LDT
5500B
SeriesThermoelectric
Temperature
Controller

Specifications

Product Features

TEMPERATURE CONTROL OUTPUT
1

Temperature Control Range:
Temperature Setpoint Resolution:
Temperature Setpoint Accuracy:2
Thermistor:
AD590:
LM335:
Short-Term Stability (1 hr):3
Long-Term Stability (24 hr):3

TEC OUTPUT

Type:
Control Algorithm
Compliance Voltage:
Maximum Output Current:
Maximum Output Power:
Current Noise and Ripple:6

LDT-5525Bo

LDT-5545Bo-99 C to 199.9 C
0.1oC±0.2oC±0.2oC±0.5oC±0.5oC±0.006oC±0.01oC-99oC to 199.9oC
0.1oC±0.2oC±0.2oC±0.5oC±0.5oC±0.006oC±0.01oC

Bipolar current source
Smart Integrator, Hybrid PI>6 V DC (@ 4A)
4.0 A
24W 4
<1 mA rms

Bipolar current source
Smart Integrator, Hybrid PI>10 V DC (@ 5A)
5.0 A
50W5
<1 mA rms

0 - 4.0 A+ 50 mA

0 - 5.0 A+ 50 mA

2-wire NTC
AD590/LM335
2-wire RTD, 100, 500, 1k

2-wire NTC
AD590/LM335
2-wire RTD, 100, 500, 1k

10 /100 A
AD590 = 8V
LM335 = 0.6 mA

10 / 100 A
AD590 = 8V
LM335 = 0.6 mA

24W and 50W models
Low noise, bi-polar output
Typical drift less than +0.004oC
Wide temperature control range-99oC to +199oC
Operational with thermistors and
IC temperature sensors

CURRENT LIMIT
Current Limit Range:
Current Limit Set Accuracy:

TEMPERATURE SENSOR

Smart integrator control loop with
fast response and temperaturesettling

Types

Thermistor:
IC Sensor:
RTD Sensor:7
Thermistor Sensing Current:
IC Sensor Bias:
Usable Thermistor Range:
User Calibration
Thermistor:
IC Sensor:

250-450,000 , typical

250-450,000 , typical

Steinhart-Hart, 3 constants
Two point

Steinhart-Hart, 3 constants
Two point

Analog Output: 8
Transfer Function:
Thermistor:
LM335:
AD590:

0-5V

0-5V

10 k/V
1 V/V
100 A/V

10 k/V
1 V/V
100 A/V

4 digit green LED-99.9oC to 199.9oC

4 digit green LED-99.9oC to 199.9oC

0.1oC
0.15oC
0.15oC+0.5oC

0.1oC
0.15oC
0.15oC+0.5oC

2.0 - 450 k
0.25 - 45.0 k

2.0 - 450 k
0.25 - 45.0 k

0.1 k
0.01 k+0.05% of FS
-4.00 to 4.00 A
0.01 A+0.03 A

0.1 k
0.01 k+0.05% of FS-5.00 to 5.00 A
0.01 A+0.03 AUSB 2.0 serial interface

The new LDT-5500B Series Temperature Controllers are
optimized for precision temperature control of laser diodes
and other optoelectronic components. Two models combine
up to 24W and 50W of thermoelectric control power with ahybrid smart-integrator feedback loop for precise temperature
control. The LDT-5500B Series accept thermistor, IC, and RTD
temperature sensors providing convenience and flexibility overa broad range of temperature control applications.
These instruments utilize a hybrid smart integrator algorithm
to ensure fast settling times and maintain high temperaturestability, typically within +0.004oC. A new simple, intuitive front
panel interface makes these instruments easy to use and with ILX
interconnect cables and the industry’s widest selection of laser
diode mounts, you can set up and be controlling the temperatureof your laser diode in minutes.
The new USB interface and control software allows for fast,
repeatable instrument control in R&D and manufacturing testingand other automated control applications.

