Wavelength Electronics WHY56ND User manual
ORDERING INFORMATION
PART NO DESCRIPTION
WHY56ND ±2.2 A Temperature Controller
WHY56ND‑EV Evaluation PCB for WHY56ND
WEV300 Thermal Solution Kit
WEV301 Thermal Solution Kit with +5 V Fan
WEV302 Thermal Solution Kit with +12 V Fan
WTW002 Thermal Washer for Wxx Controllers
WHS302 Heatsink for Wxx Controllers
WXC303 +5 V Fan
WXC304 +12 V Fan
WXC305 Screw Kit
PRECISION, STABILITY & VERSATILITY
The advanced and reliable circuitry of the WHY56ND
Temperature Controller achieves 0.005ºC temperature
loop for use with thermoelectrics or resistive heaters. The
with thermistors or RTD temperature sensors. (AD590 and
±2.2 A of heat and cool current to your thermoelectric from
FEATURES
•
• +5 to +26 V Control Electronics Supply
• +4.5 to +30 V Power Drive Supply
• Low Cost
•
• Linear PI Temperature Control
•
• Control Above and Below Ambient
•
• Temperature Setpoint, Heat and Cool Current
Constant are set with external components.
CONTENTS
QUICK CONNECT GUIDE 2
PIN DESCRIPTIONS 4
ELECTRICAL SPECIFICATIONS 6
SAFETY INFORMATION 7
OPERATING INSTRUCTIONS — STANDALONE 8
OPERATION INSTRUCTIONS — EVALUATION BOARD 14
ADDITIONAL TECHNICAL INFORMATION 17
TROUBLESHOOTING 22
MECHANICAL SPECIFICATIONS 23
CABLING SPECIFICATIONS 25
CERTIFICATION AND WARRANTY 26
e
PAGE
Pb
RoHS
Compliant
© December 2022
BUILT-IN SAFETY
To protect the device, heat and cool limits can be set
thermoelectric cooler will never be driven beyond your
LEADING EDGE APPLICATIONS
evaluation board. The WHY56ND has proven reliable in
instrumentation, spectroscopic monitors, and medical
WHY56ND & WHY56ND-EV
Low Profile Temperature Controller & Evaluation Board
DATASHEET AND OPERATING GUIDE
NEW IMAGE COMINGNEW IMAGE COMING
SOONSOON
© 2022 2
WHY56ND TEMPERATURE CONTROLLER
1
2
3
4
5
6
7
14
13
12
11
10
9
8
BUFB
OUTB
CGND
PGND
VS
OUTA
VDD
Buffer B
Thermoelectric Output B
Control Electronics Supply Ground
Power Drive Supply Ground
Power Drive Supply Input
Thermoelectric Output A
Control Electronics Supply Input
AGND
LIMB
LIMA
BUFA
PI
ERR
SENS
Analog Ground
Limit B
Limit A
Buffer A
Gain/Integrator Common
Temperature Error Output
Sensor and Setpoint Input
QUICK CONNECT GUIDE
WHY56ND Pin Layout page 2
page 2
WHY56ND Test Loads page 3
WHY56ND‑EV Evaluation Board Top view page 14
WHY56ND‑EV Eval Board Electrical Schematic page 21
!
Figure 1. WHY56ND Pin Layout - Top View
Figure 2. WHY56ND Quick Connect
Figure 1 shows the pin layout and descriptions for the
WHY56ND Temperature Controller.
Figure 2 is the Quick Connect schematic for the WHY56ND.
14
13
12
11
10
9
8
BUFB
OUTB
CGND
PGND
VS
OUTA
VDD
1
2
3
4
5
6
7
AGND
LIMB
LIMA
BUFA
PI
ERR
SENS
+-+
VS
+
VDD
RT
CL
RL
RG
RS
Setpoint
Trimpot
RA
RB
* Polarity varies
with sensor type
*
QUICK CONNECT LEGEND
WHY56ND Alone
Current Limits RA & RBSTEP 1 on page 8 LIM A & LIM B STEP 2 on page 15
Control Parameters
Proportional Gain &
RLSTEP 4 on page 10 P GAIN STEP 6 on page 15
CL &RGSTEP 4 on page 10 I TERM STEP 6 on page 15
Setpoint RSSTEP 3 on page 9 RSET STEP 7 on page 16
Sensor RTSTEP 3 on page 9 STEP 4 on page 15
NOTE: VSand VDD
NOTE: If you are upgrading from the WTC Series to the
WHY56ND: The position of Pin 1 on the WHY is reversed
(or mirrored) relative to the position of Pin 1 on the WTC.
