Wavelength Electronics PTC5000 User manual

Applies to PTC Product Revision A
Applies to PTCEVAL Revision A
© November 2013
ORDERING INFORMATION
PART NO DESCRIPTION
PTC5000 ±5 A Temperature Controller
PTC10000 ±10 A Temperature Controller
PTCEVAL Evaluation board for PTC-PCB
Series Controllers
TIME-TESTED RELIABILITY
The PTC Series PCB-Mount Temperature Controllers are
based on our long-proven PTC-CH linear controllers, and
deliver the precision performance and reliability you expect
from Wavelength Electronics.
PTC Series controllers are found in such diverse
applications as particle and droplet measurement,
communications, manufacturing test, and medical systems.
POWERFUL AND EASY TO USE
The PTC controllers operate from a single power supply
between 5 V and 30 V, and two models drive ±5 A or ±10 A
to a Peltier thermoelectric cooler or a resistive heater.
These controllers mount directly to your circuit board.
PTC controllers interface with a variety of temperature
sensors, and the bias current is adjustable in order to
maximize controller sensitivity and stability for your
application.
You can use the PTCEVAL board to quickly configure the
PTC controller for prototyping. Using the same controller
for development and production helps guarantee there are
no surprises when it’s time to integrate the final design.
FEATURES AND BENEFITS
• Drive ±5 or ±10 A of TEC or heater current
• Single supply operation: 5 to 30 VDC
• Small package: 2.32” x 2.15” x 3.85”
• Remote Output Enable and
Temperature Setpoint controls
• Short term stability of 0.0012°C (off-ambient)
• Long term stability 0.002°C
• Selectable sensor bias current
• Adjustable current limit
• PI Control with “Smart Integrator”
• Failsafe Setpoint default in case of remote
temperature setpoint signal error
CONTENTS
QUICK CONNECT GUIDE 2
PIN DESCRIPTIONS 3
ELECTRICAL SPECIFICATIONS 4
SAFETY INFORMATION 5
OPERATING INSTRUCTIONS 6
OPERATING WITH THE PTCEVAL BOARD 10
ADDITIONAL TECHNICAL INFORMATION 11
TROUBLESHOOTING 13
MECHANICAL SPECIFICATIONS 15
PTCEVAL EVAL BOARD DIMENSIONS & SCHEMATIC 16
CERTIFICATION AND WARRANTY 17
e
Pb
RoHS
Compliant
PAGE
406-587-4910
www.teamWavelength.com
PTC5000/PTC10000
PCB-Mount Temperature Controllers
DATASHEET AND OPERATING GUIDE

© 2013 www.teamWavelength.com 2
PTC5000 / PTC10000 / PTCEVAL
QUICK CONNECT GUIDE
!
TOENSURE SAFE OPERATION OF THE PTC CONTROLLER, IT
IS IMPERATIVE THAT YOU DETERMINE THAT THE UNIT WILL BE
OPERATING WITHIN THE INTERNAL HEAT DISSIPATION SAFE
OPERATING AREA (SOA).
Go to the Wavelength Electronics website for the most accurate,
up-to-date, and easy to use SOA calculator:
http://www.teamwavelength.com/support/calculator/soa/soatc.php
http://www.teamwavelength.com/support/calculator/soa/soatc.php
If the power supply voltage is above 5 VDC it is critical to verify
that the PTC will be operating within the Safe Operating Area
before proceeding with setup and configuration.
Figure 1 is the Quick Connect schematic for TEC operation
using a Negative Temperature Coefficient sensor; this is the most
common mode of operation for the PTC controllers.
Additional wiring diagrams are found in Wire the PTC
Temperature Controller on page 8.
12
11
10
9
8
7
6
5
4
3
2
*1
Ext TEMP SET
COMMON
SENSOR+
SENSOR GND
V+
PGND
TEC+
TEC-
ENABLE
COMMON
ActT Mon
SetT Mon
TTL-Compatible
Enable = HI
(Optional Input)
DVM
Note: Current flows from TEC+ to TEC-. Connect the
TEC+ lead to pin 6, and the TEC- lead to pin 5. Keep the
wires as short as possible to reduce the voltage drop at
high current.
Use caution when the PTC is combined with a PLD laser
driver: if the TEC or thermistor is connected to the laser
diode, two power supplies are required and must float
independently of each other.
* Pin 1 is the pin farthest from the fan.
Thermistor
See Note
V
V+ = 5 to 30 VDC
-
+
-
+
Optional External Setpoint
- +
Figure 1. Basic Wiring Diagram, TEC Operation
Figure 2 is a top view of the PTC, illustrating the onboard switches
and trimpots. Additional information is found in Preconfiguration
on page 7.
Sensor Bias Current Switches (Left = On)
External / Onboard Setpoint (Left = External)
Remote / Local Output Enable (Right = Remote)
Output Enabled LED (Green = On)
Current Limit (% of Full Scale, 3/4-turn)
Onboard Temp. Setpoint Adjust (12-turn)
Proportional Term Adjust (3/4-turn)
TEMPERATURE
CONTROLLER
OUTPUT
ENABLED
LIMIT
TEMP SET
PGAIN
10 μA
100 μA
1 mA
10 mA
Ext TEMP SET
LOCAL
ENABLE
40
0
20
40
30
40
0
100
PTC SERIES
40
T
0
Figure 2. PTC Top View
For setup and configuration, we recommend using a test load in
place of the TEC or resistive heater, connected directly to pins 5
and 6 on the controller. Recommended test loads:
• For PTC5000, MP9100-1.00-1%. This resistor must be
attached to a heatsink.
• For PTC10000, MP9100-0.50-1%. This resistor must be
attached to a heatsink.
We also recommend using a test circuit to simulate a thermistor.
Figure 3 shows a simple adjustable test circuit.
R1
R2
R1 = 9.1 kΩ, ¼ W resistor
R2 = Multiturn trimpot, 2.2 kΩ
10
9
RLOAD Recommendation
0 to 5 A: MP9100-1.00-1%
0 to 10 A: MP9100-0.50-1%
Resistor must be attached to
a heatink. See Mfg datasheet.
RLOAD
5
6
TEC
Test Load
10 kΩ Thermistor
Test Load
Figure 3. TEC Test Load & Thermistor Simulator Test Circuit

