PTC Thermistors POSISTOR® Application Manual 2008 by Murata Manufacturing Co.,Ltd.

More catalogs by Murata Manufacturing Co.,Ltd. | PTC Thermistors POSISTOR® Application Manual 2008 | 15 pages | 2013-07-26

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!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 posistor® application and variety list over current protection application target device chip type prg k k k lead type ptgl kkkkk overheat sensing chip type prf k k k lead type ptfl ptfm k k k temp compensation lead type ptrl k heater contact type ptwsb ptwta hot air type ptwh motor starter case type pth6m pth7m pthtm av equipment information equipment communications equipment car electronics home electronics household equipment power supply plasma tv lcd tv

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 2 the basic design data 1 resistance temperature characteristics the posistor® has resistance temperature characteristics that cause its resistance to exponentially increase when the part s temperature exceeds its curiepoint cp the critical temperature where the resistance value increases dramatically typically above the cp the resistance of posistor increase at rate of 15 to 60 per degc there are many kinds of cp available from 40degc to 280degc as shown

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 the basic design data 2 2 voltage current characteristics static characteristics the posistor® can be used as a constant temperature heater with an automatic temperature adjustment function and can maintain constant wattage even over voltage fluctuation if the current through the posistor is maintained above its maximum current point the posistor can provide over-current protection if it is connected in series in a circuit if current through the posistor is

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 2 the basic design data 3 current time characteristics dynamic characteristics if a specific voltage above the v-i chart s maximum current point is applied to the posistor® a large amount of current will flow through posistor because its resistance is low the posistor will start to self-heat due to the current and over a period of time the temperature of the posistor will exceed the cp and its resistance will sharply increase due to this the current will

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 3 structure of posistor® leaded products of posistor as shown in fig 8 can have their posistor element either soldered to lead wires and its surface then coated with epoxy resin or the element can be held in place by spring terminals and encased in a plastic housing in the case of the latter the spring terminals also provide the electrical connection and exit the housing as lead terminals the shape of the posistor can either be square or round recently chip

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 4 practical applications of posistor® 1 heating automatic temperature adjustment heater 1 for general heater posistor can be used as a constant temperature heater that is self-regulating it does not need a thermostat to control temperature and inherently protects against abnormal temperature rise and failure constant temperature can be maintained by the varying applied voltage !general heaters !applications electric rice cooker electric pot hot plate

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 practical applications of posistor® 4 2 for temperature sensor and temperature compensation 1 for temperature compensation and overheat sensing of transistors fig 121 shows a basic circuit for temperature compensation in biasing the transistor the resistance of posistor is used if the transistor overheats the posistor will heat up as well as the posistor passes the cp it will go high resistance and unbiased the circuit and turning off the transistor in case

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 4 practical applications of posistor® 3 for temperature indication fig 14 shows most simple example of a temperature indicator temperature is sensed by posistor if the target temperature is exceeded determined by which posistor is used a neon tube lights up 100v 60hz 20k 1 2 posistor posistor neon lamp neon lamp 100v 60hz 20k fig 14 temperature indication by posistor ptgl ptrl 4 for temp indication overheat protection

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 practical applications of posistor® 4 3 for current control 1 over current protection if a circuit s current limit is exceed a posistor can react to the higher current self heating and quickly protect the circuit fig 15 100k 10k rl transistor 1 -b posistor 0.1µf 100k 10k posistor rl -b motor 2 posistor motor power source 2.2 10µf m posistor 75 power source 160v power source 30µf power circuit 3 posistor 27 160v 30µf coaxial cable t.v antenna booster

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf 08.9.25 5 terms definitions of typical terms for posistor®s are listed here 1 initial resistance r25 this is the part s resistance value at 25degc which is measured under conditions of 1.0vdc or less and 10ma or less without self-heating 2 curie point c.p temperature resistance temperature characteristics a posistor maintains almost the same resistance until certain temperature after this temperature is exceeded the resistance of posistor rises up sharply this

!note · this pdf catalog is downloaded from the website of murata manufacturing co ltd therefore it s specifications are subject to change or our products in it may be discontinued without advance notice please check with our sales representatives or product engineers before ordering · this pdf catalog has only typical specifications because there is no space for detailed specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering r16e.pdf