© 2022 3
WHY56ND TEMPERATURE CONTROLLER
QUICK CONNECT GUIDE, cont’d
Figure 3. Test Load Conguration
RECOMMENDED TEST LOAD
heater, connected directly to Pin 9 and Pin 13 on the
controller, as shown in Figure 3.
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
Calculator
R1
R1 = 10 kΩ, ¼ W resistor
SENS
ERR
Simulated Thermistor
R
LOAD
OUTB
OUTA
R
LOAD
= 1 Ω, Rated >25 W
Thermal Test Load
© 2022 4
WHY56ND TEMPERATURE CONTROLLER
PIN DESCRIPTIONS
Table 1. WHY56ND Temperature Controller Pin Descriptions
PIN NAME PIN DESCRIPTION
1 AGND
Analog Ground
limit current resistors.
2 LIMB
Limit B
current drawn from the Pin 10 (VS
current limit when used with NTC sensors.
3 LIMA
Limit A
current drawn from the Pin 10 (VS
limit when used with NTC sensors.
4 BUFA Buer A
5 PI
Proportional Gain and Integrator Time Constant
Gand RLLwill also
connect in series with CLG
6 ERR Temperature Error Input
G
SENS Sensor and Setpoint Input
sensor, RT, and setpoint, RS, resistors.
VDD Control Electronics Supply Input. Power supply input for the WHY56ND’s internal control
9
Thermoelectric Output A
10 VS
Power Drive Supply Input
input for this pin is +4.5 to +30 VDC. The maximum current drain on this terminal should not exceed
2.5 A.
11 PGND Power Drive Supply Ground. Connect the VS
12 CGND Control Electronics Supply Ground. Connect the VDD
13
Thermoelectric Output B
14 BUFB Buer B
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 5
WHY56ND TEMPERATURE CONTROLLER
Table 2. WHY56ND-EV Evaluation Board Pin Descriptions
SILKSCREEN
LABEL NAME FUNCTION
LIMA Limit A Trimpot Sets the maximum output current drawn from the VSsupply input and delivered to
LIMB Limit B Trimpot Sets the maximum output current drawn from the VSsupply input and delivered to
P GAIN Proportional Gain
value.
I TERM
Constant
counter‑clockwise will decrease the value, while clockwise will increase the value.
RSET Setpoint
Resistance Trimpot
Figure 12
RSET SWITCH Run / Set Switch
Sensor + Positive connection to the sensor.
Sensor ‑
heaters can be connected either way for quick connection. See Table 8 for output
heaters can be connected either way for quick connection. See Table 8 for output
VS Power Drive
Supply Input
pin is +4.5 to +30 VDC. The maximum current drain on this terminal should not exceed
2.5 A.
VDD Control Electronics
Supply Input
for this pin is +5 to +26 VDC.
PGND Power Drive
Supply Ground
Connect the VS
VM1 & VM2
& 2
WHY56ND setpoint resistance and the actual temperature sensor resistance levels
Equation 7.