© 2013 www.teamWavelength.com 3
PTC5000 / PTC10000 / PTCEVAL
PIN DESCRIPTIONS
Table 1. Pin Descriptions
PIN NAME DESCRIPTION
1 SetT MON Temperature setpoint voltage monitor. Refer to the Electrical Specifications for the voltage range.
Impedance 1 kΩ.
2 ActT MON Actual temperature sensor voltage monitor. Range 0 to 6 V. When the temperature is stabilized at
the setpoint the ActT MON voltage will match the voltage at pin 1 (SetT MON). Impedance 1 kΩ.
3 COMMON Common reference ground for low-current signals. Used with the monitor outputs (pins 1 & 2) and
the ENABLE input (pin 4). Do not use for high current return.
4 ENABLE
Remote Enable. Can be controlled using a switch or TTL-compatible input signal where
Disable = LO (< 1.45 V). Enable = HI (> 3.4 V). The Enable state between 1.45 V and 3.4 V is
indeterminate. Max voltage range is zero to VS. Damage threshold is 30 V.
5 TEC– Negative side of TEC. This pin sinks the current from the TEC (when using NTC sensors).
6 TEC+
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 PGND Power supply ground. This is the only ground connection designed as a high current return.
8 V+ or VS
Power supply input, 5 – 30 VDC. The power supply must be rated to source at least 1.5-times the
load current plus the PTC quiescent current. Reference the Safe Operating Area calculator if VSis
greater than 5 VDC.
9 SENSOR GND Ground connection for the temperature sensor (pin 10). Refer to the Specifications table for input
voltage range. Do not use for high current return.
10 SENSOR+ Positive side of temperature sensor. Bias current is driven from SENSOR+ to SENSOR GND.
11 COMMON Reference ground for the Ext TEMP SET input signal (pin 12).
12 Ext TEMP SET
External Temperature Setpoint voltage. Used for external voltage control of the temperature
setpoint. Impedance 1 kΩ. The switch on the controller top panel must be properly configured for this
input to be recognized. The Ext TEMP SET voltage does not sum with the onboard trimpot setting.
Damage threshold 7.2 V. If the signal falls below 0.3 V the setpoint will default to 1 V (contact factory
for alternate default settings). To reset the default safety circuit, the Ext TEMP SET voltage must be
> 0.4 V.
Table 2. Control and Monitor Transfer Functions
FUNCTION TRANSFER
FUNCTION DESCRIPTION
Ext TEMP SET 1 V / V The controller will drive the TEC or heater in order to make the voltage across the
temperature sensor match the Ext TEMP SET voltage.
SetT MON 1 V / V The setpoint temperature monitor voltage matches the setpoint voltage set by the
onboard trimpot or the external setpoint input to pin 12.
ActT MON 1 V / V The actual temperature monitor voltage matches the voltage drop across the
temperature sensor.
Table 3. PTCEVAL Input Voltage Protection Circuit
CONDITION PROTECTION CIRCUIT
ACTIVATION VOLTAGE
TO RESET THE
PROTECTION CIRCUIT
Undervoltage VS< 4.8 VDC set VS> 5.2 VDC
Overvoltage VS> 30.4 VDC set VS< 28.8 VDC

© 2013 www.teamWavelength.com 4
PTC5000 / PTC10000 / PTCEVAL
ELECTRICAL SPECIFICATIONS
PARAMETER SYMBOL PTC5000 PTC10000 UNIT NOTE
ABSOLUTE MAXIMUM RATINGS
Supply Voltage1VSor V+ 5 to 30 VDC
Internal Power Dissipation PMAX 110 W derating begins at 25ºC
Case Operating Temperature -40 to 85 ºC
Case Storage Temperature -65 to 125 ºC
Weight 11.3 oz 320.4 g
Size 3.85 x 2.15 x 2.32 inches 97.7 x 54.7 x 58.9 mm
OUTPUT CURRENT
Max Output Current IMAX ±5 ±10 A VS> 5.2 VDC
Output Current Limit ILIM Symmetrically applied to heat and cool current
Minimum Compliance Voltage VCOMP VS– 1.7 VS– 3 V VS> 5.2 VDC
Maximum Compliance Voltage VCOMP 28.3 27 V
Short Term Stability, 1 hr, Off ambient 1< 0.0012 ºC
using 10 kΩthermistor with
100 μA bias current at 25ºC.
Short Term Stability, 1 hr, On ambient 1< 0.0014 ºC
Long Term Stability, 24 hr, Off ambient 1< 0.002 ºC
Temperature Coefficient < 100 ppm / ºC
POWER SUPPLY
Power Supply Voltage2VSor V+ 5 to 30 VDC
Quiescent Current 220 mA
Minimum Current Rating 1.1 * (ITEC + Quiescent Current) A
TEMPERATURE SENSORS
Sensor Compatibility Thermistor, RTD,
IC Sensors
Sensor Input Voltage Range 0 to (VS– 1.5)
0 to 5.5 VVS< 7 VDC VS= 7 to 30 VDC
Sensor Input Damage Threshold 5.5 V
BIAS CURRENT
Bias Current Selection 10 μA, 100μA,
1 mA, 10 mA
Bias Current Accuracy ±0.2% ±0.5% over full temperature range
Bias Current Temperature Coefficient 25
10 ppm / ºC VS< 7.5 VDC
VS> 7.5 VDC
EXTERNAL SETPOINT AND MONITORS
External Setpoint Voltage Range
(Ext TEMP SET)
0 to 5
0 to 6.2 VVS< 7 VDC VS= 7 to 30 VDC
External Setpoint Damage Threshold < -0.5 or > 7.2 V
SetT MON Output Voltage Range 0 to 6.2 V VS= 7 to 30 VDC
ActT MON Output Voltage Range 0 to 6 V VS= 7 to 30 VDC
Sensor Voltage to
Act T MON Accuracy 1mV
Set T MON to Act T MON Accuracy 1 mV
FEEDBACK LOOP
Proportional Gain Range 5 to 40 A / V
Integrator Time Constant 1.5 1.8 A / V-s can be changed at factory
1 When using resistive heaters, stability can only be consistently achieved when specified temperatures are 10°C or more above ambient.
2 The PTCEVAL is equipped with over-, under-, and reverse-voltage protection.