TEC MEASUREMENT (DISPLAY)
Display Type:
Temperature Range:
Temperature Resolution
Thermistor:
AD590:
LM335:
Accuracy:2
Thermistor Resistance Range
10 A:
100 A:
Thermistor Resistance Resolution
10 A:
100 A:
Thermistor Resistance Accuracy:
TE Current Range:
TE Current Resolution:
TE Current Accuracy:



OUTPUT CONNECTORTEC I/O:
Analog Output:
Communication:

15 pin, D-sub
BNC
USB

GENERAL
Power, VAC (50-60 Hz)
Current Draw (5525B):(5545B):
Size:
Weight:Operating Temperature:
Storage Temperature:
Humidity:

100 + 10%; 120 + 10%; 230 + 10%
100-120VAC: 0.86A; 230VAC: 0.42A
100-120VAC: 1.16A; 230VAC: 0.55A
88mm x 185mm x 304mm
3,5” x 7.3” x 12”
3.6 kg (8 lbs.)
0oC to 40oC
-40oC to 70oC
<80% relative, non-condensing

NOTES
1.
Actual temperature control range depends primarily on the thermal load, sensor and TE module used.
2.
3.
4.
5.
6.
7.
8.

Accuracy figures are quoted for a typical 10 k thermistor and 100 µA current setting. Accuracy figures are relative
to the calibration standard. Both resolution and accuracy are dependent upon the user-defined configuration of the instrument.
Stability is a strong function of the thermal environment of the temperature sensor and the TE module. Ambient air currentsin particular can cause fluctuations of 0.1°C in an exposed mounting configuration.
Output power rated into a 1.5 load.
Output power rated into a 2.0 load.
Measured with the instrument in ITE mode at half scale output over a bandwidth of 10 Hz to 10 MHz.
With use of optional TSC-599 Temperature Sensor Converter.
0 to 5V representing measured temperature.

ORDERING INFORMATION
LDT-5525B
LDT-5545B

24W Thermoelectric Temperature Controller
50W Thermoelectric Temperature Controller

CC-501S
CC-505S
TS-510TS-520TS-521TS-523TS-525TS-530TS-540
RM-134
RM-135
TSC-599

TE Controller / Unterminated Interconnect CableTE Controller / Laser Diode Mount Interconnect Cable
10 k Calibrated Thermistor
10 k Uncalibrated Thermistor
5 k Uncalibrated Thermistor
20 k Uncalibrated Thermistor
100 k Uncalibrated Thermistor
AD590LH IC Temperature Sensor, uncalibrated
LM335AH IC Temperature Sensor, uncalibrated
Single Instrument Rack Mount Kit
Dual Instrument Rack Mount Kit
RTD Temperature Sensor Converter

In keeping with our commitment to continuing improvement, ILX Lightwave reserves the right tochange specifications without notice or liability for such changes.

For information call
P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

www.ilxlightwave.com

1-800-459-9459
International Inquiries: 406-556-2481
email: sales@ilxlightwave.com

Rev02.120309

Exceptional Value for
Temperature Controlling Laser Diodes

LDT
5500B
SeriesThermoelectric
Temperature
Controller

Thermoelectric
Temperature
Controller

The LDT-5500B Series are a precision, microprocessor
based thermoelectric (TE) temperature controller thatdeliver a low noise, bipolar constant current output of up
to 5 Amps and 50W of heating or cooling power. These
instruments close a precision temperature control loop
through a variety of temperature sensors and display
temperature from -99oC to 199oC or sensor resistance.
The temperature controller topology, paired with ahybrid smart-integrator control loop result in fast settling
times with a temperature stability of 0.004oC which
is ideal for laser diode or optoelectronic component
testing requiring stable wavelength and optical power.

PRECISION TEMPERATURE CONTROLThe 5500B’s operate in constant temperature, constantresistance (sensor), or constant current mode. Attention
to detail in the design of the low noise current source,
feedback loop, and sensor measurement circuits ensure
accurate, low noise temperature control that won’t drift
over time in any of the instrument operating modes.
In constant temperature mode, the instrument will control
to a setpoint temperature between -99oC and 199oC
depending on the thermoelectric module performance
characteristics, heat load, and temperature sensor
connected to the instrument. Because these instruments
are micro-processor controlled, the temperature can bedisplayed in oC accurately with the appropriate sensor
constants entered through the front panel or USB
interface.
Even with two-terminal thermistors and their non-linear
relationship between temperature and resistance and IC
temperature sensors where a highly linear relationshipexists between temperature and voltage or current,by using the appropriate equation for the selected
temperature sensor and the pertinent calibration
constants, residual errors of less than 0.01oC can berealized over wide temperature ranges.
The 5500B’s low noise bipolar current source reduces
the noise coupled to your laser diode for precise control
and measurements in your application.