Common
switch
© 2022 6
WHY56ND TEMPERATURE CONTROLLER
ELECTRICAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS SYMBOL WHY56ND UNIT
VDD +5 to +26 VDC
VS+4.5 to +30 VDC
IS±2.2 A
Power Dissipation, TAMBIENT = +25ºC PMAX 9 W
T ºC
TSTG ‑65 to +150 ºC
OPERATING PARAMETER
TEMPERATURE CONTROL
TEST CONDITIONS MIN TYP MAX UNITS
TSET 0.001 0.005 0.01 ºC
TSET 0.003 0.01 ºC
CONTROL LOOP P PI
1 100 A / V
0 10 sec
Setpoint vs. Actual T Accuracy <1% %
OUTPUT, THERMOELECTRIC
±2.0 ±2.2 A
S= 100 mA | VS | VS‑ 0.5 | V
S= 1 A | VS‑ 1.2 | | VS‑ 1.0 | V
S= 2 A | VS‑ 1.6 | | VS‑ 1.4 | V
POWER SUPPLY
S4.5 30 V
DD 5 26 V
Current, VSsupply, Quiescent 45 90 mA
Current, VDD supply, Quiescent 10 15 mA
INPUT
1 2 mV
Bias Current AMBIENT = 25ºC 20 50 nA
AMBIENT = 25ºC 2 10 nA
0 VDD‑1.5 V
60 dB
60 dB
Input Impedance 500
THERMAL
Heatspreader Temperature Rise TAMBIENT = 25ºC 30 33 ºC / W
Heatspreader Temperature Rise With WHS302 Heatsink, WTW002
Thermal Washer 21.5 25 ºC / W
Heatspreader Temperature Rise
With WHS302 Heatsink, WTW002
Thermal Washer, and 3.5 CFM
Fan
3.1 3.4 3.9 ºC / W
Pin Solderability Time
5 sec
© 2022
WHY56ND TEMPERATURE CONTROLLER
SAFETY INFORMATION
SAFE OPERATING AREA — DO NOT EXCEED
INTERNAL POWER DISSIPATION LIMITS
!
Application Note AN-LDTC01: The Principle of the Safe
Operating Area How to use the Safe
.
PREVENT DAMAGE FROM ELECTROSTATIC
DISCHARGE
preventable with simple precautions.
AN-LDTC06: Basics: Electrostatic Discharge (ESD).
We recommend that you always observe ESD precautions
THERMAL MANAGEMENT KITS
They include thermal washers, heatsinks, and fans. These
products are available either as individual accessories,
THEORY OF OPERATION
control loop for use in thermoelectric or resistive heater
temperature control applications. The WHY56ND maintains
temperature sensors.
temperature of the sensor that is connected to the thermal
the setpoint resistance, and then keep them equal in spite
load.
The controller measures the load temperature by the
resistances of the sensor and the setpoint resistor.
While the output is enabled the controller continuously
compares the setpoint resistance and the actual sensor
The controller includes features that help protect the load
Operating Instructions — Standalone on page 8.
• Current limit:
heater.
• External or Onboard temperature setpoint control: for
an automated control system, the temperature setpoint
• Local Enable on WHY56ND-EV Evaluation Board:
always on whenever power is applied to the unit.
• Control loop: the controller employs a smart
current.
© 2022
WHY56ND TEMPERATURE CONTROLLER
The VDD power supply is used to power the WHY56ND
100 mA of current. The VSpower supply is used to power
See Figure 2
A heatsink may be required to properly dissipate heat from
dissipation is 9 Watts for the WHY56ND
.
OPERATION WITH THERMOELECTRICS
STEP 1 Limit Output Current - Pins 1- 3
Figure 4 shows the circuit
for correct connections.
Figure 4. Fixed Heat and Cool Current Limits
Refer to Table 3 or Figure 5 to select appropriate resistor
values for RAand RB.
Figure 5. Resistor Value vs. Output Current
Figure 5 shows the relationship between current limit
resistor RX(either RAor RB
the controller. Table 3 shows these values.
1 23
AGND WHY56ND LIMA LIMB
RA
RB
x
x
OPERATING INSTRUCTIONS —
STANDALONE
NECESSARY EQUIPMENT
WHY56ND for basic operation.
• WHY56ND Temperature Controller
• Thermistor or other temperature sensor
• Peltier‑type thermoelectric cooler or resistive heater
•
•
•
•
SYSTEM DESIGN DECISIONS
•
•
•
GROUNDING
sensor or thermoelectric connected to the metal enclosure
or in the case of laser diodes, the laser anode or cathode.
POWER SUPPLY REQUIREMENTS
+5 to +26 VDC for VDD and +4.5 to +30 VDC for VS. The
Electrical Specications on page 6.