© 2013 www.teamWavelength.com 5
PTC5000 / PTC10000 / PTCEVAL
THEORY OF OPERATION
The PTC5000 and PTC10000 are high-current linear
temperature controllers that deliver bidirectional current to
Peltier Effect thermoelectric coolers, or unidirectional current to
resistive heaters.
The fundamental operating principle is that the controller
adjusts the TEC drive current in order to change the
temperature of the sensor that is connected to the thermal load.
The goal is to make the voltage across the sensor match the
setpoint voltage, and then keep them equal in spite of changes
to ambient conditions and variations in thermal load.
The controller measures the load temperature by driving a
current through the temperature sensor and measuring the
voltage drop across it. It may be useful to remember that you
do not directly adjust the setpoint temperature. Rather, you
adjust a voltage signal that represents the sensor voltage at the
desired temperature setpoint.
While the output is enabled the controller continuously
compares the setpoint voltage and the actual sensor voltage.
If there is a difference between the two signals the controller
adjusts the output current—thereby driving the TEC or heater
to change temperature—until the difference is zero.
Once the actual sensor voltage equals the setpoint voltage,
the controller makes minor adjustments to the output current in
order to keep the difference at zero. If the ambient temperature
changes, for example, the controller will adjust the drive current
accordingly.
The controller includes features that help protect the load
from damage, and also make it more versatile in a wide array
of applications. These features are explained in detail in
Operating Instructions on page 6.
• Current limit: the adjustable current limit must be set
correctly in order to avoid over-driving and damaging the
TEC or heater.
• External and Onboard temperature setpoint control:
for prototyping and benchtop applications the temperature
setpoint can be adjusted with the onboard trimpot. When
the controller is integrated into an automated control
system, the temperature setpoint can be adjusted by
external voltage signal.
• Remote Enable and Local Enable: the controller can be
configured to use a remote signal to enable the output,
or it can be configured so that the output is always on
whenever power is applied to the unit.
• Control loop: the controller employs a smart Proportional-
Integrating control loop to adjust the drive current. The
proportional term is user-adjustable, and when properly
configured will quickly settle the load to temperature with
minimal overshoot and ringing.
SAFETY INFORMATION
SAFE OPERATING AREA — DO NOT EXCEED
INTERNAL POWER DISSIPATION LIMITS
Before attempting to operate the PTC, it is imperative that you
first determine that the unit will operate within the Safe Operating
Area (SOA). Operating the unit outside of the SOA may damage
the controller or the load. Operating outside of the SOA will void
the warranty.
Go to the Wavelength Electronics website for the most accurate,
up-to-date, and easy to use SOA calculator:
h
h
ttp://www.teamwavelength.com/support/calculator/soa/soatc.php
ttp://www.teamwavelength.com/support/calculator/soa/soatc.php
!
TOENSURE SAFE OPERATION OF THE PTC CONTROLLER, IT
IS IMPERATIVE THAT YOU DETERMINE IF THE UNIT IS GOING TO
BE OPERATING WITHIN THE INTERNAL HEAT DISSIPATION SAFE
OPERATING AREA (SOA).

© 2013 www.teamWavelength.com 6
PTC5000 / PTC10000 / PTCEVAL
OPERATING INSTRUCTIONS
The PTC requires minimal external electronics. If you are using
the module on the benchtop or for prototyping your control
system, we recommend the PTCEVAL board.
This chapter is divided into two sections:
• The Preconfiguration section
»Onboard Adjustments and Controls
»Set the Sensor Bias Current
»Choose External vs. Onboard Setpoint
»Choose Remote vs. Local Enable
»Calculate the Temperature Setpoint Voltage
»Understand the Proportional Gain Term
»Wire the PTC Temperature Controller
• Instructions to operate the PTC with the PTCEVAL evaluation
board.
NECESSARY EQUIPMENT
The following equipment is the minimum necessary to configure
the PTC for basic operation:
• PTC controller, PTCEVAL evaluation board (recommended)
• Digital multimeter, 4-½ digit resolution recommended
• Power supply, 5 – 30 VDC, current rated for at least 1.5-times
the TEC current plus PTC quiescent current. Connect via
the terminal strip on the PTCEVAL, or can be terminated
with 2.5 mm two-conductor plug such as Wavelength part
PWRPAK-5V.
• Thermistor or other temperature sensor
• Peltier-type thermoelectric module, or resistive heater
• Heatsink for the temperature-controlled load, mounting
hardware, thermal washers or paste
• Connecting wires
SAFE OPERATING AREA AND
THERMAL DESIGN CONSIDERATIONS
To determine if the PTC controller is suitable for your application
and if it will be operating in the safe range, consult the instructions
for calculating the Safe Operating Area online at
http://www.teamwavelength.com/support/calculator/soa/soatc.php
http://www.teamwavelength.com/support/calculator/soa/soatc.php
If you have any questions about the Safe Operating Area
calculator, call the factory for free and prompt technical
assistance.
!
ITIS 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 PTC AND/OR LOAD.
When you assemble and mount the TEC (or heater), heatsink,
and temperature sensor, make sure the physical connections
between the components are solid. We recommend using thermal
paste or thermal washers at the load/TEC and TEC/heatsink
interfaces. The thermistor must be in firm contact with the load in
order to achieve stable and reliable temperature control.
PREVENT DAMAGE FROM ELECTROSTATIC
DISCHARGE
Before proceeding, it is critical that you take precautions to
prevent electrostatic discharge (ESD) damage to the driver
and your load. ESD damage can result from improper handling
of sensitive electronics, and is easily preventable with simple
precautions. Reference this website for information on ESD
best-practices:
http://eed.gsfc.nasa.gov/562/ESD_BestPractices.htm
http://eed.gsfc.nasa.gov/562/ESD_BestPractices.htm
We recommend that you always observe ESD precautions
when handing the PTC controller.

