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DATASHEET AND OPERATING GUIDE
WTC3243 & WTC3293
Ultrastable TEC Controller & Evaluation Board
NOT RECOMMENDED FOR NEW DESIGNS - SEE THE WTC32ND
WTC3243
PRECISION, STABILITY & VERSATILITY
The WTC3243 is a compact, analog PI (Proportional,
Integral) control loop circuit optimized for use in ultrastable
thermoelectric temperature control applications. It easily
handles variable operating conditions with a stability of better
than 0.0009ºC. The temperature setpoint is set by a remote
voltage signal. It is capable of controlling both thermoelectric
and resistive heaters, and only five external resistors are
needed to optimize the controller for your specific application.
The WTC3293 Evaluation Board is available to quickly
integrate the WTC3243 into your system and can be
optimized for sensor type. Use the adjustable trimpots to
configure heat and cool current limits, proportional gain, and
integrator time constant.
CONTENTS
The prior revision of the evaluation board was black. Click
www.teamwavelength.com/download/Datasheets/wtc3293a.pdf
for the datasheet for the WTC3293 revision A.
406-587-4910
www.teamWavelength.com
FEATURES AND BENEFITS
• Linear PI Control Stability of 0.0009°C
• Heat and Cool Current Limits
• Adjustable Sensor Bias Current
• Drive ±2.2 A of TEC or Resistive Heater Current
• Small Size of 1.3" X 1.28" X 0.313"
• Supports Thermistors, RTDs, and IC Sensors
• Single Supply Operation: +5 V to +30 V
• 14-pin DIP PCB Mount
• Monitor Actual Temperature
• Quickly and easily integrated with WTC3293
WTC3293
BUILT-IN SAFETY
To protect the device, heat and cool limits can be set
independently. This safety feature guarantees that your
thermoelectric cooler will never be driven beyond your
specified limits.
LEADING EDGE APPLICATIONS
The robust and reliable WTC3243 has been designed
into electro-optical systems, airborne instrumentation,
spectroscopic
equipment. It is particularly well-suited to applications
where temperature is scanned across ambient.
PAGE
2
4
5
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8
11
12
20
28
32
34
36
Applies to WTC3243 Revisions A - C
WTC3243HB Revisions A - C
WTC3293 Revision B
© February 2022
Evaluation Board
monitors,
ORDERING INFORMATION
PART NO
DESCRIPTION
WTC3243
±2.2 A Temperature Controller
±2.2 A Li-Ion Battery-Compatible
WTC3243HB
Temperature Controller
Evaluation Board for WTC3243
WTC3293
Temperature Controller
WEV300
Thermal Management Kit, no fan
WEV301
Thermal Management Kit, 5 V fan
WEV302
Thermal Management Kit, 12 V fan
e
Pb
RoHS
and
medical
diagnostic
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Table of Contents
Related Manuals for Wavelength Electronics WTC3293
Summary of Contents for Wavelength Electronics WTC3293
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Page 1: Table Of Contents
The robust and reliable WTC3243 has been designed needed to optimize the controller for your specific application. into electro-optical systems, airborne instrumentation, The WTC3293 Evaluation Board is available to quickly spectroscopic monitors, medical... -
Page 2: Quick Connect Guide
Pin 1 on the WTC3243. To ensure safe operation of the WTC3243 Thermoelectric Controller, it is imperative that you Figure 2 is the top view of the WTC3293, illustrating the determine that the unit will be operating within the onboard switches, trimpots, and connectors. - Page 3 WTC3243 TEMPERATURE CONTROLLER QUICK CONNECT GUIDE, cont’d VSET = Sensor Resistance X Sensor Bias Current Bandgap Voltage Reference WTC3243 LIMA Adjusting Limit Temperature Currents LIMB Controller BIAS Adjusting PI Control Loop TOP VIEW Actual Temperature Monitor voltage TIE GROUND CONNECTIONS DIRECTLY TO PIN 13 Figure 3.
