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4

WTC3243 TEMPERATURE CONTROLLER

WTC3293 EVALUATION BOARD SCHEMATIC

VDD

1

VSET

2

LIMA

3

LIMB

4

P

5

+1V

6

I

7

SG

8

S+

9

BIAS

10

OUT

A

11

OUTB

12

GND

13

VS

14

U1 WTC3243

Q1

3904

Q2 3904

U2 2.5V

VDD

VDD

VDD

VDD

VDD

LED

GREEN

VDD

OUT

A

OUTB S+

+1V

P

I

VSET

LIMA

LIMB

BIAS

S-

VDD VS PGND

OUT

 A

OUT

 B

 SENSOR-

LIM A

LIM B

P GAIN

I TERM

SET

 T

SGND

0.00

2.5V

SET

 T

COM

GND

1

PWR

2

P1

Power Jack

VDD

1mA

100uA

10uA

EXT

 VSET

VDD

1 2 3

TB1

Input Connections

REN

ACT

 T

1 2 3 4

TB4

Output Connection

2

3

1

8

4

U4A

LM393AD

6

5

7

8

4

U4B

LM393AD

1

2

3

Q3 PMBT3906

VS

D2 LM4040 2.5V

CU4 0.1uF

CU3 0.1UF

VDD

C4 0.1UF

VDD

D1

1N4148

+

C3 4.7 uF

+

C1 4.7 uF

+

C2 4.7 uF

VS

VDD

VS

VDD

VDD

CU5 0.1UF

VDD

R52 N/L

R53 N/L

R54 N/L

R55 N/L

Limit B: To set a Fixed Limit Remove R19 and load R53

Limit A: To set a Fixed Limit Remove R18 and load R52

P Gain: To set a Fixed P

 Gain

Remove R8 and load R54

I TERM: To set a Fixed I 

Term

Remove R13 and load R55

TP7

TP4

TP3

TP5

CW

W

CCW

R5

200K

TP6

C5

0.1UF

C6

0.1UF

R50 N/L

R51 N/L

Set T

:

To set a Fixed Set point V

oltage

Remove R47 & R48 and load R50 & R51 Refer to Datasheet for Equations

TP2

TP1

1

2

3

JP2

T                      X

2

1

3

S1

ENABLE

CW

W

CCW

R4

200K

C7 0.1UF

9

10

8

4

11

U5C

OP747ARU

5

6

7

4

11

U5B

OP747ARU

13

12

14

4

11

U3D

OP747ARU

2

3

1

4

11

U3A

OP747ARU

5

6

7

4

11

U3B

OP747ARU

9

10

8

4

11

U3C

OP747ARU

VSET

 JUMPER

VDD

VDD

R47 0.00

R48 0.00

ST3

ST4

ON

S2

SW DIP-3 SMT

1

2

3

JP3 Gain

1 2 3

JP1

VS+VDD Jumper

Bias Selection

FAN+ FAN-

R23

100K

R26 100K

R28

1.0K

R16

10.0K

R27

1.0K

R31

1.0K

R33 10.0K

R32

10.2K

R34

1.0K

R35

10.2K

R7

10.0K

R36 10.0K

R15

90.9K

R25 9.76K

R24 10.0K

3.3V

R29 287

R14 287

LIMB

LIMA

R13 0.00

R8 0.00

R10 10.0K

R17 10.0K

R9

10.0K

R19 1.50K

R18 1.50K

VDD

R21

20K

R22

2K

R20

200K

R30

20K

R

11

10.0K

R6 10.0K

1

2

3

4

5

6

TB2

TB6

1

2

3

4

5

6

TB3

TB6

COM

HVSET

CW

CCW

R1

5k

CW

CCW

R2

5k

CW

CCW

R3

5k

ST1

ST2

I2

I1

P2

P1

LB2

LB1

LA1

LA2

RSET

x10

x1

2

1

DAQ

FAILSAFE

PROTECTION

CIRCUIT

Summary of Contents for WTC3293

Page 1: ...ATIONS The robust and reliable WTC3243 has been designed into electro optical systems airborne instrumentation spectroscopic monitors and medical diagnostic equipment It is particularly well suited to...

