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DATASHEET AND OPERATING GUIDE
WHY56ND & WHY56ND-EV
Low Profile Temperature Controller & Evaluation Board
PRECISION, STABILITY & VERSATILITY
The advanced and reliable circuitry of the WHY56ND
Temperature Controller achieves 0.005ºC temperature
stability with thermistors. Its small, low profile package
is ideal for designs with space constraints. The linear,
PI (Proportional, Integrator) control loop offers maximum
stability and efficiency.
The WHY56ND is a general purpose analog PI control
loop for use with thermoelectrics or resistive heaters. The
WHY56ND maintains precision temperature regulation
using an active resistor bridge circuit that operates directly
with thermistors or RTD temperature sensors. (AD590 and
LM335 sensors require external circuits.) Supply up to
±2.2 A of heat and cool current to your thermoelectric from
a single +5 V power supply.
CONTENTS
e
Pb
RoHS
406-587-4910
www.teamWavelength.com
FEATURES
• Small Package Size 1.3" x 1.28" x 0.313"
• +5 to +26 V Control Electronics Supply
• +4.5 to +30 V Power Drive Supply
• Low Cost
• 0.005ºC Stability (typical)
• Linear PI Temperature Control
• High ±2.2 A Output Current
• Control Above and Below Ambient
• Master/Booster Operation
• Temperature Setpoint, Heat and Cool Current
Limits, Proportional Gain, and Integrator Time
Constant are set with external components.
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.
Connect two or more WHY56ND units together and drive
higher output currents.
LEADING EDGE APPLICATIONS
Onboard switches, connectors, and trimpots make
configuration and operation simple with the WHY56ND-EV
evaluation board. The WHY56ND has proven reliable in
such diverse fields as electro-optical systems, airborne
instrumentation, spectroscopic monitors, and medical
diagnostic equipment.
ORDERING INFORMATION
PAGE
2
PART NO
4
WHY56ND
6
WHY56ND-EV
7
WEV300
8
WEV301
14
WEV302
17
22
WTW002
23
WHS302
25
WXC303
26
WXC304
WXC305
© December 2022
DESCRIPTION
±2.2 A Temperature Controller
Evaluation PCB for WHY56ND
Thermal Solution Kit
Thermal Solution Kit with +5 V Fan
Thermal Solution Kit with +12 V Fan
Thermal Washer for Wxx Controllers
Heatsink for Wxx Controllers
+5 V Fan
+12 V Fan
Screw Kit
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Table of Contents
Related Manuals for Wavelength Electronics WHY56ND
Summary of Contents for Wavelength Electronics WHY56ND
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Page 1: Table Of Contents
PI (Proportional, Integrator) control loop offers maximum stability and efficiency. Connect two or more WHY56ND units together and drive higher output currents. The WHY56ND is a general purpose analog PI control loop for use with thermoelectrics or resistive heaters. The... -
Page 2: Quick Connect Guide
To ensure safe operation of the WHY56ND Temperature Controller, it is imperative that WHY56ND: The position of Pin 1 on the WHY is reversed you determine that the unit will be operating (or mirrored) relative to the position of Pin 1 on the WTC. - Page 3 Figure 3. LOAD NOTE: Use a max of +5 V power supply with the test load shown. Values shown can simulate any load up to the WHY56ND maximum of 2.2 A. Always check the SENS OUTA Calculator before operating the WHY56ND controller.
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Page 4: Pin Descriptions
BUFB in a master/booster configuration. NOTE: If you are upgrading from the WHY56ND to the WTC32ND: The position of Pin 1 on the WHY56ND is reversed (or mirrored) relative to the position of Pin 1 on the WTC32ND. © 2022... - Page 5 See Table 8 for output configuration for maximum voltage connection. Provides power to the WHY56ND H‑Bridge Power Stage. Supply range input for this Power Drive pin is +4.5 to +30 VDC. The maximum current drain on this terminal should not exceed Supply Input 2.5 A.
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Page 6: Electrical Specifications
WHY56ND TEMPERATURE CONTROLLER ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SYMBOL WHY56ND UNIT Supply Voltage 1 (Voltage on Pin 8) +5 to +26 Supply Voltage 2 (Voltage on Pin 10) +4.5 to +30 Output Current (See SOA Chart) ±2.2 Power Dissipation, T = +25ºC... -
Page 7: Safety Information
WHY56ND TEMPERATURE CONTROLLER SAFETY INFORMATION THEORY OF OPERATION The WHY56ND is an analog Proportional, Integral (PI) SAFE OPERATING AREA — DO NOT EXCEED control loop for use in thermoelectric or resistive heater INTERNAL POWER DISSIPATION LIMITS temperature control applications. The WHY56ND maintains... -
Page 8: Operating Instructions - Standalone
STANDALONE 100 mA of current. The V power supply is used to power the WHY56ND output H‑Bridge and must be capable of supplying a current greater than the LIMA and LIMB current NECESSARY EQUIPMENT limit settings. - Page 9 6.36 change per ºC for best stability. Table 4 compares temperature sensors versus their ability to maintain stable load temperatures with the WHY56ND. Figure 6 shows the circuit for adjustable current limits. Table 4. Temperature Sensor Comparison of voltage change 5 kΩ...
- Page 10 (cooler than) the setpoint temperature. considerable temperature overshoot. RTDs Figure 9 illustrates how to connect the WHY56ND for STEP 4 Control Loop Proportional Gain & operation with PTC (Positive Temperature Coefficient) RTD Integrator Time Constant - Pins 1, 3, 5, &...