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Page 4: Wtc3293 Evaluation Board Schematic
WTC3243 TEMPERATURE CONTROLLER WTC3293 EVALUATION BOARD SCHEMATIC © 2022 www.teamWavelength.com... -
Page 5: Pin Descriptions - Wtc3243
WTC3243 TEMPERATURE CONTROLLER PIN DESCRIPTIONS — WTC3243 Table 1. WTC3243 Temperature Controller Pin Descriptions NAME PIN DESCRIPTION Control Electronics Power Supply Input. Connect a +4.5 V to +30 V power supply to VDD (Pin 1) and GND (Pin 13). NOTE: can be connected to VS (Pin 14). Voltage Setpoint [Setpoint voltage equations are sensor dependent &... -
Page 6: Pin Descriptions - Wtc3293 Eval Board
WTC3243 TEMPERATURE CONTROLLER PIN DESCRIPTIONS — WTC3293 EVALUATION BOARD Table 2. WTC3293 Evaluation Board Pin Descriptions SILKSCREEN NAME FUNCTION LABEL Optional Supply Input. 2.5 mm jack power connection to V Power NOTE: Use either Input Supply (P1) or V on TB1 but not both. - Page 7 WTC3243 TEMPERATURE CONTROLLER Table 3. Control and Monitor Transfer Functions FUNCTION WTC3243 WTC3243HB WTC3293 DESCRIPTION The controller drives the TEC or heater to RSET to Sensor Voltage 1 V / V make the voltage across the sensor match the RSET voltage.
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Page 8: Electrical Specifications - Wtc3243
WTC3243 TEMPERATURE CONTROLLER ELECTRICAL SPECIFICATIONS — WTC3243 ABSOLUTE MAXIMUM RATINGS SYMBOL WTC3243 WTC3243HB UNIT NOTE Voltage on Pin 1 Supply Voltage 1 +4.5 to +30 +3 to +5.5 Volts DC Can be connected to V Consult SOA Calculator Voltage on Pin 14 Supply Voltage 2 +3 to +30 +3 to +8... - Page 9 WTC3243 TEMPERATURE CONTROLLER PARAMETER SYMBOL WTC3243 WTC3243HB UNIT NOTE VSET Input Impedence VSET MΩ VSET Damage Threshold VSET > V + 0.7 or < -0.7 Volts Rev. B Setpoint vs. Actual T Accuracy <2 TSET = 25ºC using 10 kΩ thermistor BIAS CURRENT Include the tolerance of...
- Page 10 WTC3243 TEMPERATURE CONTROLLER ELECTRICAL SPECIFICATIONS — WTC3293 + WTC3243 PARAMETER SYMBOL WTC3293 UNIT POWER SUPPLY = +4.5 to +30 Enable LED will not turn on Power Supply Voltage Volts = +3 to +30 when less than 3.5 V Quiescent Current DD-QUIESCENT = 10.5...
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Page 11: Safety & Thermal Design Considerations
• Local Enable on WTC3293 Evaluation Board: the controller can be configured so that the output is always on whenever power is applied to the unit. -
Page 12: Operating Instructions - Wtc3243 + Eval
WTC3243 TEMPERATURE CONTROLLER OPERATING INSTRUCTIONS — CONFIGURE THE JUMPERS & SWITCH On the underside of the WTC3293 Evaluation Board you WTC3243 + EVAL BOARD will find the jumpers and switches. Use Figure 5 below to locate them. WTC3243 WITH WTC3293 EVAL BOARD... - Page 13 Data Acquisition Failsafe Protection circuit. NOTE: When the VSET SOURCE jumper is in the “X” position or removed, the voltage dialed in using the SET T trimpot on the WTC3293 is ignored. Trimpot is Source RSET is Source HSET is Source (Factory Default) Figure 7.
- Page 14 WTC3243 TEMPERATURE CONTROLLER Table 5 suggests starting points for P GAIN and I TERM SET THE SENSOR GAIN JUMPER depending on your sensor type. To optimize control, refer The Sensor Gain Jumper allows the user to amplify sensor to Tech Note TN-TC01: Optimizing Thermoelectric Control voltage.
- Page 15 4-40x3/8” screws from the bottom of the PCB into the WTC3243 heat spreader. Choose opposite corners that will not interfere with fan mounting. 5. Attach the snap-in standoffs. See Figure 12. WTC3293 Standoff Positioning on page 16. © 2022...