WIDE TEMPERATURE CONTROL RANGE
The 5500B’s offer user-selectable thermistor source
currents of 10 A and 100 A allowing the instruments

LDT
5500B
Seriesto measure resistance from 250 to 450k providing
control over a wide range of temperatures andapplications. For a typical 10 k thermistor, thiscorresponds to a temperature control range from -25oC
to 60oC. Other temperature control ranges are possible
by choosing different resistance value thermistors.
For more information, refer to ILX Application Note
“Selecting Thermistors for Temperature Control”.
In addition to compatibility with a wide range ofthermistors, the LDT-5500B also accepts IC temperature
sensors and with the TSC-599 sensor converter,
platinum RTD sensors. Depending on the temperature
sensor selected, the LDT-5500B measures thethermistor resistance, the AD590 current or the LM335
voltage, calculates the temperature for display andcontrols precisely to a temperature set point.
1 Hour Stability
0.02

0.015

0.01
Temperature Change (ºC)

LDT
5500B
Series0.005

0-0.005-0.01-0.015

-0.02
0.01

0.21

0.41

0.61

0.81

1.01

1.21

Elapsed Time (Hrs)

The LDT-5500B demonstrates temperature stability better
than +0.004oC over one hour.

SIMPLE, EASY TO OPERATEINSTRUMENT
Configuration of the LDT-5500B for your application ismade even easier through a new front panel interface.
Display modes are selectable for temperature,
resistance, and current readout, easily visible with thebright green LED 4-digit display. SELECT and SET
controls along with the rotary control knob allows you
to quickly set temperature setpoints along with sensor
calibration constants, output current limits, temperature
limits, and the control loop gain. With ILX interconnect
cabling and a wide variety of laser diode mounts, you
can set up and control temperature within minutes.

Thermoelectric
Temperature
Controller

SAFEGUARDING YOUR DEVICESSIMPLIFY ROUTINE MAINTENANCE

In addition to normal instrument control and operating
modes, the current output of the LDT-5500B’s arebound by fully independent programmable current limits.
The temperature control loop can also be bound by
programmable temperature limits. Adjustment of eitherof the limit settings is easy and precise even with the
instrument controlling temperature. Furthermore, if atemperature sensor or the TE module should open, the5500B automatically shuts the control output off and lights
up a front panel LED indicating the cause of the fault.

The LDT-5500B architecture simplifies routing
maintenance; calibration of the TEC current and sensor
measurement can be performed via the front panel orthrough USB interface, without opening the instrument
up or manual adjustments. A calibration mode isentered through unique push button combinations orremote commands, and all calibration data is easily
entered via the front panel or USB interface. Calibration
data is automatically stored in on-board non-volatilememory.

AUTOMATE INSTRUMENT OPERATION
Remote instrument operation is available on all LDT5500B Temperature Controllers through a USB 2.0 serial
computer interface. All instrument controls and functions
are accessible through the interface for easy remote
programming and control in automated test and control
systems where repeatable and accurate test sequencing,measurements, and data handling are required.
Installation software available with each instrument
in a very easy to read and change format facilitates
instrument set up and control. Through this software,
instrument controls are organized similar to the front
panel for easy, intuitive remote control and monitoring.

PUT OUR EXPERTISE TO WORKILX Lightwave is a recognized world leader in Laser
Diode Instrumentation and Test Systems. Our
products are not only renowned for their reliability,
quality, and value, they’re backed by industry-leading
after sales support. For more information about theLDT-5500B Series Temperature Controllers, and ourcomplete family of Laser Diode Instrumentation andTest Systems, call us today or visit our website atwww.ilxlightwave.com.