Page 2: ...rminethattheunitwillbeoperatingwithinthe internalheatdissipationSafeOperatingArea SOA Visit the Wavelength Electronics website for the most accurate up to date and easy to use SOA calculator www teamw...

Page 3: ...ge 25 Control Parameters PGAIN Table 5 on page 14 Equation 1 RP Table 11 on page 27 I TERM Table 5 on page 14 Equation 3 RI Table 12 on page 27 Bias Current Sensor Bias Switch Table 4 on page 13 Figur...

Page 4: ...Gain Remove R8 and load R54 I TERM To set a Fixed I Term Remove R13 and load R55 TP7 TP4 TP3 TP5 CW W CCW R5 200K TP6 C5 0 1UF C6 0 1UF R50 N L R51 N L Set T To set a Fixed Set point Voltage Remove R...

Page 5: ...peration requires that VDD be 8 V or greater 10 BIAS Sensor Bias Current Resistor Connection Connect a resistor between BIAS Pin 10 and VDD Pin 1 to configure the sensor bias current 11 OUTA Thermoele...

Page 6: ...y input for output stage Directly connected to WTC3243 VS Pin 14 PGND Power Ground Directly connected to WTC3243 GND Pin13 Terminal Block 2 TB2 Auxiliary Terminal Block FAN Fan Positive Red wire conne...

Page 7: ...ET to Sensor Voltage 1 V V The controller drives the TEC or heater to make the voltage across the sensor match the RSET voltage SET T Monitor to VSET 1 V V The setpoint temperature monitor voltage mat...

Page 8: ...VS 1 0 Volts Full temp range IOUT 2 2 A Short Term Stability 1 hour 0 0009 C OFF ambient temperature TSET 25 C using 10 k thermistor 1 Short Term Stability 1 hour 0 002 C ON ambient temperature TSET 2...

Page 9: ...ude the tolerance of the bias current resistor THERMAL Heatspreader Temperature Rise 28 to 33 C W TAMBIENT 25 C Heatspreader Temperature Rise 18 to 25 C W With WHS302 Heatsink WTW002 Thermal Washer He...

Page 10: ...put voltage range 0 6 5 VSET X 0 2 5 VSET T Volts X is the external setpoint jumper T is the internal trimpot jumper ACT T MON output voltage range 0 to VDD Volts Limited by bias current circuit 1 Sen...

Page 11: ...easures 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 temp...

Page 12: ...operation WTC3243 Temperature Controller WTC3293 PCB evaluation board Digital multimeter 4 digit resolution recommended Thermistor or other temperature sensor Peltier type thermoelectric module or res...

Page 13: ...T is Source Trimpot is Source Factory Default Figure 7 VSET Source Jumper Settings SET THE SENSOR BIAS SWITCH Use Table 4 to configure the evaluation board for your temperature sensor type Sensor sign...

Page 14: ...not match the table if the WTC3243 is installed P GAIN I TERM Figure 10 Location of the P GAIN and I TERM Trimpots Table 5 suggests starting points for P GAIN and I TERM depending on your sensor type...

Page 15: ...ATION BOARD The notch at the top of the WTC3243 must be orientedatthetopofthePrintedCircuitBoard PCB ThisorientationplacesPIN1intheupper left corner See Figure 11 below for proper orientation USE WITH...

Page 16: ...d on the WTC so the location of the wires matches your PCB Screw 4 40 PHPH x 0 75 w o FAN x 1 with FAN 30 mm FAN WXC303 5 VDC or WXC304 12 VDC WHS302 Heatsink WTW002 Thermal Washer WTC3243 Heat Spread...

Page 17: ...tion The 2 5 mm input power jack is attached to VDD You can use the Wavelength PWRPAK power supplies with this jack Use either the power jack or the power inputs on TB1 not both TheCOMMON COM terminal...

Page 18: ...gative termination directly to Pin 13 GND to avoid parasitic resistances and voltages affecting temperature stability and accuracy Connect thermistors and RTD sensors which are not polarized to SEN an...

Page 19: ...mpot can be adjusted from 0 V to 5 V To get above 4 5 V increase VDD to a minimum of 5 5 V To read the actual temperature and setpoint temperature of the device the power needs to be connected NOTE If...