© 2013 www.teamWavelength.com 7
PTC5000 / PTC10000 / PTCEVAL
PRECONFIGURATION
ONBOARD ADJUSTMENTS AND CONTROLS
Onboard controls are accessed on the top panel of the PTC and
must be set according to the operation mode. The controls are
illustrated in Figure 4.
Sensor Bias Current Switches (Left = On)
External / Onboard Setpoint (Left = External)
Remote / Local Output Enable (Right = Remote)
Output Enabled LED (Green = On)
Current Limit (% of Full Scale, 3/4-turn)
Onboard Temp. Setpoint Adjust (12-turn)
Proportional Term Adjust (3/4-turn)
TEMPERATURE
CONTROLLER
OUTPUT
ENABLED
LIMIT
TEMP SET
PGAIN
10 μA
100 μA
1 mA
10 mA
Ext TEMP SET
LOCAL
ENABLE
40
0
20
40
30
40
0
100
PTC SERIES
40
T
0
Figure 4. PTC Top View
SET THE SENSOR BIAS CURRENT
Choosing the right thermistor resistance range and bias current
is important to optimize performance of your temperature control
system. Table 4 shows the resistance at 25°C of six thermistors
that are available from Wavelength Electronics.
Four DIP switches are used to set the bias current driven to the
temperature sensor.
• Set the sensor bias current by sliding the appropriate switch
to the left (ON) position. All other bias current switches must
remain in the right (OFF) position.
• For AD590 temperature sensors, all sensor bias switches
must remain in the right (OFF) position.
• If you are using a 10 kΩthermistor, set the 100 μA switch to
the left (ON) and leave the others to the right (OFF).
• If multiple switches are ON, the bias currents are additive.
Table 4. Temperature Ranges of Common Thermistors
THERMISTOR
MODEL NO.
R @
25ºC 10 μA 100 μA
TCS605 5 kΩ-55 to 2°C -20 to 33°C
TCS610,
TCS10K5
10 kΩ-45 to 13°C -8 to 50°C
TCS620 20 kΩ-35 to 28°C 6 to 69°C
TCS650 50 kΩ-18 to 49°C 25 to 92°C
TCS651 100 kΩ-6 to 67°C 41 to 114°C
CHOOSE EXTERNAL VS. ONBOARD SETPOINT
The PTC includes a 12-turn trimpot for onboard temperature
setpoint control, or you can use an external signal.
• External Setpoint. Set the Ext TEMP SET switch on the
top of the unit to the left (EXTERNAL).
• Onboard Setpoint. Set the Ext TEMP SET switch on the
top of the unit to the right (ONBOARD).
CHOOSE REMOTE VS. LOCAL ENABLE
The PTC output can be enabled either remotely or set to an
always-on state. Set the unit for Remote Enable during setup
and configuration.
• Remote Enable
»Set the LOCAL ENABLE switch on the top of the unit to
the right (REMOTE).
»To enable the output, apply a TTL-High signal to pin 4
(High = 3.4 V or greater). To disable the output, the
signal on pin 4 must be less than 1.45 V.
• Local Enable
»Set the LOCAL ENABLE switch to the left (LOCAL).
»Be advised that the output current will be enabled at all
times while there is power to the unit.
CALCULATE THE TEMPERATURE SETPOINT
VOLTAGE
The actual temperature in degrees is not set directly on the
PTC unit. Instead, the temperature is controlled by a voltage
signal equal to the voltage drop across the sensor at the
desired temperature setpoint. Calculate the temperature
setpoint voltage as follows:
• Refer to the resistance vs. temperature table for your
thermistor or RTD and find the resistance at the desired
temperature. If you are using an AD590 or LM335, refer to
the datasheet for the temperature transfer function.
• Calculate the sensor voltage drop at the desired
setpoint temperature. This is the setpoint voltage value
on SetT MON:
»Thermistor and RTD:
V
SETPOINT = IBIAS * RTHERMISTOR
»LM335 and AD590:
V
SETPOINT = 2.730 + (0.010 * TSETPOINT)
UNDERSTAND THE PROPORTIONAL GAIN TERM
The gain value is factory-set to a common starting place that is
suitable for a wide range of thermal loads. Once the controller
is operating under normal conditions, the gain term can be
tuned for faster settling with minimal overshoot and ringing.
Refer to TN-TC01 - Optimizing Thermoelectric Temperature
Control Systems for details about setting the proportional gain
term.

© 2013 www.teamWavelength.com 8
PTC5000 / PTC10000 / PTCEVAL
WIRE THE PTC TEMPERATURE CONTROLLER
Refer to Table 5 to determine which configuration applies to
your application, and then reference the associated figure for
wiring instructions.
Refer to Table 1. Pin Descriptions on page 3 for complete
information on the pin functions and operating parameters.
Refer to Figure 3 for load and thermistor test circuit
recommendations.
Table 5. Wiring Configurations
CONFIGURATION DIAGRAM
TEC with Negative Temperature
Coefficient (NTC) Sensor Figure 5
Heater with Negative Temperature
Coefficient (NTC) Sensor Figure 6
Heater with Positive Temperature
Coefficient (PTC) Sensor Figure 7
TEC with Positive Temperature
Coefficient (PTC) Sensor
(AD590, LM335, RTD)
Figure 8
12
11
10
9
8
7
6
5
4
3
2
*1
Ext TEMP SET
COMMON
SENSOR+
SENSOR GND
V+
PGND
TEC+
TEC-
ENABLE
COMMON
ActT Mon
SetT Mon
TTL-Compatible
Enable = HI
(Optional Input)
DVM
Note: Current flows from TEC+ to TEC-. Connect the
TEC+ lead to pin 6, and the TEC- lead to pin 5. Keep the
wires as short as possible to reduce the voltage drop at
high current.
Use caution when the PTC is combined with a PLD laser
driver: if the TEC or thermistor is connected to the laser
diode, two power supplies are required and must float
independently of each other.
* Pin 1 is the pin farthest from the fan.
Thermistor
See Note
V
V+ = 5 to 30 VDC
-
+
-
+
Optional External Setpoint
- +
Figure 5. Wiring Diagram for TEC Operating with
Negative Temperature Coefficient Sensor
TTL-Compatible
Enable = HI
(Optional Input)
DVM
-
+
Optional External Setpoint
V
V+ = 5 to 30 VDC
Keep the wires to the heater as short as possible to reduce
the voltage drop at high current.
Use caution when the PTC is combined with a PLD laser
driver: if the heater or thermistor is connected to the laser
diode, two power supplies are required and must float inde-
pendently of each other.
* Pin 1 is the pin farthest from the fan.
NTC Sensor
Heater
-
+
12
11
10
9
8
7
6
5
4
3
2
*1
Ext TEMP SET
COMMON
SENSOR+
SENSOR GND
V+
PGND
TEC+
TEC-
ENABLE
COMMON
ActT Mon
SetT Mon
Figure 6. Wiring Diagram for Heater and
Negative Temperature Coefficient Sensor
TTL-Compatible
Enable = HI
(Optional Input)
DVM
-
+
Optional External Setpoint
V
Keep the wires to the heater as short as possible to reduce
the voltage drop at high current.
Use caution when the PTC is combined with a PLD laser
driver: if the heater or thermistor is connected to the laser
diode, two power supplies are required and must float inde-
pendently of each other.
* Pin 1 is the pin farthest from the fan.
PTC Sensor
Heater
V+ = 5 to 30 VDC
-
+
12
11
10
9
8
7
6
5
4
3
2
* 1
Ext TEMP SET
COMMON
SENSOR+
SENSOR GND
V+
PGND
TEC+
TEC-
ENABLE
COMMON
ActT Mon
SetT Mon
Figure 7. Wiring Diagram for Heater
and Positive Temperature Coefficient Sensor

