Wavelength Electronics LDTC0520, Datasheet And Operating Manual

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LDTC0520 / LDTC1020 LASER DIODE AND TEMPERATURE CONTROLLER
J1
J2
J3
Status LEDs
Laser Current Enable
Laser Current Setpoint
Laser Current Limit
Temperature Current Limit B
Temperature Setpoint
Temperature Current Limit A
DIP Switches *
DIP Switch Functions
LDREF = Internal vs. External Laser Diode Setpoint
CC | CP = Constant Current vs. Constant Power Control Mode
TREF = Internal vs. External Temperature Setpoint
* DO NOT
CHANGE SWITCH POSITIONS WHILE THE OUTPUT
IS ENABLED
; D
OING SO MAY DAMAGE THE LOAD
.
!
Figure 1. LDTCxx20 Top View
QUICK CONNECT GUIDE
!
It is imperative that you verify the unit will
operate within the internal heat dissipation
Safe Operating Area (SOA).
Operating the controller outside the SOA
may damage or destroy the LDTC and/or
loads.
Visit the Wavelength Electronics website for the most
accurate, up‑to‑date, and easy to use SOA calculator:
Laser Diode Drivers:
www.teamwavelength.com/support/design-tools/soa-ld-calculator/
Temperature Controllers:
www.teamwavelength.com/support/design-tools/soa-tc-calculator/
The model number is stamped on the top cover of the
module. If the top cover is missing, the LDTC0520 has a
single FL500 on the top; the LDTC1020 has two FL500
chips─one on each side of the circuit board.
Figure 1
gives a top view.
Figure 2
is the Quick Connect diagram with a laser diode,
separate power supplies, and a thermoelectric cooler.
The LDTCxx20 is compatible with Type A and Type B lasers,
but will not drive Type C lasers; see
Figure 3
.
VDD_FL
VDD_WTC
VS
GND
SP1
SP2
LD SHD (Enable LD current)
COM
EXT LD SETpoint
COM
LD P Monitor
LD I Monitor
ACT T Monitor
SET T Monitor
EXT T SETpoint
COM
LDC
PDA
Spare
LDA
COM
TEC+
TEC-
SEN+
SEN-
COM
J1
J2
J3
V
DD_WTC
V
DD_FL
V
S
- +
See Note
Thermistor
DVM
OPEN or 3 to 5 V = DISABLE
GND = LD ENABLE
NOTE: Output current to the laser is disabled unless Pin J2:3 is grounded and the on-board switch is enabled.
1
1
4
12
1
10
Optional Laser Current
External Setpoint (0 to 2 V)
Optional
Temp Control
Ext. Setpoint
1
1
2
3
1
1. V
DD_WTC
, V
DD_FL
, and V
S
can be tied together if common voltage provides sufficient compliance for laser diode and
thermoelectric loads. Separate V
S
if higher compliance is required for the temperature controller load.
2. If using the LD SHD input, set the onboard Enable/Disable switch to Enable.
3. Refer to Electrical Specifications for input voltage range.
3
!
THE LDTC DOES NOT SUPPORT LASER DIODE
PACKAGES THAT INCORPORATE A BUILT-IN
TEMPERATURE SENSOR THAT IS CONNECTED
TO THE LASER CASE GROUND.
Figure 2. LDTCxx20 Quick Connect Wiring Diagram
Type A Laser Diode Type B Laser Diode
Type C Laser Diode
Common
Cathode
Laser Diode Anode &
Photodiode Cathode Common
Isolated Photodiode
Short the
Laser Diode Anode
to Photodiode Cathode
Common
Anode
Laser Diode Cathode &
Photodiode Anode Common
Figure 3. Laser Type Diagrams