Page 20: ...arts 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...

Page 21: ...on the WHY5640 is reversed or mirrored relative to the position of Pin 1 on the WTC3243 VS VDD TIE GROUND CONNECTIONS DIRECTLY TO PIN 13 1 WTC3243 Temperature Controller 1 2 3 4 5 6 7 14 13 12 11 10...

Page 22: ...ual Temperature Monitor voltage VDD RT RTD RBIAS RI RP RLIMA RLIMB RG Adjusting PI Control Loop Adjusting Limit Currents VSET VSET Sensor Resistance X Sensor Bias Current X 10 for 100 RTDs 1 1 1 NOTE...

Page 23: ...5640 The position of Pin 1 on the WHY5640 is reversed or mirrored relative to the position of Pin 1 on the WTC3243 TOP VIEW VS VDD TIE GROUND CONNECTIONS DIRECTLY TO PIN 13 1 WTC3243 Temperature Contr...

Page 24: ...or mirrored relative to the position of Pin 1 on the WTC3243 TOP VIEW VS VDD TIE GROUND CONNECTIONS DIRECTLY TO PIN 13 1 WTC3243 Temperature Controller 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Actual Temperat...

Page 25: ...Figure 25 shows fixed heating and cooling limits and is the standard implementation Figure 25 Fixed Heat and Cool Current Limits Figure 26 diagrams setting current limits independently using trimpots...

Page 26: ...or values for RBIAS and RG for various sensors and resistance values Equation 7 demonstrates how to calculate a value of RBIAS given a desired sensor bias current IBIAS Equation 7 Calculating RBIAS RB...

Page 27: ...ion 10 Calculating PGAIN from RP PGAIN 100 A V 100 000 1 RP SET THE CONTROL LOOP INTEGRATOR TIME CONSTANT To set the control loop Integrator Time Constant ITC insert a resistor RI between 1V Pin 6 and...

Page 28: ...CW terminal to the pin marked COM Do not use less than 2 k resistance or the 2 5 V will droop FAN REN HSET COM W CW CCW 2 5 V TB2 SET T ACT T LIMA LIMB COM RSET TB3 Figure 28 Example Wiring External R...

Page 29: ...43 installed Measure the PGAIN trimpot value across pins TP5 TP6 Remove resistor P2 Load P1 with a resistor of the value measured 1206 size BOTTOM VIEW RESISTOR LOCATIONS TOP VIEW TEST POINT LOCATIONS...

Page 30: ...LB2 and LB1 and TP4 TP1 respectively TOP VIEW TEST POINT LOCATIONS BOTTOM VIEW RESISTOR LOCATIONS Figure 32 LIMA LIMB Settings CHANGING ONBOARD SETPOINT TRIMPOT TO A FIXED RESISTANCE Connect an ohmme...

Page 31: ...ller VDROP VS VMAX VS is the power supply voltage 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 a...

Page 32: ...mponents of the thermal load Use thermal paste or washers between the load TEC and the TEC heatsink interfaces Ensure the temperature sensor is in good thermal contact with the load Unit may be operat...

Page 33: ...ase the current limit but DO NOT exceed the specifications of the TEC or heater The WTC3293 is not producing current The P GAIN or I TERM may be turned all the way counter clockwise CCW Turn the P GAI...

Page 34: ...00 2 54 1 30 33 0 0 20 5 1 1 26 32 0 0 33 1 28 32 5 0 945 24 00 0 945 24 00 2 PLS 4 40 UNC WTC3243 0 125 3 18 Thru 0 25 6 4 DIA KEEPOUT 4 Required 0 038 0 97 Dia Thru Hole 0 060 1 52 Dia Pad 14 Requir...

Page 35: ...19 4 83 1 880 47 75 57 15 2 25 0 19 4 83 0 17 4 32 2 42 61 47 0 13 3 3 THRU 4 PLS All dimensions are inches mm All tolerances are 5 Direction for Recommended Airflow Weights WTC3293 WTC3243 1 6 oz WHS...

Page 36: ...ion 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 furnishin...

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