© 2013 www.teamWavelength.com 9
PTC5000 / PTC10000 / PTCEVAL
TTL-Compatible
Enable = HI
(Optional Input)
DVM
-
+
Optional External
Setpoint
See Note
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* Pin 1 is the pin farthest from the fan.
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ActT Mon
SetT Mon
Figure 8. TEC with Positive Temperature Coefficient Sensor
(AD590, LM335 or RTD)

© 2013 www.teamWavelength.com 10
PTC5000 / PTC10000 / PTCEVAL
OPERATING WITH THE PTCEVAL
BOARD
Reference Figure 9 for switch and control locations on the
PTCEVAL board, and configure the evaluation board as follows:
• Set the POWER switch to OFF
• Set the OUTPUT switch to DISABLE
• Set the MONITOR switch to SET T
• If you are using an AD590 sensor, set the sensor jumper to
cover the right two pins. The jumper places a 10 kΩresistor
in the circuit (see Figure 18 for the PTCEVAL schematic).
For all other temperature sensors, leave the jumper covering
the left two pins.
Test Point
MONITOR +
COMMON
Monitor
SET T
ACT T
Output
Current
ENABLE
DISABLE
Power
ON OFF
2.5mm Power
Input Jack
OTHER AD590
Sensor Jumper
OTHER AD590
Thermistor,
RTD, LM335
AD590
Sensors Only
TEMPERATURE
CONTROLLER
OUTPUT
ENABLED
LIMIT
TEMP SET
PGAIN
10 μA
100 μA
1 mA
10 mA
Ext TEMP SET
LOCAL
ENABLE
40
020
4030
40
0
100
PTC SERIES
40
T
0
OTHER AD590
SET T MONITOR
ACT T MONITOR
GND - COMMON
ENABLE
TEC -
TEC +
GND - POWER
V+
SENSOR GND
SENSOR +
GND - COMMON
EXTERNAL TEMP SET
Figure 9. PTCEVAL Top View
On the PTC unit set the following parameters:
• Set the LOCAL ENABLE switch to the right (REMOTE)
• Turn the current limit trimpot to zero (fully counter-clockwise)
and then clockwise to set the limit current as a percentage of
full-scale output. The limit current should be set at or below
the value recommended by the TEC manufacturer. The limit
can be more precisely set by monitoring a voltage test point
on the circuit board; refer to Setting the Current Limit More
Accurately on page 11.
Place the PTC unit on the evaluation board. Hold the PTC in
place and turn the evaluation board over. Insert the two screws
through the small holes in the printed circuit board and tighten.
Solder the PTC pins to the PTCEVAL board.
Switch on the power supply; set the evaluation board POWER
switch to ON.
Set the setpoint temperature voltage with the onboard trimpot:
• Connect a voltmeter across the MONITOR and COMMON
test points on the upper right edge of board. The test point
sockets accept a standard 2 mm multimeter probe tip.
• Adjust the TEMP SET trimpot on the PTC unit until the
displayed voltage matches the setpoint voltage calculated
above. Turn the trimpot to the right to increase the setpoint
voltage, left to decrease.
• The temperature can also be set externally by applying a
signal to pin 12. Refer to External Temperature Setpoint
Input on page 11.
Set the Monitor switch to ACT T to monitor the actual sensor
voltage on the multimeter.
Enable the output using the switch on the evaluation board.
The OUTPUT ENABLED LED on the PTC will illuminate green
when the output is on.
The voltage displayed on the DVM should begin to approach
temperature setpoint voltage. If the actual sensor voltage is not
approaching the sensor setpoint voltage, disable the output
and reference Troubleshooting on page 13.
Once you understand how the controller works in your
system, adjust the gain term to optimize temperature settling
performance.
Once proper operation is verified, disable the output and set
the POWER switch to OFF.
PTCEVAL INPUT VOLTAGE PROTECTION
The PTCEVAL board is equipped with a circuit to protect the
PTC unit from over-, under-, and reverse-voltage conditions.
Refer to Table 3 for details on the protection circuit activation
and reset voltage levels.