Unless Earth and Instrument Ground are
connected via the power supply, Instrument Ground
is floating with respect to Earth Ground
Earth Ground on
USA 115 VAC wall socket
Common or
Instrument Ground
EARTH
DC POWER SUPPLY
- +
© 2022 9
WHY56ND TEMPERATURE CONTROLLER
Table 3. Current Limit Set Resistor vs Maximum Output
Current
Maximum
Output
Current
(Amps)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
Current
Limit Set
Resistor
(kΩ)
RA, RB
1.60
1.69
1.78
1.87
1.97
2.08
2.19
2.31
2.44
2.58
2.72
2.88
3.05
3.23
3.43
3.65
3.88
4.13
4.42
4.72
5.07
5.45
5.88
6.36
Figure 6
Figure 6. Independently Adjustable Heat and Cool Current
Limits
CCW
1 23
AGND WHY56ND LIMA LIMB
RA
RB
CW
W
CCW
CW
W
1.5 kΩ
1.5 kΩ
5 kΩ
SINGLE TURN
TRIMPOT
5 kΩ
SINGLE TURN
TRIMPOT
STEP 2 Disabling Output Current - Pins 1 - 3
and disable the output current as shown in Figure 7.
Figure 7. Enable/Disable Output Current Circuit
STEP 3 Sensors - Pins 1, 6, & 7
SENSOR SELECTION
Select a temperature sensor that is responsive around the
Table 4 compares temperature sensors versus their ability
to maintain stable load temperatures with the WHY56ND.
Table 4. Temperature Sensor Comparison of voltage change
per degree Celsius
SENSOR Thermistor RTD AD590 LM335
RATING Best Poor Good Good
previously described sensors can be found in the Additional
Technical Information on page 17.
THERMISTOR
Connect a setpoint resistor, RS
T
Figure 8 shows the thermistor operation
circuit.
1 23
AGND WHY56ND LIMA LIMB
RA
RB
1.5 kΩ
DISABLE
RB-1.5 kΩ
1.5 kΩ
RA-1.5 kΩ
ENABLE
DPST SWITCH
© 2022 10
WHY56ND TEMPERATURE CONTROLLER
+0.5 V
SENSOR BRIDGE AMPLIFIER
RSRT
1 7 6
THERMISTOR
SETPOINT
TRIMPOT
WHY56ND
ERRAGND SENS
Figure 8. Thermistor Operation Circuit
Select setpoint resistor, RS, equal to the thermistor resistance
When the setpoint resistor, RS, and thermistor, RT, are equal
If the setpoint resistor, RS
resistance, RT
If the setpoint resistor, RS, is smaller than the thermistor
resistance, RT
RTDs
Figure 9 illustrates how to connect the WHY56ND for
sensors. Resistors, R2
2to be
double the resistance of the RTD.
+0.5 V
SENSOR BRIDGE AMPLIFIER
R
S
R
RTD
1 7 6
RTD
SETPOINT
TRIMPOT
WHY56ND
ERRAGND SENS
R2
R2
Figure 9. RTD Operation Circuit
Select setpoint resistor, RS, equal to the RTD resistance,
RRTD
When the setpoint resistor, RS, and RTD, RRTD, are equal
If the setpoint resistor, RS
RRTD
since the temperature sensed by the RTD is below (cooler
If the setpoint resistor, RS, is smaller than the RTD resistance,
RRTD
since the temperature sensed by the RTD is above (hotter
LM335s AND AD590s
Additional
Technical Information on page 17.
TEMPERATURE SENSOR MOUNTING
considerable temperature overshoot.
STEP 4 Control Loop Proportional Gain &
Integrator Time Constant - Pins 1, 3, 5, & 6
of the two resistors and capacitors (RG, RL, and CL; refer
to page 2
Recommended values for the three components are shown
in Table 5 for common sensor and load combinations. A
commands.
the controller to a variety of load conditions not covered in
Table 5.
The relationship between the three components is
T, in Equation 3.
© 2022 11
WHY56ND TEMPERATURE CONTROLLER
• As kT
Lvalues are
required.
• Keep RL L
temperature control stability.
• As RLbecomes smaller, CL
L.
Use Equation 1 to calculate the Proportional Gain, kP
kP= 4 ( ) amps / volt
RL
RG
(1)
C
tC= ( ) seconds
RGCL
4(2)
Use Equation 3 to calculate the relationship between kP
, tC,
and kT.
kƬ= kPtCamp•seconds / volt (3)
Use Equations 4, 5 , and 6 to relate kTto component values.
kƬ= CLRLamp•seconds / volt (4)
(5)
(6)
STEP 5 Fine Tuning RG, RL, and CL
The RG, RL, and CL
experimentally. Start with component values from Table 5,
and operate the temperature controller system to determine
1. Short CL
P L
Critical Gain value of the system. Measure the period
of the oscillation in seconds.
