抑制浪涌电流负温度系数NTC热敏电阻器.pdf

NTCNTC THERMISTOR2412001500B=lnRT1RT1RT2RT2/()1T1T1T11T2T2T2=lnNTCRtR2525BBTRT1RT2B25(298.15K)50(323.15K),BT1T2TR-TT(K)BBTTB=lnRT1RT1RT2RT2/()1T1T1T11T2T2T2=lnT=1RTDRDTTBT2=T=1RTDRDTTBT2=OUTLINEThis is a Negative Temperature Coefficient Resistor Whoseresistance changes with ambient temperature changes.Thermistor comprises 2or 4 kinds of metal oxides of iron,nickel,cobalt,manganese and copper,being shaped andSintered at high temperature(1200to 1500)Critical Technical Parameters of NTC ThermistorRt-Resistance Value at Zero-powerIts a resistance which is got at a fixed temperature on abasis of a testing power which causes resistance to Vary in arange which can be ignored in relation to the total testing eror.R25-Resistance Value at Rated Zero-powerThe design resistance of the thermistor usually refers to theresistance value got at Zero-power at 25,which is usuallyindicated on the thermistorB ValueBvalue standsforthethermal exponent at a negativetemperature coefficient.lts defined as a ratio of the balancebetween the natural logarithms of resistance values at zero-power to the balance between the reciprocals of the twotemperatures.The formula is as below:Resistance-to-Temperature Coefficient at Zero-powerIt refers to the ratio of changes of a thermistor.Resistancevalue at Zero-powerwhen The temperature,to the resistancevalue at Zero-power The formula is as below:In this formula,stands for the resistance-temperaturecoefficient at Zero-power when the temperature is T:R stands for the resistance value at Zero-power when thetemperature is TT stands for thetemperature(in K)B stands for B valueTIn this formula:Ris the resistance at Zero-power when thetemperature is TRis the resisrtance at Zero-power when the temperature isT Unless otherwise specified,B value is got by calculatingtheZero-powerresistances at 25(298.15K)and50(323.15K).Its not a firm constant within the range ofworking temperature.T11T22149NTCNTC THERMISTOR【南京南山半导体有限公司 风华高科热敏电阻器选型资料【南京南山半导体有限公司 风华高科热敏电阻器选型资料】150,=P/T63.2%C=C/Dissipation CoefficientIts the ratio of the changes with a thermistor dissipation power,inapre-setambienttemperature,tothechangeswiththetemperature.The formula is as below:=P/Tchanges inresponse when the ambient temperaturechanges,withintheranges of the working temperature.APPLICATIONSThermal Time Constant=C/At Zero-power and when amutatio occurs with the temperature,the time t,which is-spent for finishing 63.2%of the gap betweenthe beginning temperature and the ending temperature in thethermistor.is directly proportional toc,the heat capacity of thethermistor,and is inversely proportional to,the dissip ationconstant.That is .UPSmaxMax.steady state current.max.The maximum allowable continuous current passing throughthermistor at 25.Conversion power supply,switch power,UPS power,Kinds of electricheter,electronic energy-saving lamps,electronic ballast etc all kindsof power cicuit proterction of electronic equipments,filament proterctionof CRT,bulb and other lighting lamps.【南京南山半导体有限公司 风华高科热敏电阻器选型资料【南京南山半导体有限公司 风华高科热敏电阻器选型资料】151(NTC)BDIMENSIONS(mm)132AE0.6Remarks:Evalue may be 0.6 for resistors for which the chips diameter is13and the working current is2A.HOW TO ORDERSurge-Arrestor NTC ThermistorFEATURESSmall in size,high-powered,and very capable of bringingdown the surge current;Quick in reaction;High in B value and low in residual current;Long service life and high reliability;High coefficient of safety and wide range of application.Negative Temperature Cofficient Resistor10Resistance Value:1013Diameter of Chip:13NTC10D-13Type(mm)AMAXC1DMAXE0.05FMAXD-20D-15D-13D-11D-92216.514.512.510.57.5/107.57.57.57.5766551.01.00.80.80.844444ADFCED-78.55.050.54NTCNTC THERMISTOR【南京南山半导体有限公司 风华高科热敏电阻器选型资料【南京南山半导体有限公司 风华高科热敏电阻器选型资料】152SPECIFICATIONS&PROPERTIESModelR2520%()(A)Max.Steady-current(A)PowerDissipation coe-fficient(mW/)TimeConstant(s)NTC5D-7NTC8D-7NTC10D-7NTC 16D7NTC22D-7NTC2.5D-9NTC3D-9NTC5D-9NTC8D-9NTC10D-9NTC 16D-9NTC22D-9NTC25D-9NTC35D-9NTC 50D-9NTC60D-9NTC80D-9NTC100D-9NTC120D-9NTC200D-9NTC300D-9NTC2.5D-11NTC3D-11NTC5D-11NTC8D-11NTC 10D-11NTC 16D-11NTC2.5D-13NTC3D-13NTC5D-13NTC10D-13NTC 16D-13NTC 3D-15NTC 4D-15NTC5D-15NTC8D-15NTC 10D-15581016222.535810162225355060801001202003002.535810162.53510163458100.2410.4360.5720.8971.0830.1280.1330.2360.3820.4670.6880.8990.9141.1031.2651.5212.1082.5763.1155.9009.1500.1200.1260.2280.3010.3950.4880.0990.1120.1360.2710.3680.0940.1280.1320.1960.25510999811111111111111121211111111111010131313131414131415151618202020203028272727353535343432303030303030303032324645454547506060686560767676808521.510.70.6443221111110.80.80.80.50.55543326654376655()Approx R ofMax.Cur.()NTC8D-1380.25615654NTC 16D-15160.30719774NTC 3D-2030.079241008NTC 5D-2050.10623877NTC 8D-2080.157231056NTC 10D-20100.194231186【南京南山半导体有限公司 风华高科热敏电阻器选型资料【南京南山半导体有限公司 风华高科热敏电阻器选型资料】