Thermoelectric
Temperature
Controller

The LDT-5500B Series are a precision, microprocessor
based thermoelectric (TE) temperature controller thatdeliver a low noise, bipolar constant current output of up
to 5 Amps and 50W of heating or cooling power. These
instruments close a precision temperature control loop
through a variety of temperature sensors and display
temperature from -99oC to 199oC or sensor resistance.
The temperature controller topology, paired with ahybrid smart-integrator control loop result in fast settling
times with a temperature stability of 0.004oC which
is ideal for laser diode or optoelectronic component
testing requiring stable wavelength and optical power.

PRECISION TEMPERATURE CONTROLThe 5500B’s operate in constant temperature, constantresistance (sensor), or constant current mode. Attention
to detail in the design of the low noise current source,
feedback loop, and sensor measurement circuits ensure
accurate, low noise temperature control that won’t drift
over time in any of the instrument operating modes.
In constant temperature mode, the instrument will control
to a setpoint temperature between -99oC and 199oC
depending on the thermoelectric module performance
characteristics, heat load, and temperature sensor
connected to the instrument. Because these instruments
are micro-processor controlled, the temperature can bedisplayed in oC accurately with the appropriate sensor
constants entered through the front panel or USB
interface.
Even with two-terminal thermistors and their non-linear
relationship between temperature and resistance and IC
temperature sensors where a highly linear relationshipexists between temperature and voltage or current,by using the appropriate equation for the selected
temperature sensor and the pertinent calibration
constants, residual errors of less than 0.01oC can berealized over wide temperature ranges.
The 5500B’s low noise bipolar current source reduces
the noise coupled to your laser diode for precise control
and measurements in your application.

WIDE TEMPERATURE CONTROL RANGE
The 5500B’s offer user-selectable thermistor source
currents of 10 A and 100 A allowing the instruments

LDT
5500B
Seriesto measure resistance from 250 to 450k providing
control over a wide range of temperatures andapplications. For a typical 10 k thermistor, thiscorresponds to a temperature control range from -25oC
to 60oC. Other temperature control ranges are possible
by choosing different resistance value thermistors.
For more information, refer to ILX Application Note
“Selecting Thermistors for Temperature Control”.
In addition to compatibility with a wide range ofthermistors, the LDT-5500B also accepts IC temperature
sensors and with the TSC-599 sensor converter,
platinum RTD sensors. Depending on the temperature
sensor selected, the LDT-5500B measures thethermistor resistance, the AD590 current or the LM335
voltage, calculates the temperature for display andcontrols precisely to a temperature set point.
1 Hour Stability
0.02

0.015

0.01
Temperature Change (ºC)

LDT
5500B
Series0.005

0-0.005-0.01-0.015

-0.02
0.01

0.21

0.41

0.61

0.81

1.01

1.21

Elapsed Time (Hrs)

The LDT-5500B demonstrates temperature stability better
than +0.004oC over one hour.

SIMPLE, EASY TO OPERATEINSTRUMENT
Configuration of the LDT-5500B for your application ismade even easier through a new front panel interface.
Display modes are selectable for temperature,
resistance, and current readout, easily visible with thebright green LED 4-digit display. SELECT and SET
controls along with the rotary control knob allows you
to quickly set temperature setpoints along with sensor
calibration constants, output current limits, temperature
limits, and the control loop gain. With ILX interconnect
cabling and a wide variety of laser diode mounts, you
can set up and control temperature within minutes.

Thermoelectric
Temperature
Controller

SAFEGUARDING YOUR DEVICESSIMPLIFY ROUTINE MAINTENANCE

In addition to normal instrument control and operating
modes, the current output of the LDT-5500B’s arebound by fully independent programmable current limits.
The temperature control loop can also be bound by
programmable temperature limits. Adjustment of eitherof the limit settings is easy and precise even with the
instrument controlling temperature. Furthermore, if atemperature sensor or the TE module should open, the5500B automatically shuts the control output off and lights
up a front panel LED indicating the cause of the fault.

The LDT-5500B architecture simplifies routing
maintenance; calibration of the TEC current and sensor
measurement can be performed via the front panel orthrough USB interface, without opening the instrument
up or manual adjustments. A calibration mode isentered through unique push button combinations orremote commands, and all calibration data is easily
entered via the front panel or USB interface. Calibration
data is automatically stored in on-board non-volatilememory.