3. Decrease RLby half.
4. Use Equation 2 to calculate RGand CLso that the
value of tC
period measured above.
RG= ( ) ohms
4RL
kP
RL
Gain
[ kP]
Sensor Type/
Thermal Load Speed
1.0 MΩ5Thermistor / Fast
Thermistor / Slow 2.0 MΩ20
20
1.8 MΩ50
50
RTD / Fast
RTD / Slow 2.2 MΩ100
2.0 MΩ
AD590 or LM335 / Slow
AD590 or LM335 / Fast
4.0 MΩ
RG
800 kΩ
400 kΩ
144 kΩ
88 kΩ
400 kΩ
320 kΩ
Integrator Time Constant
[ tC, seconds ]
CL
15 µF
47 µF
15 µF
47 µF
10 µF
15 µF
3
4.5
1
0.53
4.5
1
Table 5. Recommended Gain and Integrator Values
RG= ( ) ohms
4tC
CL
© 2022 12
WHY56ND TEMPERATURE CONTROLLER
STEP 6 [OPTIONAL] Monitoring Setpoint & Actual
Sensor Voltages - Pins 1, 3, 5 - 7
Figure 10.
Figure 10. Monitor Setpoint and Actual Sensor Voltages
Circuit
Figure 10.
The circuit shown in Figure 10 uses a constant current
NOTE: PTC (Positive Temperature Coecient) sensors
such as RTD sensors, the AD590, and the LM335 require
that the output Pins 9 (OUTA - ) and 13 (OUTB +) be
reversed from the connection diagram on page 2
(Figure 2) to produce the proper cooling and heating
currents through the thermoelectric.
Figure 10, connect the
OPERATION WITH RESISTIVE HEATERS
sensors with a resistive heater.
Connect the resistive heater to Pins 9 and 13 to operate.
INCREASING OUTPUT CURRENT DRIVE
or more WHY56ND controllers can be coupled to boost the
output current.
Figure 11 shows how to connect two WHY56ND controllers
booster controller is controlled by the master controller by
Pins 4 and 14, to drive the next booster units output drive
section via its Pins 3 and 2. The master controller sets the
current limits for all successive booster controllers connected
cool limit resistors.
Use Table 6Aand
RB, based on the number of WHY56ND controllers paralleled
+0.5V
SENSOR
BRIDGE
AMPLIFIER
1 7 6
10 kΩ
10 kΩ
10 kΩ10 kΩ
10 kΩ
10 kΩ
SENSOR
VOLTAGE
MONITOR
SETPOINT
VOLTAGE
MONITOR
VDD
VREF2
VDD
RTor RRTD
VREF1 VREF1
R4
R4ISENSE
=
LM324A
LM324D
LM324C
LM324B
THERMISTOR
OR
RTD
5
RG
3
RL
CL
+1V
PROPORTIONAL/INTEGRAL
CONTROL LOOP
AGND SENS ERR PI LIMA
2N3906
2kΩ
5kΩ
2kΩ
SS
WHY56ND
© 2022 13
WHY56ND TEMPERATURE CONTROLLER
5 kΩ
SINGLE TURN
RT
THERMISTOR
CL
RS
SETPOINT
TRIMPOT
V
DD
ENABLE
RB
V
S
+ +
RA
RG
RL
5 kΩ
SINGLE TURN
DISABLE
SWITCH 1
THERMOELECTRIC
+
-
1.5 kΩ 1.5 kΩ
141312111098
1234567
WHY56ND
TEC BOOSTER CONTROLLER
NC
NCNC
141312111098
1234567
WHY56ND
TEC MASTER CONTROLLER
Figure 11. Boosting Output Current Drive
Table 6. Maximum Output Current (Amps) - NOTE: Do not use more than ve controllers together
1 WHY56ND
CONTROLLER
2 WHY56ND
CONTROLLERS
3 WHY56ND
CONTROLLERS
4 WHY56ND
CONTROLLERS
5 WHY56ND
CONTROLLERS
CURRENT LIMIT
SET RESISTOR (KΩ)
RA, RB
0 0 0 0 0 1.60
0.1 0.2 0.3 0.4 0.5 1.69
0.2 0.4 0.6 1.0
0.3 0.6 0.9 1.2 1.5