- Page 11 WHY56ND TEMPERATURE CONTROLLER Table 5. Recommended Gain and Integrator Values Sensor Type/ Gain Integrator Time Constant Thermal Load Speed , seconds ] Thermistor / Fast 800 kΩ 1.0 MΩ 15 µF Thermistor / Slow 400 kΩ 2.0 MΩ 47 µF RTD / Fast 0.53...
- Page 12 INCREASING OUTPUT CURRENT DRIVE AGND SENS LIMA The WHY56ND is specifically designed to operate in a master/booster output current boosting configuration. Two WHY56ND or more WHY56ND controllers can be coupled to boost the +0.5V output current. PROPORTIONAL/INTEGRAL SENSOR CONTROL LOOP BRIDGE...
- Page 13 WHY56ND TEMPERATURE CONTROLLER THERMISTOR THERMOELECTRIC WHY56ND WHY56ND TEC MASTER CONTROLLER TEC BOOSTER CONTROLLER SETPOINT TRIMPOT 1.5 kΩ 1.5 kΩ 5 kΩ 5 kΩ SINGLE TURN SINGLE TURN ENABLE DISABLE SWITCH 1 Figure 11. Boosting Output Current Drive Table 6. Maximum Output Current (Amps) - NOTE: Do not use more than five controllers together...
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Page 14: Operation Instructions - Evaluation Board
WHY56ND-EV WITH HEATSINK AND FAN The equipment is the same as on page 8 with the • Match up the notch (Figure 12) on the WHY56ND with addition of the WHY56ND‑EV Evaluation Board and a Digital the silkscreen on the PCB multimeter, 4‑½... - Page 15 Connect the temperature sensor to the Sensor+ and Sensor‑ leads on the 4‑wire output cable. The default configuration of the WHY56ND‑EV allows for operation of the board with NTC thermistors in the range of 0 ‑ 20 kΩ. NOTE: Contact Wavelength Electronics to use the WHY56ND‑EV with other sensors or ranges.
- Page 16 STEP 8 ENABLING AND DISABLING THE OUTPUT CURRENT Enable and disable the WHY56ND output current using the onboard toggle switch. The output is enabled when the green ON LED indicator is lit. NOTE: Before enabling the output, make sure the RUN/SET switch is set to the “RUN”...
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Page 17: Additional Technical Information
(x.75” w/o FAN)(x1” w/FAN) WHY SERIES: FAN & HEATSINK MOUNTING Airflow Direction To mount the WHY56ND Series to the heatsink and fan (Figure 13) and optional evaluation PCB, refer to the 30 mm FAN WXC303 (+5VDC) or drawings and instructions below:... - Page 18 Figure 16. External Voltage Control Using Thermistor Temperature Coefficient) RTDs. This setup is useful Sensors when operating the WHY56ND in a DAC controlled system. Figure 18 illustrates an effective circuit. Equation 8 illustrates how to determine the setpoint voltage, , given a desired thermistor resistance (temperature).
- Page 19 Operation with AD590 & LM335 Sensors - AGND SENS Pins 1, 6, & 7 WHY56ND Use an AD590 or LM335 Sensor to operate the WHY56ND controller. Figure 20 illustrates how to connect the +0.5 V SENSOR BRIDGE AMPLIFIER WHY56ND for operation with PTC (Positive Temperature Coefficient) linear sensors AD590 or LM335.
- Page 20 If the SOA Calculator indicates the WHY56ND will be outside of the Safe Operating Area, the system must be changed SOA charts are included in this datasheet for quick reference, so that less power is dissipated within the controller.
- Page 21 WHY56ND TEMPERATURE CONTROLLER WHY56ND-EV EVALUATION BOARD SCHEMATIC © 2022 www.teamWavelength.com...
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Page 22: Troubleshooting
Switch off power to the system, reverse the connections to the The TEC may be connected ‑OR‑ WHY56ND, and then try again to operate the system. backwards to the WHY56ND Temperature is increasing TEC wiring polarity is dependent on the temperature sensor type (NTC vs. -
Page 23: Mechanical Specifications
WHY56ND TEMPERATURE CONTROLLER MECHANICAL SPECIFICATIONS 0.07 with heatsink and fan [1.8] with heatsink Airflow 0.40 [10.2] Direction WEIGHTS WHY56ND 0.6 oz 1.27 [32.3] 0.48 WHS302 Heatsink 0.5 oz [12.2] 0.87 [22.1] WXC303/4 Fan 0.3 oz 0.31 0.01 [7.9] [0.3] BOTTOM VIEW 4-40 UNC 0.945... - Page 24 WHY56ND TEMPERATURE CONTROLLER MECHANICAL SPECIFICATIONS — WHY56ND-EV EVALUATION BOARD For use with WHY56ND ENABLE WHY56ND-EV EVAL 0.945" [24.0 mm] 2.25" [57.2 mm] 0.65" [16.6 mm] LIM B LIM A CCW-0 AMPS CCW-0 AMPS CW-2 AMPS CW-2 AMPS 0.65" [16.6 mm] 0.945"...
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Page 25: Cabling Specifications
WHY56ND TEMPERATURE CONTROLLER CABLING SPECIFICATIONS These cables are included with the WHY56ND‑EV Evaluation Board. WTC3293-00101 INPUT CABLE PIN # COLOR FUNCTION MOLEX #43645-0600 BLUE PGND MICRO-FIT 6 CIRCUIT ORANGE SINGLE ROW RECPT BLACK WHITE GREEN WTC3293-00102 OUTPUT CABLE MOLEX #43645-0400... -
Page 26: 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.