- Page 16 (four provided) Figure 13. Attaching the WEV Thermal Components Figure 12. WTC3293 Standoff Positioning Clean all of the mating surfaces on the WTC electronics component and heatsink. It is important that no particulates or foreign matter are on either surface.
- Page 17 Use PGND for the power return. The common (COM) Once the LIMA and LIMB values are determined, toggle terminal on the WTC3293 is not intended to act as a the ENABLE to ON to apply power to V and V...
- Page 18 SEN+ and SEN- on Terminal Block 4 (TB4). ONLY Connect LM335 and AD590, which are polarized, as shown below. SEN+ Figure 15. WTC3293 Evaluation Board & Voltmeter SEN+ To read the ACT T, attach the voltmeter to the ACT T and SEN- 10 kΩ...
- Page 19 WTC3243 TEMPERATURE CONTROLLER ADJUST THE TEMPERATURE SETPOINT VOLTAGE The setpoint voltage can be adjusted either by using the evaluation board’s onboard SET T trimpot or by connecting a remote voltage source or potentiometer to the RSET or HSET inputs. Only one of these setpoints can be used. When controlling correctly, the SET T matches the ACT T at the desired temperature.
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Page 20: Design Guide - Wtc3243
WTC3243 TEMPERATURE CONTROLLER DESIGN GUIDE — WTC3243 NECESSARY EQUIPMENT DESIGN CONSIDERATIONS WHEN USING THE WTC3243 WITHOUT THE WTC3293 BOARD The following equipment is the minimum necessary to configure the WTC3243 for basic operation. The WTC3243 Thermoelectric Controller is designed to •... - Page 21 WTC3243 TEMPERATURE CONTROLLER OPERATING WITH THERMISTOR TEMPERATURE SENSORS QUICK CONNECT LEGEND A thermistor sensor has the best sensitivity, very small size, a temperature DIAGRAM range of -80º to +150º C, but poor linearity. TABLE OR EQUATION REFERENCE Table 9 on page 25 Thermistor temperature sensors should connect one terminal as close LIMA as possible to GND (Pin 13) to avoid parasitic resistances and voltages...
- Page 22 WTC3243 TEMPERATURE CONTROLLER OPERATING WITH RTD TEMPERATURE SENSORS QUICK CONNECT LEGEND An RTD sensor has good linearity, relatively small size, a temperature DIAGRAM range of -260º to +850º C, but poor sensitivity. TABLE OR EQUATION REFERENCE Table 9 on page 25 Resistive temperature sensors should connect one terminal as close LIMA as possible to GND (Pin 13) to avoid parasitic resistances and voltages...
- Page 23 WTC3243 TEMPERATURE CONTROLLER OPERATING WITH LM335 TYPE TEMPERATURE SENSORS QUICK CONNECT LEGEND LM335 temperature sensors have the best linearity, good sensitivity, a DIAGRAM temperature range of -40º to +100º C, but are large in size. TABLE OR EQUATION REFERENCE Table 9 on page 25 LM335 type temperature sensors should connect their negative termination LIMA directly to Pin 13 (GND) to avoid parasitic resistances and voltages affecting...
- Page 24 WTC3243 TEMPERATURE CONTROLLER OPERATING WITH AD590 TYPE TEMPERATURE SENSORS QUICK CONNECT LEGEND AD590 type temperature sensors have the best linearity, good sensitivity, DIAGRAM a temperature range of -20º to +105º C, but are larger in size. Operation TABLE OR EQUATION REFERENCE requires that V be +8 V or greater.
- Page 25 WTC3243 TEMPERATURE CONTROLLER Figure 25 shows fixed heating and cooling limits and is the CHOOSE THE HEATING AND COOLING standard implementation. CURRENT LIMIT RESISTORS — R & R Use Table 9 to select appropriate resistor values for R . The Heat and Cool Current Limits graph, Figure 24, shows the range of error for Table 9.