0.4 1.2 1.6 2.0
0.5 1.0 1.5 2.0 2.5
0.6 1.2 2.4 3.0 2.19
1.4 2.1 3.5 2.31
1.6 2.4 3.2 4.0 2.44
0.9 3.6 4.5
1.0 2.0 3.0 4.0 5.0
1.1 2.2 3.3 4.4 5.5
1.2 2.4 3.6 6.0 3.05
1.3 2.6 3.9 5.2 6.5 3.23
1.4 4.2 5.6 3.43
1.5 3.0 4.5 6.0 3.65
1.6 3.2 6.4
3.4 5.1 4.13
3.6 5.4 9.0 4.42
1.9 9.5
2.0 4.0 6.0 10.0
2.1 4.2 6.3 10.5 5.45
2.2 4.4 6.6 11.0
2.3 4.6 6.9 9.2 11.5 6.36
© 2022 14
WHY56ND TEMPERATURE CONTROLLER
OPERATION INSTRUCTIONS —
EVALUATION BOARD
WHY56ND WITH WHY56ND-EV EVAL BOARD
See page 17
NECESSARY EQUIPMENT
The equipment is the same as on page 8 with the
SYSTEM DESIGN DECISIONS
•
•
•
Follow the next nine steps sequentially to safely operate
.
Before proceeding with conguration of the WHY56ND
and the WHY56ND-EV, it is critical that you verify that
the controller will be within the Safe Operating Area.
!
STEP 1 INSTALL WHY56ND ON THE
WHY56ND-EV WITH HEATSINK AND FAN
• Match up the notch (Figure 12
the silkscreen on the PCB
•
lined up in their respective sockets.
• Make sure that
none of the pins were bent during insertion before
continuing.
• Figure 15
See Additional Technical Information on page 17 for
to determine
proper thermal solution and operation for your application.
WEV300, WEV301, and WEV302 Thermal Solutions Kits
WHY56ND-EV EVAL
CW-2 AMPS
CCW-0 AMPS
SENSOR+
OUTPUT B
LIM A
FAN
(+)
(-)
COM
VM2
VM1
CW-2 AMPS
CCW-0 AMPS
LIM B
OUTPUT A
SENSOR-
RUN
RSET
CW - Incr
CCW - Decr
(sec)
I TERM
PGND
VS
VDD
OFF
ENABLE
ON
WAVELENGTH
ELECTRONICS
For use with
WHY56ND
CW - Decr
CCW - Incr
P GAIN
SET
Output
Enable/Disable
Proportional
Gain Trimpot
Integrator Time
Constant Trimpot
Setpoint Test
Points
Setpoint
Trimpot
Setpoint
Run/Set
Switch
Fan
Connections
Current
Limit A
Trimpot
Current
Limit B
Trimpot
Notch
\\
Figure 12. WHY56ND-EV Evaluation Board Top View
© 2022 15
WHY56ND TEMPERATURE CONTROLLER
STEP 2 CONFIGURE THE HEAT AND COOL
CURRENT LIMITS
on the WHY56ND‑EV. The evaluation board’s LIMA and
increase the limit, and counter‑clockwise turns will decrease
the current limit value. Use Table 7
cool current limits. Do not exceed SOA limits.
Table 7. LIMA and LIMB Current Limit Trimpot Conguration
SENSOR
TYPE LOAD TYPE LIMA
TRIMPOT
LIMB
TRIMPOT
Thermistor Thermoelectric Cool Current
Limit
Heat Current
Limit
Thermistor Resistive
Heater
Turn Fully
CCW
Heat Current
Limit
STEP 3 CONNECT THE THERMAL LOAD
Table 8
Table 8. Output Conguration
SENSOR
TYPE
LOAD
TYPE OUTPUT A OUTPUT B
Thermistor Thermo‑
electric
Terminal
Positive TEC
Terminal
Thermistor Resistive
Heater
Quick Connection: Simply connect
fully counterclockwise.
Maximum Voltage Connection:
Connect one side of the resistive
S.
RTD Resistive
Heater
Maximum Voltage Connection:
Connect one side of the resistive
S.
fully counterclockwise.
