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WHY56ND TEMPERATURE CONTROLLER

SAFE OPERATING AREA

The  Safe  Operating  Area  of  the  WHY56ND  controller  is 

determined by the amount of power that can be dissipated 

within the output stage of the controller. If that power limit is 

exceeded permanent damage can result.

!

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.

www.teamwavelength.com/support/design‑tools/soa‑tc‑calculator/

SOA charts are included in this datasheet for quick reference, 

however we recommend you use the online tools instead.

See our SOA video: 

How to use the Safe Operating Area 

(SOA) Calculator

.

An example SOA calculation for the WHY56ND with heatsink 

and fan is shown in 

Figure 23 

where:

V

S

= 12 Volts (Point C)        V

LOAD

 = 5 Volts

I

LOAD

 = 1 Amp (Point B)         V

DROP 

= 12 ‑ 5 = 7 Volts (Point A)

      

1:  No heatsink required (P

WHY 

< 1.2 W)

      

2:  WHS heatsink required (P

WHY 

< 2 W)

      

3:  Heatsink and 3.5CFM fan required 

 

 

 

 (2 W < P

WHY 

< 9 W)

      

4:  Unsafe Operating Area

  P

WHY 

=Power internally dissipated in the WHY56ND

 

 

1

 

 

2

 

 

3

 

 

4

5

10

15

20

25

0

0

0.5

1.0

1.5

2.0

Voltage Drop Across WHY (VS - V

LOAD

) (

V

)

M

aximum Supply C

ur

ren

t fr

om 

V

S

 (

A

)

25ºC Ambient

75ºC Case

B

BB

A

C

Follow these steps to determine if the controller will be 

operating within the SOA.

• 

Refer to the thermoelectric datasheet to find the maximum 

voltage (V

LOAD

) and current (I

LOAD

) specifications

• 

Calculate the voltage drop across the controller:

   V

DROP

 = V

S

 ‑ V

LOAD

 (V

is the power supply voltage)

•  Mark V

DROP

 on the X‑axis, and extend a line upward

•  Mark I

LOAD

 on the Y‑axis, and extend a line (Line BB) to 

the right until it intersects the V

DROP

 line

• 

On the X‑axis, mark the value of V

S

• 

Extend a diagonal line from V

S

 to the intersection of the 

V

DROP

 and I

LOAD

 lines; this is the Load Line

• 

If the Load Line crosses the Safe Operating Area line at 

any point, the configuration is not safe

If the SOA Calculator indicates the WHY56ND will be outside 

of the Safe Operating Area, the system must be changed 

so that less power is dissipated within the controller. See 

Wavelength Electronics Application Note 

AN-LDTC01: The 

Principle of the Safe Operating Area

 for information on 

shifting the Load Line.

Figure 23.  WHY56ND SOA 

Содержание WHY56ND

Страница 1: ...upply Low Cost 0 005 C 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 Lim...

Страница 2: ...sit the Wavelength Electronics website for the most accurate up to date and easy to use SOA calculator www teamwavelength com support design tools soa tc calculator Figure 1 shows the pin layout and d...

Страница 3: ...electric Cooler TEC or resistive 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 simul...

Страница 4: ...on for the sensor RT and setpoint RS resistors 8 VDD Control Electronics Supply Input Power supply input for the WHY56ND s internal control electronics Supply range input for this pin is 5 to 26 VDC 9...

Страница 5: ...Negative Temperature Coefficient thermistors OUTPUTA provides the heating current to the TEC for NTC sensors Connect OUTPUTA to the positive thermoelectric terminal when using Positive Temperature Co...

Страница 6: ...o Pin 13 Full Temp Range IS 100 mA VS 0 7 VS 0 5 V Compliance Voltage Pin 9 to Pin 13 Full Temp Range IS 1 A VS 1 2 VS 1 0 V Compliance Voltage Pin 9 to Pin 13 Full Temp Range IS 2 A VS 1 6 VS 1 4 V P...

Страница 7: ...tes directly with thermistors or RTD temperature sensors The fundamental operating principle is that the controller adjusts the TEC drive current in order to change the temperature of the sensor that...

