WHY5640 GENERAL DESCRIPTION: FEATURES: Online SOA Calculator at. Figure 1 TOP VIEW

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Wilfred York
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GENERAL DESCRIPTION: FEATURES: SUBMINIATURE

position of Pin 1 on the is reversed (or

1 GENERAL DESCRIPTION: FEATURES: SUBMINIATURE TEMPERATURE CONTROLLER Online SOA Calculator at Figure 1 TOP VIEW IF YOU ARE UPGRADING FROM THE to the WTC3243: The position of Pin 1 on the is reversed (or mirrored) relative to the position of Pin 1 on the WTC3243.

2 Figure 2 V DD V S BUFB OUTB CGND PGND VS OUTA VDD AGND LIMB LIMA BUFA PI ERR SENS R B R A C L R L R G RT R S Setpoint Trimpot Component Symbol Purpose Page Reference

3 ABSOLUTE MAXIMUM RATINGS RATING SYMBOL VALUE UNIT PARAMETER TEMPERATURE CONTROL TEST CONDITIONS MIN TYP MAX UNITS OUTPUT POWER SUPPLY INPUT THERMAL

4 PIN # PIN NAME FUNCTION IF YOU ARE UPGRADING FROM THE to the WTC3243: The position of Pin 1 on the is reversed (or mirrored) relative to the position of Pin 1 on the WTC3243.

5 Caution: B BB A C

6 1. CONFIGURING HEATING AND COOLING CURRENT LIMITS Table 1 Setting Current Limits Independently Using Trimpots Heat and Cool Current Limits Figure 3 Maximum Output Current (Amps) Figure 4 Maximum Output Current R A, R B R B R B SINGLE TURN TRIMPOT CW CCW W R A R A AGND LIMA LIMB SINGLE TURN TRIMPOT CW CCW W AGND LIMA LIMB

7 2. RESISTIVE HEATER TEMPERATURE CONTROL Figure 5 R B R B - ENABLE DPST SWITCH DISABLE R A - 3. DISABLING THE OUTPUT CURRENT R A AGND LIMA LIMB 4. OPERATING WITH THERMISTOR SENSORS Figure 6 SETPOINT TRIMPOT R S THERMISTOR R T AGND SENS ERR +0.5V SENSOR BRIDGE AMPLIFIER

8 5. USING AN EXTERNAL SETPOINT VOLTAGE WITH THERMISTOR SENSORS Figure 7 1/2LM358 THERMISTOR R T R 1 V IN + - NOTE AGND SENS ERR +0.5V SENSOR BRIDGE AMPLIFIER NOTE: Pin 9 (OUTA) and Pin 13 (OUTB) must be swapped to maintain the proper heating and cooling current polarity through the thermoelectric. Pin 9 (OUTA) becomes the heating current sink and Pin 13 (OUTB) becomes the cooling current sink. Equation 1 Example 1 Figure 8 THERMISTOR V IN + - 1/2LM358 R T Ω AGND SENS ERR Ω +0.5V SENSOR BRIDGE AMPLIFIER

9 6. OPERATING WITH RTD SENSORS Figure 9 RTD SETPOINT TRIMPOT R RTD R 2 R S R AGND SENS ERR +0.5V SENSOR BRIDGE AMPLIFIER Figure USING AN EXTERNAL SETPOINT VOLTAGE WITH RTD SENSORS V IN + - 1/2LM358 RTD R RTD R AGND SENS ERR +0.5V SENSOR BRIDGE AMPLIFIER Equation 2

10 Figure 11 Example 2 Ω V IN + - 1/2LM358 R RTD AGND SENS ERR +0.5V SENSOR BRIDGE AMPLIFIER 8. OPERATING WITH AD590 AND LM335 SENSORS Figure 12 V DD V DD 1μA/Kelvin 10 mv/kelvin AD590 LM335 +V T -V T V T = 1mV/Kelvin Equation 3 +V T SETPOINT RESISTOR R S R 3 -V T 1/2LM AGND SENS ERR +0.5V SENSOR BRIDGE AMPLIFIER