© 2013 www.teamWavelength.com 11
PTC5000 / PTC10000 / PTCEVAL
ADDITIONAL TECHNICAL
INFORMATION
This section includes useful technical information on these topics:
• Setting the Current Limit More Accurately
• Remotely Setting the Current Limit
• “External Temperature Setpoint Input”
• “Product Variations”
• Safe Operating Area Calculation
SETTING THE CURRENT LIMIT MORE ACCURATELY
The current limit can be more accurately set using a voltmeter
to monitor an internal test point while the trimpot is adjusted.
The test point is accessible from the open end of the unit, and
is a small hoop of metal soldered to the circuit board. Figure 10
shows the location of the internal test point.
Figure 10. Internal Test Point
Connect the positive lead of a voltmeter to the test point; we
recommend the clamping-type voltmeter probe. Connect the
negative probe to COMMON (pin 3).
Switch on power to the PTC, and enable the output.
Calculate the voltage that corresponds to the required current
limit.
The transfer function is 0.2 V / A for the PTC5000 and 0.1 V / A
for the PTC10000.
VLIMIT = ILIMIT * Transfer Function
Adjust the LIMIT trimpot on the top of the PTC until the voltmeter
displays the desired VLIMIT value.
REMOTELY SETTING THE CURRENT LIMIT
The current limit can be set remotely by wiring to an internal via
and applying a voltage signal. We recommend that this feature is
used only when necessary, and only by experienced electronics
users.
Contact the factory for information on how to configure the unit to
accept remote current limit signals.
EXTERNAL TEMPERATURE SETPOINT INPUT
Pin 12 of the PTC is the Ext TEMP SET input, and is used to
set the temperature setpoint remotely. The input voltage range is
determined by the supply voltage (see Electrical Specifications
on page 4) and the damage threshold is 7.2 V.
The PTC must be configured to reference the Ext TEMP SET pin;
refer to Choose External vs. Onboard Setpoint on page 6.
The signal can be directly input from a benchtop power supply, or
a variable resistor divider network can be employed. Figure 11
illlustrates an example circuit.
R1
R2D1
V
S
V
S
= Supply voltage (5 to 30 V)
D1 = Bandgap reference* (LM4040)
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Figure 11. Ext TEMP SET example circuit
PRODUCT VARIATIONS
We design and manufacture our products in-house, and that
gives us the unique ability to modify our drivers and controllers
to suit exactly your application. Our Product Variation service
allows us to quickly and cost-effectively address your design
requests, from prototype quantities to long-term high-volume
manufacturing.
Examples of past Product Variations include:
• Replacing trimpots (current limit, setpoint, PGAIN) with
fixed-value resistors to maximize long-term stabilty in an
OEM laser controller system
• Optimizing heatsink size and configuration to fit within the
space constraints of your electronics chassis
• Increasing the maximum output current

© 2013 www.teamWavelength.com 12
PTC5000 / PTC10000 / PTCEVAL
SAFE OPERATING AREA CALCULATION
The Safe Operating Area of the PTC is a determined by the
amount of power that can be dissipated within the output stage of
the controller. If that power limit is exceeded permanent damage
can result.
Refer to the Wavelength Electronics website for the most up-to-
date SOA calculator for our products. The online tool is fast and
easy to use, and also takes into consideration ambient operating
temperature.
http://www.teamwavelength.com/support/calculator/soa/soatc.php
!
DONOT OPERATE THE UNIT OUTSIDE THE SAFE
OPERATING AREA CURVE.
OPERATING THE PTC OUTSIDE OF THE SOA VOIDS THE
WARRANTY.
Follow these steps to use the SOA Chart to determine if the
PTC will be operating safely. Refer to the example SOA chart in
Figure 12. Actual SOA charts for the PTC5000 and PTC10000
are shown in Figure 13 and Figure 14.
• Determine the VSsupply voltage for the PTC controller. For
this example assume VS= 20 VDC.
• Refer to the TEC datasheet to find the maximum voltage
(VMAX) and current (IMAX) specifications. For this example,
assume VMAX = 15 V and IMAX = 8.5 A.
• Calculate the voltage drop across the controller:
V
DROP = VS- VMAX
• Mark VDROP on the X-axis, and extend a line upward
• Mark IMAX on the Y-axis, and extend a line to the right until it
intersects the VDROP line
• On the X-axis, mark the supply voltage (VS)
• Extend a diagonal line from VSto the intersection of the VDROP
and IMAX lines; this is the Load Line
• If the Load Line crosses the Safe Operating Area line at any
point, the configuration is not safe.
If the SOA calculator indicates the PTC will be outside of the Safe
Operating Area, the system must be changed so that the Load
Line lies completely within the Safe Operating Area.
In order to shift the load line to the left, the circuit must be
changed so that less power is dissipated within the controller.
This is accomplished by reducing the total power dissipation of
the entire circuit, or by changing the load so that it dissipates
more power.
There are several ways to reconfigure the system to reduce
power dissipation in the controller:
• Reduce the supply voltage (VS)
• Increase the load impedance
• Reduce the current limit
After changing any of the parameters, recalculate the SOA to
make sure the controller will operate safely. If you have questions,
or run into difficulties calculating the SOA, contact Wavelength
Electronics for assistance.
0.0 5.0 10.0 15.0 20.0 25.0 30.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Voltage (V)
Current (A)
2.5 7.5 12.5 17.5 22.5 27.5
VDROP
IMAX
VS
Load Line
Figure 12. Example SOA Chart
0.0 5.0 10.0 15.0 20.0 25.0 30.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Volta
g
e
(
V
)
Current (A)
2.5 7.5 12.5 17.5 22.5 27.5
Figure 13. SOA Chart, PTC5000
0.0 5.0 10.0 15.0 20.0 25.0 30.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Voltage (V)
Current (A)
2.5 7.5 12.5 17.5 22.5 27.5
Figure 14. SOA Chart, PTC10000

