin supplies the current to the TEC (when using NTC sensors). Refer
to the operating instructions for proper connections to a TEC or Resistive Heater based on
the type of sensor being used.
7 TEC– Orange Negative side of TEC. This pin sinks the current from the TEC (when using NTC sensors).
8 SEN+ White/Blk Positive side of temperature sensor. Bias current is driven from SEN+ to SEN–.
9 SEN– Orange/Blk
Ground connection for the temperature sensor. Refer to the Specifications table for input voltage
range.
Do not use for high current return.
10 COM Green/Blk Low current return for monitors, inputs, and status pins. Do not use for high current return.