Страница 8: ...TRUCTIONS STANDALONE NECESSARY EQUIPMENT The following equipment is required to configure the WHY56ND for basic operation WHY56ND Temperature Controller Thermistor or other temperature sensor Peltier...

Страница 9: ...6 7 Use one of the sensors in the sections listed below SENSOR SELECTION Select a temperature sensor that is responsive around the desired operating temperature The temperature sensor should produce...

Страница 10: ...th reference to Pin 1 AGND If the setpoint resistor RS is larger than the RTD resistance RRTD then the control loop will produce a heating current since the temperature sensed by the RTD is below cool...

Страница 11: ...alues can be fine tuned experimentally Start with component values from Table 5 and operate the temperature controller system to determine if the load temperature settling time is satisfactory If it i...

Страница 12: ...to Pin 1 AGND with a 1 5 k resistor when using RTDs LM335 type and AD590 type temperature sensors with a resistive heater Connect the resistive heater to Pins 9 and 13 to operate INCREASING OUTPUT CU...

Страница 13: ...OLLERS 3 WHY56ND CONTROLLERS 4 WHY56ND CONTROLLERS 5 WHY56ND CONTROLLERS CURRENT LIMIT SET RESISTOR K 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 0 8 1 0 1 78 0 3 0 6 0 9 1 2 1 5 1 87 0...

Страница 14: ...unit will be operating within the internalheat dissipation Safe Operating Area SOA STEP 1 INSTALL WHY56ND ON THE WHY56ND EV WITH HEATSINK AND FAN Match up the notch Figure 12 on the WHY56ND with the...

Страница 15: ...Electronics to use the WHY56ND EV with other sensors or ranges STEP 5 ATTACHING THE VDD AND VS POWER SUPPLIES Ensure that the controller can be safely operated by checking the SOA Calculator website...

Страница 16: ...board 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 position When enabled with this switch i...

Страница 17: ...re configuration may be different than shown Fan can be rotated on the WHY so the location of the wires matches custom PCB WHY56ND and WHY56ND EV assembly instructions Figure 15 Match up the notch sho...

Страница 18: ...perating thermistor resistance RT For example for a 10 k thermistor operating at 25 C choose R1 to be 20 k NOTE Pin 9 OUTA is the heating current sink and Pin 13 OUTB is the cooling current sink Figur...

Страница 19: ...S given a desired operating temperature measured in Celsius Rs 2R3 0 5 273 15 TCelsius 1mV K 10 Resistor R3 is a fixed resistance value that can be used to scale or adjust the setpoint resistor RS Sel...

Страница 20: ...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 5 10 15 20 25 0 0 0 5 1 0 1 5 2 0 Voltage Drop Across WHY VS VLOAD V...

Страница 21: ...VDD VDD VDD VDD VS D1 GREEN VDD VS VDD VS S1 SPST LIM B LIM A SGL TURN SGL TURN CCW 0 AMPS CW 2 AMPS SGL TURN P GAIN I TERM OUT A OUT B SENSOR SENSOR VM1 VM2 VDD VS PGND COMMON OUTA OUTB LIMB LIMA VM2...

Страница 22: ...e at 25 C a 10 k thermistor has a sensitivity of 43 mV C whereas an RTD sensor has a sensitivity of 4 mV C Proportional control term may be set too high Reduce the value of the proportional term For m...

Страница 23: ...24 0 2 PLS 4 40 UNC Airflow Direction MECHANICAL SPECIFICATIONS 0 040 1 02mm Dia Thru Hole 0 060 1 5mm Dia Pad 4 Required All Tolerances are 5 unless noted WEIGHTS WHY56ND 0 6 oz WHS302 Heatsink 0 5...

Страница 24: ...M 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 2...

Страница 25: ...UE PGND 2 ORANGE VS 3 RED VDD 4 BLACK COM 5 WHITE VM1 6 GREEN VM2 CABLING SPECIFICATIONS These cables are included with the WHY56ND EV Evaluation Board WTC3293 00101 INPUT CABLE MOLEX 43645 0400 MICRO...

Страница 26: ...prohibited from reverse engineering decompiling or disassembling this product NOTICE The information contained in this document is subject to change without notice Wavelength will not be liable for e...

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