© 2013 www.teamWavelength.com 13
PTC5000 / PTC10000 / PTCEVAL
TROUBLESHOOTING
PROBLEM POTENTIAL CAUSES SOLUTIONS
Output will not enable
–OR–
Output will not disable
Improperly configured
REMOTE switch on the PTC
unit
• If you are using the evaluation board, make sure that the
REMOTE switch on the top of the PTC unit is set to the
right position. Then use the Enable/Disable switch on the
evaluation board to control the output.
• If you are using the PTC unit stand-alone, and are not
using the REMOTE ENABLE input (pin 4), then the
REMOTE switch should be set to the left position. Keep in
mind that in this state the output will be enabled as soon
as power is applied to the PTC unit.
Remote Enable signal is not
correct
If you are using the PTC unit stand-alone and are using the
REMOTE ENABLE input (pin 4), make sure that the TTL-
compatible signal is correctly configured (< 1.45 V = Output
Disable; > 3.4 V = Output Enable).
Temperature is
decreasing when it
should be increasing
–OR–
Temperature is increasing
when it should be
decreasing
The TEC may be connected
backwards to the PTC
The convention is that the red wire on the TEC module
connects to TEC+ (pin 6) and the black wire to TEC- (pin 5).
If your TEC is connected in this manner and the problem
persists, the TEC module itself may be wired in reverse.
Switch off power to the system, reverse the connections to the
PTC, and then try again to operate the system.
TEC wiring polarity is dependent on temperature sensor type
(NTC vs. PTC). Verify that the polarity is correct for the sensor
type you are using (see Table 5. Wiring Configurations on
page 8).
Temperature increases
beyond the setpoint and
will not come down
The heatsink may be
inadequately sized to
dissipate the heat from
the load and TEC module,
and now the system is in
a condition called thermal
runaway
• Increase the size of the heatsink, add a fan to blow
air over the heatsink, and/or reduce the ambient air
temperature around the heatsink.
• Apply a thin layer of thermal paste or use thermal washers
between the load, the TEC surfaces, and the heatsink.
The TEC and heatsink are
not adequately sized for the
thermal load
The heat being generated by the load may be too great for the
TEC to pump to the heatsink; a larger TEC may be needed.
Consult our technical note TN-TC01 at
http://www.teamwavelength.com/downloads/notes/tn-tc01.pdf
Temperature does not
stabilize very well at the
setpoint
Poor thermal contact between
components of the thermal
load
Use thermal paste or washers between the load/TEC and
TEC/heatsink interfaces. Make sure the temperature sensor is
in good thermal contact with the load.
Unit is operating outside
of the ideal region of the
temperature sensor
The sensor type and bias current should be selected to
maximize sensitivity at the target temperature. Thermistors
provide the best performance, particularly for applications
where a single setpoint temperature must be accurately
maintained. For example, at 25°C a 10 kΩthermistor has a
sensitivity of 43 mV / °C, whereas an RTD sensor has a
sensitivity of 4 mV / °C.
Proportional control term is
set too high
Reduce the value of the proportional term. For more
information reference Wavelength’s technical note TN-TC01
at
http://www.teamwavelength.com/downloads/notes/tn-tc01.pdf
Continued

© 2013 www.teamWavelength.com 14
PTC5000 / PTC10000 / PTCEVAL
TROUBLESHOOTING, CONTINUED
PROBLEM POTENTIAL CAUSES SOLUTIONS
Temperature does not
reach the setpoint
Insufficient current driven to
the TEC or Heater
Increase the current limit - but DO NOT exceed the
specifications of the TEC or heater.
The controller does not have
sufficient compliance voltage
to drive the TEC or heater
Increase the power supply voltage; be certain to verify that the
controller is within the Safe Operating Area; the SOA calculator
is found at:
http://www.teamwavelength.com/support/calculator/soa/soatc.php
PTC does not respond
to external temperature
setpoint input
The Ext TEMP SET switch is
improperly configured
To configure the PTC to reference
the setpoint signal on pin 12, set the
Ext TEMP SET switch on the top of the unit to the Left.
The EXTERNAL TEMP SET
signal is below the minimum
signal value of 0.3 V
If the EXT TEMP SET signal falls below 0.3 V, the PTC
defaults to a “safe temperature” setpoint voltage of 1 V. The
actual safe temperature depends on the sensor and bias
current configuration. For a 10 kΩthermistor at 100 μA bias
current, the default temperature setpoint is 25°C. The safe
temperature setpoint voltage can be changed at the factory if
your application requires it.
PTCEVAL board not
functioning correctly;
PTCEVAL switches off
Input power supply voltage
out of range
Check that the input supply voltage is between
5 VDC and 30 VDC when the PTC is operating under high
current load.
• The under-voltage circuit switches off power to the PTC if
the input voltage falls below 4.8 VDC. To reset the under-
voltage circuit the input voltage must exceed 5.2 VDC.
• The over-voltage circuit switches off power to the
PTC if the input voltage exceeds 30.4 VDC. To reset
the over-voltage circuit the input voltage must be less
than 28.8 VDC.
POWER LED on
PTCEVAL blinking on
and off
Faulty input power supply Verify that the power supply is able to supply sufficient current
to the PTC and is not current limited.
Temperature is slow to
stabilize and is not within
the specifications
Setpoint temperature is
set close to the ambient
temperature
Set the temperature at least 10°C above ambient when using
a resistive heater. A resistive heater is unable to precisely
maintain temperatures near ambient because once the
temperature overshoots the setpoint, the controller turns off
and relies on ambient temperature to cool the load. If setting
the temperature 10°C or more above ambient is not possible,
then choose a thermoelectric controller, which can alternately
heat and cool the load to maintain a more precise setpoint
temperature.

© 2013 www.teamWavelength.com 15
PTC5000 / PTC10000 / PTCEVAL
MECHANICAL SPECIFICATIONS
DIMENSIONS - PTC5000 / PTC10000
92.74
3.65
58.88
2.32
5.08
0.200
[43.59]
1.716
[3.96]
0.156
TYP
23.88
0.940
10.72
0.42
[1.14] 0.045 SQUARE PIN
12 PLS
RECOMMENDED HOLE DIA
[1.70] 0.067 TYP
54.66
2.15
[5.08]
0.200
TEMPERATURE
CONTROLLER
OUTPUT
ENABLED
LIMIT
TEMP SET
PGAIN
10 μA
100 μA
1 mA
10 mA
Ext TEMP SET
LOCAL
ENABLE
40
020
4030
0
100
PTC SERIES
T
0
Dimensions are in
inches and [mm].
All dimensions have
5% tolerance.
HEATSINK
FAN
Pin 1
TOP VIEW PCB FOOTPRINT
[5.08]
0.200
[20.88]
0.822
[72.39]
2.850
[23.88]
0.940
[17.58]
0.692
[35.56]
1.400
2 PLS
RECOMMENDED HOLE DIA
[8.13] 0.320 TYP
2 PLS
RECOMMENDED HOLE DIA
[3.96] 0.156 TYP
[14.97]
0.590
[21.84]
0.860
Figure 15. PTC5000 / PTC10000 Dimensions
6-32 UNC-2B
2 PLS
35.56
1.40
3.480
0.137
27.46
1.08
26.04
1.03
20.88
0.822
RECOMMENDED
CLEARANCE HOLE
DIA. [3.9] 0.145 TYP
Figure 16. Bottom View, PTC Mounting Holes

