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Wavelength Electronics WTC3243 Datasheet And Operating Manual

Ultrastable tec controller & evaluation board
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DATASHEET AND OPERATING GUIDE
WTC3243 & WTC3293
Ultrastable TEC Controller & Evaluation Board
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
6
8
11
12
20
28
32
34
36
Applies to WTC3243 Revisions A - C
WTC3243HB Revisions A - C
WTC3293 Revision B
© March 2019
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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Summary of Contents for Wavelength Electronics WTC3243

  • Page 1: Table Of Contents

    WTC3243 into your system and can be equipment. It is particularly well-suited to applications optimized for sensor type. Use the adjustable trimpots to where temperature is scanned across ambient. configure heat and cool current limits, proportional gain, and integrator time constant.

  • Page 2: Quick Connect Guide

    WTC3293 Eval Board Electrical Schematic page 4 position of Pin 1 on the WHY5640 is reversed (or mirrored) relative to the position of Pin 1 on the WTC3243. To ensure safe operation of the WTC3243 Thermoelectric Controller, it is imperative that you...
  • Page 3 Control Loop TOP VIEW Actual Temperature Monitor voltage TIE GROUND CONNECTIONS DIRECTLY TO PIN 13 Figure 3. WTC3243 Quick Connect for TEC with Thermistor QUICK CONNECT LEGEND FUNCTION WTC3243 & EVAL BOARD WTC3243 ALONE Table 6 on page 17 Limits Adjust LIMA &...

  • Page 4: Wtc3293 Evaluation Board Schematic

    WTC3243 TEMPERATURE CONTROLLER WTC3293 EVALUATION BOARD SCHEMATIC © 2019 www.teamWavelength.com...

  • Page 5: Pin Descriptions - Wtc3243

    Ground. Connect the power supply ground connections to GND (Pin 13). All ground connections to this pin should be wired separately. Power Drive Supply Input. Provides power to the WTC3243 H-Bridge power stage. Supply range input for this pin is +3 to +30 Volts DC. The maximum current drain on this terminal should not exceed 2.2 A.

  • Page 6: Pin Descriptions - Wtc3293 Eval Board

    Test Point 7 I TERM (measure resistance across TP6 and TP7) Terminal Block 1 (TB1), Input Power Terminal Block Power supply input for control electronics. Directly connected to WTC3243 V (Pin 1). Voltage Supply 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.

  • 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...
  • 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...
  • 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...

  • Page 11: Safety & Thermal Design Considerations

    WTC3243 TEMPERATURE CONTROLLER SAFETY INFORMATION THEORY OF OPERATION & THERMAL DESIGN The WTC3243 is a linear temperature controller that delivers bidirectional current to Peltier Effect thermoelectric coolers CONSIDERATIONS (TEC), or unidirectional current to resistive heaters. SAFE OPERATING AREA — DO NOT EXCEED...

  • Page 12: Operating Instructions - Wtc3243 + Eval

    8 mA of current. If a fan is needed, the fan draw current on V will also need to be added to the minimum required current. powers the WTC3243 output stage and must be sufficient to provide 1.1 times quiescent current and TEC current. = 1.1 * (I S_QUIESCENT...
  • Page 13 WTC3243 TEMPERATURE CONTROLLER SET THE VSET SOURCE JUMPER Figure 7 shows the jumper positions and Figure 8 shows the jumper location. • To use the onboard trimpot to generate the setpoint voltage (VSET), move the jumper to the trimpot or “T”...
  • Page 14 Or use Equation 1 to calculate the P GAIN trimpot Proportional Gain (P GAIN) and Integrator Time Constant resistance. (I TERM) can be adjusted during operation, but resistance readings will not match the table if the WTC3243 is installed. Equation 1. Calculating R from P GAIN 100,000 [Ω]...
  • Page 15 Where: is in Ohms (Ω) is in seconds 1. Match up the notch on the WTC3243 with the silkscreen on the PCB. 2. Align the pins with the sockets, ensuring that all pins are lined up in their respective sockets.
  • Page 16 ATTACH THE HEATSINK & FAN If a fan is required, align the fan with the heatsink. The direction The WTC3243 is designed to handle currents as high of air flow, as indicated on the fan, is into the heatsink. as 2.2 A and installing a heatsink and fan is optional when using less than +5 V or 500 mA during operation.
  • Page 17 Use Equation 5 to calculate the voltage at LIMA or LIMB used to power the WTC3243 output stage and must be corresponding to the desired limit current (I capable of supplying a current greater than the Limit A (LIMA) and Limit B (LIMB) current limit settings.
  • Page 18 Terminal Block 3 (TB3) includes three lines for externally connect the load (the thermoelectric cooler or resistive monitoring the WTC3243 temperature setpoint voltage heater) to the outputs (OUTA or OUTB). Use Table 7 to (SET T) and the actual temperature sensor voltage levels determine the connections to the outputs.
  • 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.

  • Page 20: Design Guide - Wtc3243

    SAFE OPERATING AREA AND THERMAL DESIGN CONSIDERATIONS SOA charts are included in this datasheet for quick reference, but we recommend you use the online tools instead. Refer to the SOA calculator for the WTC3243. www.teamwavelength.com/support/design-tools/soa-tc-calculator/ ENSURE SAFE OPERATION...
  • Page 21 Table 11 on page 27 Table 12 on page 27 The diagrams on this page demonstrate how to configure the WTC3243 for Table 10 on page 26 operation with a thermistor temperature sensor. An online calculation utility Equation 6 &...
  • Page 22 Table 11 on page 27 Table 12 on page 27 The diagrams on this page demonstrate how to configure the WTC3243 for Table 10 on page 26 operation with a Platinum RTD temperature sensor. An online calculation Equation 6 &...
  • Page 23 Table 11 on page 27 Table 12 on page 27 The following diagrams demonstrate how to configure the WTC3243 for Table 10 on page 26 operation with a National Semiconductor LM335 temperature sensor. An Equation 7...
  • Page 24 V be +8 V or greater. Table 9 on page 25 LIMA The following diagrams demonstrate how to configure the WTC3243 for Table 9 on page 25 LIMB operation with an Analog Devices AD590 Temperature Sensor. An online...
  • 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 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...
  • 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...

  • 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.

  • 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...
  • Page 33 WTC3243 TEMPERATURE CONTROLLER TROUBLESHOOTING, continued PROBLEM POTENTIAL CAUSES SOLUTIONS Temperature takes too long Temperature sensor may be Avoid placing the temperature sensor physically far from the to reach setpoint too far from the thermoelectric thermoelectric. This is typically the cause for long thermal lag and creates a sluggish thermal response that produces considerable temperature overshoot near the desired operating temperature.

  • Page 34: Mechanical Specifications

    [22.86] 1.30 [33.0] PCB FOOTPRINT 0.945 [24.00] SQ. The WTC3243 can be directly soldered to a PCB or installed in a socket soldered to the PCB. Two 7-pin SIP sockets are required. Wavelength recommends 0.125 [3.18] Thru Aries Electronics, PN 25-0513-10.
  • Page 35 1.39 [35.25] 2.02 0.52 [51.30] [13.21] 0.63 [16.00] The WTC3243 connects to the evaluation board by two 7-pin SIP sockets. The socket manufacturer is Aries Electronics, PN 25-0513-10. All dimensions are inches [mm]. All tolerances are ±5%. © 2019 www.teamWavelength.com...

  • 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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Wtc3293

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