- Page 26 WTC3243 TEMPERATURE CONTROLLER RESISTIVE HEATER TEMPERATURE CONTROL SET THE SENSOR BIAS CURRENT AND SENSOR GAIN RESISTORS The WTC3243 can operate resistive heaters by disabling the cooling output current. When using Resistive Heaters Table 10 lists the suggested resistor values for R and R BIAS with NTC thermistors, connect LIMA (Pin 3) to GND (Pin 13)
- Page 27 WTC3243 TEMPERATURE CONTROLLER SET THE CONTROL LOOP PROPORTIONAL SET THE CONTROL LOOP INTEGRATOR TIME GAIN RESISTOR CONSTANT The control loop Proportional Gain can be set by inserting a To set the control loop Integrator Time Constant (I ), insert resistor, R , between PGAIN (Pin 5) and +1V (Pin 6) to set a resistor, R , between +1V (Pin 6) and I (Pin 7) to set I...
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Page 28: Additional Technical Notes
WTC3243 TEMPERATURE CONTROLLER ADDITIONAL TECHNICAL NOTES DAQ PROTECTION -- CHANGE DEFAULTS If the voltage set by the external input drops below 0.3 V, This section includes useful technical information on these the failsafe circuit is triggered and the setpoint defaults to topics: 1 V. - Page 29 WTC3243 TEMPERATURE CONTROLLER ELIMINATING TRIMPOTS To simplify set up or to minimize thermal drift, Wavelength recommends that you eliminate trimpots in circuitry. The following details how to use fixed resistances in place of trimpots. Wavelength can load boards at the factory to your specific requirements.
- Page 30 WTC3243 TEMPERATURE CONTROLLER CHANGING LIM TO A FIXED VALUE CHANGING ONBOARD SETPOINT TRIMPOT TO A FIXED RESISTANCE • Connect an ohmmeter to TP1 & TP3, without the WTC3243 installed. • Connect an ohmmeter to TP1 & TP2, without the WTC3243 installed. •...
- Page 31 Do not exceed the Safe Operating Area (SOA). Exceeding the SOA voids the warranty. 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 operating temperature.
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Page 32: Troubleshooting
WTC3243 TEMPERATURE CONTROLLER TROUBLESHOOTING PROBLEM POTENTIAL CAUSES SOLUTIONS Temperature is decreasing The TEC may be connected The convention is that the red wire on the TEC module connects to when it should be backwards to the WTC TEC+ (Pin 12) and the black wire to TEC- (Pin 11). If your TEC is increasing connected in this manner and the problem persists, the TEC module -OR-... - Page 33 Current limit may be set too low Increase the current limit but DO NOT exceed the specifications of the TEC or heater. The WTC3293 is not The P GAIN or I TERM may Turn the P GAIN and I TERM trimpot screws clockwise to the setting...
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Page 34: Mechanical Specifications
WTC3243 TEMPERATURE CONTROLLER MECHANICAL SPECIFICATIONS 0.07 [1.8] with heatsink and fan with heatsink Weights ↓ Air Flow ↓ 0.40 [10.2] WTC3243 0.6 oz 1.27 WHS302 Heatsink 0.5 oz 0.48 [32.3] WXC303/4 Fan 0.3 oz [12.2] 0.87 [22.1] 0.01 0.31 [7.9] [0.3] BOTTOM VIEW 4-40 UNC... - Page 35 MECHANICAL SPECIFICATIONS, continued 2.25 [57.15] 0.19 [4.83] 1.880 [47.75] 2.25 [57.15] 1.880 [47.75] Weights 0.13[3.3] THRU WTC3293 + WTC3243 1.6 oz 0.19 [4.83] 4 PLS WHS302 Heatsink 0.5 oz 0.17 [4.32] WXC303/4 Fan 0.3 oz 2.42 [61.47] Direction for Recommended Airflow 1.39...
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Page 36: Certification And Warranty
CERTIFICATION AND WARRANTY There are no user-serviceable parts inside this product. Return the CERTIFICATION product to Wavelength Electronics for service and repair to ensure that safety features are maintained. Wavelength Electronics, Inc. (Wavelength) certifies that this product met its published specifications at the time of shipment.
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