11 Example 3 Figure 13 VDD SETPOINT 1/2 LM358 AD590 RESISTOR 1.5 k RS 10 k 1 A/Kelvin VT = 1 mv/kelvin 1 k AGND SENS ERR +0.5 V SENSOR BRIDGE AMPLIFIER Setpoint Resistance (kohms) RS Setpoint Resistor Temperature (Celsius) 9. MONITORING SETPOINT AND ACTUAL SENSOR VOLTAGES Figure 14 V DD VREF1 R 4 ISENSE = VREF1 R 4 2N3906 2k LM324A R T orr RTD THERMISTOR OR RTD V DD SENSOR VOLTAGE MONITOR 10k 2k LM324B 10k R G R L 5k LM324D C L μ μ VREF2 LM324C 10k SETPOINT VOLTAGE MONITOR 10k 10k 10k SS Note: PTC (Positive Temperature Coeffi cient) 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 AGND SENS ERR PI LIMA +0.5V +1V SENSOR PROPORTIONAL/INTEGRAL BRIDGE CONTROL LOOP AMPLIFIER

12 10. ADJUSTING THE CONTROL LOOP PROPORTIONAL GAIN & INTEGRATOR TIME CONSTANT Equation 4 R k P = 4 ( L ) R G amps / volt Equation 5 R t C = ( G C L 4 ) seconds Equation 6 Ƭ k = k P t C Ƭ Table 2 Sensor Type/ Thermal Load Speed Gain [ k P ] Integrator Time Constant [ t C, seconds ] R G R L C L Thermistor / Fast μf Thermistor / Slow μf RTD / Fast μf RTD / Slow μf AD590 or LM335 / Fast μf AD590 or LM335 / Slow μf

13 11. FINE TUNING R G, R L, AND C L Equation 7 Ƭ k = C L R L Equation 8 Ƭ 4R R G = ( L k ) ohms P Equation 9 Ƭ 4t R G = ( C C) ohms L Ƭ Ω μ

14 12. INCREASING OUTPUT CURRENT DRIVE Table 3 Maximum Output Current (Amps)

15 Figure 15 THERMISTOR R T THERMOELECTRIC + - V S + + V DD NC TEC MASTER CONTROLLER TEC SLAVE CONTROLLER NC NC R G R L RS SETPOINT TRIMPOT C L R A SINGLE TURN SINGLE TURN R B DISABLE SWITCH 1 ENABLE

16 13. HELPFUL HINTS Selecting a Temperature Sensor Table 4 SENSOR RATING Mounting the Temperature Sensor Heatsink Notes Mounting the Thermoelectric

0.07 0.40 1.27 0.48 Weights 0.01 0.31 0.945 4-40 UNC 2 PLS 1.28 1.26 0.100 0.

17 Weights UNC 2 PLS All tolerances are 5%. ASSEMBLED WITH HEATSINK & FAN

CERTIFICATION: NOTICE: WARRANTY: SAFETY: WARRANTY SERVICE: LIFE SUPPORT POLICY: LIMITATIONS OF WARRANTY: EXCLUSIVE REMEDIES: REVISION HISTORY REVERSE ENGINEERING PROHIBITED: REVISION REV. H REV.

18 CERTIFICATION: NOTICE: WARRANTY: SAFETY: WARRANTY SERVICE: LIFE SUPPORT POLICY: LIMITATIONS OF WARRANTY: EXCLUSIVE REMEDIES: REVISION HISTORY REVERSE ENGINEERING PROHIBITED: REVISION REV. H REV. I DATE NOTES REV. J WAVELENGTH ELECTRONICS, INC. 51 Evergreen Drive Bozeman, Montana, phone: (406) Sales/Tech Support fax: (406) sales@teamwavelength.com web: REV. K REV. L REV. M

Solved Problems. Electric Circuits & Components. 1-1 Write the KVL equation for the circuit shown.

Solved Problems. Electric Circuits & Components. 1-1 Write the KVL equation for the circuit shown. Solved Problems Electric Circuits & Components 1-1 Write the KVL equation for the circuit shown. 1-2 Write the KCL equation for the principal node shown. 1-2A In the DC circuit given in Fig. 1, find (i)