STEP 4 CONNECT YOUR TEMPERATURE
SENSOR
Connect the temperature sensor to the Sensor+ and Sensor‑
of the WHY56ND‑EV allows for operation of the board with
NOTE:
STEP 5 ATTACHING THE VDD AND VS
POWER SUPPLIES
Ensure that the controller can be safely operated by
checking the SOA Calculator website. The VDD power
supply is used to power the WHY56ND internal control
current. The VSpower supply is used to power the WHY56ND
simple operation tie VDD to VS. A separate VSpower supply
4.5 V required by the VDD supply. Select VSapproximately
WHY56ND. Connect both power supplies via the PGND line
Spower supply may be required.
!
STEP 6 ADJUST THE LOOP
COMPENSATION PROPORTIONAL GAIN AND
INTEGRATOR TIME CONSTANT
For a better explanation of how the I term and P term trimpots
STEP 4
on page 10 Gin the equations on
page 10 L. CLand RLare both
related to RGin Equation 5 and Equation 6.
© 2022 16
WHY56ND TEMPERATURE CONTROLLER
STEP 7 ADJUST THE SETPOINT
TEMPERATURE
the resistance between the two test points next to the RSET
to the resistance value of the thermistor at the desired
position. Figure 12 shows the location of the RUN/SET
switch and test points.
STEP 8 ENABLING AND DISABLING THE
OUTPUT CURRENT
NOTE: Before enabling the output, make sure the
RUN/SET switch is set to the “RUN” position. When
enabled with this switch in the “SET” position, the
controller will run at the cooling current limit regardless
of the temperature setpoint, which can cause damage to
the controller or your thermal load.
STEP 9 MONITOR SETPOINT AND ACTUAL
TEMPERATURE VOLTAGES
actual temperature. The input connector includes three lines
and the actual temperature sensor resistance levels by
RT=(VM2‑VM1RSET (7)
VM1
© 2022
WHY56ND TEMPERATURE CONTROLLER
ADDITIONAL TECHNICAL
INFORMATION
WHY SERIES: FAN & HEATSINK MOUNTING
To mount the WHY56ND Series to the heatsink and fan
(Figure 13
ASSEMBLY INSTRUCTIONS
Refer to Figure 14.
•
and heatsink. It is important to remove particulates and
• Apply the WTW002 Thermal Washer to the WHS302
with the heatsink holes.
• Secure the WHS302 Heatsink and the WXC303/304
can be rotated on the WHY so the location of the wires
WHY56ND and WHY56ND‑EV assembly instructions
(Figure 15
• Match up the notch (shown in Figure 12
WHY56ND with the silkscreen on the PCB
•
lined up in their respective sockets.
• Make sure that
none of the pins were bent during insertion before
continuing.
•
Screw: 4-40 PHPH
(x.75” w/o FAN)(x1” w/FAN)
30 mm FAN
WXC303 (+5VDC) or
WXC304 (+12VDC)
WHS302 Heatsink
WTW002
Thermal Washer
WHY56ND
Heat Spreader
Airflow
Direction
Figure 13. WHY56ND Assembled with Heatsink
& Fan
Figure 14. WHY56ND, Heatsink, and Fan
Mounting
Figure 15. WHY56ND and WHY56ND-EV
Assembly
WHY56ND
Component
Pin #1
4 REQUIRED
WHY56ND‑EV
Evaluation
Board
© 2022
WHY56ND TEMPERATURE CONTROLLER
Configuration for External Setpoint Voltage with
Thermistor Sensors - Pins 1, 6, & 7
Figure 16 illustrates
WHY56ND in a DAC controlled system.
+0.5V
SENSOR BRIDGE AMPLIFIER
RT
17 6
THERMISTOR
VIN
+
-
1/2LM358
AGND SENS ERR
WHY56ND
R1
Figure 16. External Voltage Control Using Thermistor
Sensors
Equation 8
VIN
(8)
Resistor, R1
IN
above and below the ambient temperature. In most
applications select resistor R1equal to two times the desired
T. For example, for a
1
NOTE: Pin 9 (OUTA) is the heating current sink and
Pin 13 (OUTB) is the cooling current sink.