AUTOMATE INSTRUMENT OPERATION
Remote instrument operation is available on all LDT5500B Temperature Controllers through a USB 2.0 serial
computer interface. All instrument controls and functions
are accessible through the interface for easy remote
programming and control in automated test and control
systems where repeatable and accurate test sequencing,measurements, and data handling are required.
Installation software available with each instrument
in a very easy to read and change format facilitates
instrument set up and control. Through this software,
instrument controls are organized similar to the front
panel for easy, intuitive remote control and monitoring.

PUT OUR EXPERTISE TO WORKILX Lightwave is a recognized world leader in Laser
Diode Instrumentation and Test Systems. Our
products are not only renowned for their reliability,
quality, and value, they’re backed by industry-leading
after sales support. For more information about theLDT-5500B Series Temperature Controllers, and ourcomplete family of Laser Diode Instrumentation andTest Systems, call us today or visit our website atwww.ilxlightwave.com.

LDT
5500B
SeriesThermoelectric
Temperature
Controller

Specifications

Product Features

TEMPERATURE CONTROL OUTPUT
1

Temperature Control Range:
Temperature Setpoint Resolution:
Temperature Setpoint Accuracy:2
Thermistor:
AD590:
LM335:
Short-Term Stability (1 hr):3
Long-Term Stability (24 hr):3

TEC OUTPUT

Type:
Control Algorithm
Compliance Voltage:
Maximum Output Current:
Maximum Output Power:
Current Noise and Ripple:6

LDT-5525Bo

LDT-5545Bo-99 C to 199.9 C
0.1oC±0.2oC±0.2oC±0.5oC±0.5oC±0.006oC±0.01oC-99oC to 199.9oC
0.1oC±0.2oC±0.2oC±0.5oC±0.5oC±0.006oC±0.01oC

Bipolar current source
Smart Integrator, Hybrid PI>6 V DC (@ 4A)
4.0 A
24W 4
<1 mA rms

Bipolar current source
Smart Integrator, Hybrid PI>10 V DC (@ 5A)
5.0 A
50W5
<1 mA rms

0 - 4.0 A+ 50 mA

0 - 5.0 A+ 50 mA

2-wire NTC
AD590/LM335
2-wire RTD, 100, 500, 1k

2-wire NTC
AD590/LM335
2-wire RTD, 100, 500, 1k

10 /100 A
AD590 = 8V
LM335 = 0.6 mA

10 / 100 A
AD590 = 8V
LM335 = 0.6 mA

24W and 50W models
Low noise, bi-polar output
Typical drift less than +0.004oC
Wide temperature control range-99oC to +199oC
Operational with thermistors and
IC temperature sensors

CURRENT LIMIT
Current Limit Range:
Current Limit Set Accuracy:

TEMPERATURE SENSOR

Smart integrator control loop with
fast response and temperaturesettling

Types

Thermistor:
IC Sensor:
RTD Sensor:7
Thermistor Sensing Current:
IC Sensor Bias:
Usable Thermistor Range:
User Calibration
Thermistor:
IC Sensor:

250-450,000 , typical

250-450,000 , typical

Steinhart-Hart, 3 constants
Two point

Steinhart-Hart, 3 constants
Two point

Analog Output: 8
Transfer Function:
Thermistor:
LM335:
AD590:

0-5V

0-5V

10 k/V
1 V/V
100 A/V

10 k/V
1 V/V
100 A/V

4 digit green LED-99.9oC to 199.9oC

4 digit green LED-99.9oC to 199.9oC

0.1oC
0.15oC
0.15oC+0.5oC

0.1oC
0.15oC
0.15oC+0.5oC

2.0 - 450 k
0.25 - 45.0 k

2.0 - 450 k
0.25 - 45.0 k

0.1 k
0.01 k+0.05% of FS
-4.00 to 4.00 A
0.01 A+0.03 A

0.1 k
0.01 k+0.05% of FS-5.00 to 5.00 A
0.01 A+0.03 AUSB 2.0 serial interface

The new LDT-5500B Series Temperature Controllers are
optimized for precision temperature control of laser diodes
and other optoelectronic components. Two models combine
up to 24W and 50W of thermoelectric control power with ahybrid smart-integrator feedback loop for precise temperature
control. The LDT-5500B Series accept thermistor, IC, and RTD
temperature sensors providing convenience and flexibility overa broad range of temperature control applications.
These instruments utilize a hybrid smart integrator algorithm
to ensure fast settling times and maintain high temperaturestability, typically within +0.004oC. A new simple, intuitive front
panel interface makes these instruments easy to use and with ILX
interconnect cables and the industry’s widest selection of laser
diode mounts, you can set up and be controlling the temperatureof your laser diode in minutes.
The new USB interface and control software allows for fast,
repeatable instrument control in R&D and manufacturing testingand other automated control applications.

TEC MEASUREMENT (DISPLAY)
Display Type:
Temperature Range:
Temperature Resolution
Thermistor:
AD590:
LM335:
Accuracy:2
Thermistor Resistance Range
10 A:
100 A:
Thermistor Resistance Resolution
10 A:
100 A:
Thermistor Resistance Accuracy:
TE Current Range:
TE Current Resolution:
TE Current Accuracy:



OUTPUT CONNECTORTEC I/O:
Analog Output:
Communication:

15 pin, D-sub
BNC
USB

GENERAL
Power, VAC (50-60 Hz)
Current Draw (5525B):(5545B):
Size:
Weight:Operating Temperature:
Storage Temperature:
Humidity:

100 + 10%; 120 + 10%; 230 + 10%
100-120VAC: 0.86A; 230VAC: 0.42A
100-120VAC: 1.16A; 230VAC: 0.55A
88mm x 185mm x 304mm
3,5” x 7.3” x 12”
3.6 kg (8 lbs.)
0oC to 40oC
-40oC to 70oC
<80% relative, non-condensing

NOTES
1.
Actual temperature control range depends primarily on the thermal load, sensor and TE module used.
2.
3.
4.
5.
6.
7.
8.

Accuracy figures are quoted for a typical 10 k thermistor and 100 µA current setting. Accuracy figures are relative
to the calibration standard. Both resolution and accuracy are dependent upon the user-defined configuration of the instrument.
Stability is a strong function of the thermal environment of the temperature sensor and the TE module. Ambient air currentsin particular can cause fluctuations of 0.1°C in an exposed mounting configuration.
Output power rated into a 1.5 load.
Output power rated into a 2.0 load.
Measured with the instrument in ITE mode at half scale output over a bandwidth of 10 Hz to 10 MHz.
With use of optional TSC-599 Temperature Sensor Converter.
0 to 5V representing measured temperature.

ORDERING INFORMATION
LDT-5525B
LDT-5545B

24W Thermoelectric Temperature Controller
50W Thermoelectric Temperature Controller

CC-501S
CC-505S
CC-501HTTS-510TS-520TS-521TS-523TS-525TS-530TS-540
RM-134
RM-135
TSC-599

TE Controller / Unterminated Interconnect CableTE Controller / Laser Diode Mount Interconnect Cable
TE Interconnect Cable, 15 pin to 7W2
10 k Calibrated Thermistor
10 k Uncalibrated Thermistor
5 k Uncalibrated Thermistor
20 k Uncalibrated Thermistor
100 k Uncalibrated Thermistor
AD590LH IC Temperature Sensor, uncalibrated
LM335AH IC Temperature Sensor, uncalibrated
Single Instrument Rack Mount Kit
Dual Instrument Rack Mount Kit
RTD Temperature Sensor Converter

In keeping with our commitment to continuing improvement, ILX Lightwave reserves the right tochange specifications without notice or liability for such changes.

For information call
P.O. Box 6310, Bozeman, MT 59771 • FAX: 406-586-9405

www.ilxlightwave.com

1-800-459-9459
International Inquiries: 406-556-2481
email: sales@ilxlightwave.com

Rev02.120309

Exceptional Value for
Temperature Controlling Laser Diodes

LDT
5500B
SeriesThermoelectric
Temperature
Controller