© 2013 www.teamWavelength.com 16
PTC5000 / PTC10000 / PTCEVAL
PTCEVAL EVALUATION BOARD DIMENSIONS & SCHEMATIC
Figure 17. PTC Evaluation Board with PTC Unit Installed
60.60
2.39
15.88
0.63
[3.96]
0.156
TYP
[43.59]
1.716
9
0.35
[1.14]/0.045 SQUARE PIN
12 PLS
RECOMMENDED HOLE DIA.
[1.70]/0.067 TYP
129.54
5.10
5.08
0.20
139.70
5.50
91.44
3.60
5.08
0.20
101.60
4.00
43.20
1.70
55.88
2.20
TEMPERATURE CONTROLLER
OUTPUT ENABLED LIMIT TEMP SET PGAIN
10 μA 100 μA 1 mA 10 mA Ext TEMP SET LOCAL ENABLE
40
020
40
30
0
100
PTC SERIES
T
0
Dimensions are in [mm] and inches.
All dimensions have 5% tolerance.
VS
PGND
TEC+
TEC-
SENSOR+
SENSOR GND
ENABLE
COM
ActT Mon
SetT Mon
COM
EXT TEMP SET
SetT Mon
ActT Mon
COM
COM
ENABLE
EXT TEMP SET
SENSOR+
SENSOR GND
VS
PGND
TEC+
TEC-
ENABLE
DISABLE
1
2
3
4
5
6
7
8
9
10
11
12
TB1
TB12
MMBF4392
100 Ω
LED
1.0 kΩ
1
2
3
4
5
6
7
8
9
10
11
12
J1
Header - 12 pin
Enable Switch
10 kΩ
1 2 3
Jumper - 3 pin
10 kΩ for AD590
TP2
GND
TP1
Monitor
SET T
ACT T
Monitor Switch
When designing the circuit board to integrate
the PTC, make sure the power supply and
TEC traces are sized for high current.
Contact Wavelength Electronics for design
recommendations.
GND 1
PWR 2
P1
0.1μF
VS
100μF
Input Power
Protection
Circuits
ENABLE
DISABLE
Power Switch
Figure 18. PTC Eval Schematic

© 2013 www.teamWavelength.com 17
PTC5000 / PTC10000 / PTCEVAL
CERTIFICATION AND
WARRANTY
CERTIFICATION
Wavelength Electronics, Inc. (Wavelength) certifies that this
product met its published specifications at the time of shipment.
Wavelength further certifies that its calibration measurements
are traceable to the United States National Institute of Standards
and Technology, to the extent allowed by that organization’s
calibration facilities, and to the calibration facilities of other
International Standards Organization members.
WARRANTY
This Wavelength product is warranted against defects in
materials and workmanship for a period of one (1) year from
date of shipment. During the warranty period, Wavelength will,
at its option, either repair or replace products which prove to be
defective.
WARRANTY SERVICE
For warranty service or repair, this product must be returned
to the factory. An RMA is required for products returned to
Wavelength for warranty service. The Buyer shall prepay
shipping charges to Wavelength and Wavelength shall pay
shipping charges to return the product to the Buyer upon
determination of defective materials or workmanship. However,
the Buyer shall pay all shipping charges, duties, and taxes for
products returned to Wavelength from another country.
LIMITATIONS OF WARRANTY
The warranty shall not apply to defects resulting from improper
use or misuse of the product or operation outside published
specifications. No other warranty is expressed or implied.
Wavelength specifically disclaims the implied warranties of
merchantability and fitness for a particular purpose.
EXCLUSIVE REMEDIES
The remedies provided herein are the Buyer’s sole and exclusive
remedies. Wavelength shall not be liable for any direct, indirect,
special, incidental, or consequential damages, whether based on
contract, tort, or any other legal theory.
REVERSE ENGINEERING PROHIBITED
Buyer, End-User, or Third-Party Reseller are expressly prohibited
from reverse engineering, decompiling, or disassembling this
product.
NOTICE
The information contained in this document is subject to change
without notice. Wavelength will not be liable for errors contained
herein or for incidental or consequential damages in connection
with the furnishing, performance, or use of this material. No part
of this document may be translated to another language without
the prior written consent of Wavelength.
LIFE SUPPORT POLICY
This important safety information applies to all Wavelength
Electronics, Inc, electrical and electronic products and
accessories:
As a general policy, Wavelength Electronics, Inc. does not
recommend the use of any of its products in life support
applications where the failure or malfunction of the Wavelength
product can be reasonably expected to cause failure of the life
support device or to significantly affect its safety or effectiveness.
Wavelength will not knowingly sell its products for use in such
applications unless it receives written assurances satisfactory
to Wavelength that the risks of injury or damage have been
minimized, the customer assumes all such risks, and there is no
product liability for Wavelength. Examples of devices considered
to be life support devices are neonatal oxygen analyzers, nerve
stimulators (for any use), auto-transfusion devices, blood pumps,
defibrillators, arrhythmia detectors and alarms, pacemakers,
hemodialysis systems, peritoneal dialysis systems, ventilators of
all types, and infusion pumps as well as other devices designated
as “critical” by the FDA. The above are representative examples
only and are not intended to be conclusive or exclusive of any
other life support device.
REVISION HISTORY
REV. DATE CHANGE
A 20 Jan 2012 Release
B 3 Sep 2012 Updated pin dimensions
C November
2013
Added Pin 1 demarcations,
extended warranty, added CE
Mark, clarified stability with
resistive heaters
51 Evergreen Drive
Bozeman, Montana 59771
406-587-4910 (tel)
406-587-4911 (fax)
Sales & Tech Support
[email protected]
[email protected]