Figure 17 demonstrates an example of how to use an
VIN = 0.5 – RT
2R1
+0.5V
SENSOR BRIDGE AMPLIFIER
RT
17 6
THERMISTOR
VIN
+
-1/2LM358
AGND SENS ERR
WHY56ND
20 kΩ
10 kΩ
Figure 17. Example Using a 10kΩ Thermistor with External
Voltage Control
Configuration for External Setpoint Voltage with RTD
Sensors - Pins 1, 6, & 7
Figure 18
Figure 18. External Voltage Control Using RTD Sensors
Equation 9
VIN
(9)
+0.5V
SENSOR BRIDGE AMPLIFIER
RRTD
17 6
RTD
VIN
+
-1/2LM358
AGND SENS ERR
WHY56ND
R2
VIN = 0.5 – RRTD
2R2
© 2022 19
WHY56ND TEMPERATURE CONTROLLER
Resistor, R2
IN
above and below the ambient temperature. In most
applications select resistor, R2, equal to two times the
RTD.
Figure 19 demonstrates an example of how to use an
Figure 19. Example Using a 100 Ω RTD with External Voltage
Control
Operation with AD590 & LM335 Sensors -
Pins 1, 6, & 7
Use an AD590 or LM335 Sensor to operate the WHY56ND
controller. Figure 20 illustrates how to connect the
WHY56ND for operation with PTC (Positive Temperature
bottom circuit.
Equation 10 illustrates how to determine the setpoint
resistance, RS
measured in Celsius.
Rs= 2R3Celsius(10)
Resistor, R3
S. Select resistor R3
Figure 21 demonstrates an example of how to use an
AD590 to control from ‑50ºC to +150ºC.
Figure 22 illustrates the setpoint resistance, VIN, versus
AD590 temperature for the example in Figure 21.
+0.5V
SENSOR BRIDGE AMPLIFIER
R3
RS
17 6
SETPOINT
RESISTOR
VT= 1 mV/Kelvin
VDD
LM335
10 mV/Kelvin
+VT
-VT
AGND
1/2LM358
SENS ERR
WHY56ND
1 kΩ
9 kΩ
1 kΩ
VDD
1 kΩ
AD590
1 µA/Kelvin
+VT
-VT
-VT
+VT
OR
Figure 20. AD590 & LM335 Operation Circuit
Figure 21. Example Using AD590 Sensor
Figure 22. Example Setpoint Resistance vs. AD590
Temperature
RS
176
VT= 1 mV/Kelvin
V
DD
1 kΩ
AD590
1 µA/Kelvin
AGND SENS ERR
1/2 LM358
1.5 kΩ10 kΩ
+0.5 V
SENSOR BRIDGE AMPLIFIER
WHY56ND
SETPOINT
RESISTOR
5 kΩ TRIMPOT
+0.5V
SENSOR BRIDGE AMPLIFIER
RRTD
17 6
100 Ω RTD
VIN
+
-1/2LM358
AGND SENS ERR
WHY56ND
200 Ω
5
6
4
3
2
1
-50 0 50 100 150
0
Temperature (Celsius)
Setpoint Resistance (kohms)
RS Setpoint Resistor
© 2022 20
WHY56ND TEMPERATURE CONTROLLER
SAFE OPERATING AREA
determined by the amount of power that can be dissipated
!
is fast and easy to use, and also takes into consideration
however we recommend you use the online tools instead.
.
and fan is shown in Figure 23
VS = 5 Volts
I
1: No heatsink required (PWHY < 1.2 W)
2: WHS heatsink required (PWHY < 2 W)
3: Heatsink and 3.5CFM fan required
(2 W < PWHY < 9 W)
4: Unsafe Operating Area
PWHY =Power internally dissipated in the WHY56ND
1
2
3
4
510 15 20 25
0
0
0.5
1.0
1.5
2.0
Voltage Drop Across WHY (VS- VLOAD) (V)
Maximum Supply Current from VS(A)
25ºC Ambient
75ºC Case
B
BB
A C
Follow these steps to determine if the controller will be
•
•
V = VS‑ V (VS
• Mark V on the X‑axis, and extend a line upward
• Mark I
line
• S
• Sto the intersection of the
V and I lines; this is the Load Line
•
so that less power is dissipated within the controller. See
AN-LDTC01: The
Principle of the Safe Operating Area for information on
Figure 23. WHY56ND SOA
This manual suits for next models
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