SEMICONDUCTOR SENSOR APPLICATION NOTE 2001-02-20 General App

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SEMICONDUCTOR SENSOR APPLICATION NOTE 2001-02-20 General App

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T001
SEMICONDUCTOR SENSOR APPLICATION NOTE
2001-02-20
General Application Note Infineon's KTYxx-Series
Introduction: some customers` applications necessary modify values characteristics their temperature measurement circuitry. following note describes this done lists some typical questions their solutions. change between selection groups KTYxx Selection group KTY1x KTY1x KTY1x KTY2x KTY2x KTY2x Available tolerance group shift from KTY1x-5 KTY1x-6 KTY1x-6 KTY1x-7 KTY1x-5 KTY1x-7 KTY1x-7 KTY1x-6 KTY1x-7 KTY1x-5 KTY1x-6 KTY1x-5 Supplement resistor (Ohm) 135k 131k Resistance values (Ohm) Regarding E48-Series 30.1 30.1 59.0 133.0k 68.1k 133.0k Arrangement Series Series Series Parallel Parallel Parallel Average Resistance ()at room temperature 25°C) 1970 2000 2030 1000 1015
Figure Overview recommended supplementary resistors curve shift room temperature KTY1x-series
Infineon Semiconductor Sensor Group
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T001
SEMICONDUCTOR SENSOR APPLICATION NOTE
2001-02-20
recommend metal resistors E48-Series with accuracy least ±2%.
Figure Configuration example supplementary resistor arranged series, parallel. resistance KTY-sensor calculated various temperatures from following equation: RKTY: Resistance value sample temperature R25: Resistance value (room temperature) Deviation sample temperature reference temperature 7.88 1.937
RKTY
KKTY: Temperature coefficient
Infineon Semiconductor Sensor Group
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T001
SEMICONDUCTOR SENSOR APPLICATION NOTE
2001-02-20
When using serial configuration resulting resistance value determined RKTY
Resulting resistance value Serial resistor
Example: Calculation shift from KTY10-6 KTY10-7 characteristic: RKTY10-6 2000 30.1 (E48-series), neglected
Target temperature: 80°C RKTY10-6 2984.2 (nominal value) 30.1
R(80°C 2984.2 30.1 3014.3
RKTY 10-7 (80°C 3028.7
This Resistor value dedicated application temperatures close room temperature. more temperature deviates from room temperature, more resistance value varying from nominal KTY10-7 curve. minimize error resistance, advantageous value close target temperature resistance center working temperature band
RKTY 10-7 RKTY 10-6(TA
here: 3028.7 2984.2 44.5 (44.2 according E48)
Infineon Semiconductor Sensor Group
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T001
SEMICONDUCTOR SENSOR APPLICATION NOTE
2001-02-20
error modified KTY10-6-curve KTY10-7 obtained (average resistance values)
RKTY 10-7 100% 10-7
R(kty10-6) [ohm] R(kty10-7) [ohm] error
5000 4500 4000 resistance (ohm) 3500 3000 2500 2000 1500 1000
0,80 0,60 0,40 0,20 0,00 -0,20 -0,40 -0,60 -0,80 -1,00 -1,20 error
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temperature (°C)
Figure Error temperature with serial resistor optimized target temperature 80°C
Infineon Semiconductor Sensor Group
T001
SEMICONDUCTOR SENSOR APPLICATION NOTE
2001-02-20
case parallel arrangement resistance value obtained
RKTY RKTY
Parallel resistor
Example: Calculation shift from KTY10-6 KTY10-5 characteristic, optimized target temperature 80°C: RKTY10-6 2000
RKTY 10-6 RKTY 10-5 RKTY 10-6 RKTY 10-5
RKTY10-6(80°C) 2984.2 RKTY10-5(80°C) 2939.2 RP(80°C) 194.9 (196.0 according Series)
error modified KTY10-6-curve KTY10-5 obtained (average resistance values)
RKTY 10-5 100% RKTY 10-5
Infineon Semiconductor Sensor Group
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T001
SEMICONDUCTOR SENSOR APPLICATION NOTE
2001-02-20
5000 4500 4000 3500 3000 2500 2000 1500 1000
R(kty10-6) [ohm] r(kty10-5) [ohm] error
temperature (°C)
-0,2 -0,4 -0,6 -0,8 -1,0 -1,2
resistance (ohm)
Figure Error temperature with parallel resistor optimized target temperature 80°C
Infineon Semiconductor Sensor Group
error
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T001
SEMICONDUCTOR SENSOR APPLICATION NOTE
2001-02-20
change mechanically from KTY10-Series KTY11-Series? following points have considered: Primarily, this means changeover from larger TO-92 Package smaller TO-92 Mini housing. details (packaging dimensions) please refer KTYdatasheets. resistance tolerance temperature dependance same Thermal time constant decreases typically from 40sec. sec. from 4sec. sec.
electrical isolating thermal sufficiently conducting materials (e.g.Ceramics)
TO-92
TO-92 Mini
Figure Cross section feasable thermal coupling components (cylindric parts) high voltage applications according (Association Electrical, Electronic Information Technologies) prohibited electrically conducting materials distance less than next connection wires temperature sensor. This with regard limited breakdown voltage. Therefore, additional isolation will required. Because longer thermal time constant TO-92 package many cases necessary aluminium sleeve give sufficient thermal coupling. decreased thermal time constant shrunk (TO-92 TO-92 Mini package would possible electrically isolating materials hence fullfill requirements.
Infineon Semiconductor Sensor Group
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T001
SEMICONDUCTOR SENSOR APPLICATION NOTE
2001-02-20
modify lead-wire spacing from TO-92 Mini TO-92 package? based applications necessary modify pitch between leads. easily performed bending them like shown figure below.
TO-92
TO-92 Mini
TO-92 Mini adapted TO-92
2,54
2,54
Figure cross section TO-92 packages TO-92 Mini adaption scheme
Infineon Semiconductor Sensor Group
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SEMICONDUCTOR SENSOR APPLICATION NOTE 2001-02-20 General App

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