ptcll www.vishay.com vishay bccomponents revision: 30-nov-15 1 document number: 29071 for technical questions, contact: nlr@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 ptc thermistors, time delay for lighting description positive temperature coeffi cient (ptc) thermistors for overload protection have proved to be the ideal electronic ballast component for increased lamp life-time. when the rectified mains is firs t applied, the ptc thermistor is cold, so its resistance is low. the lamp voltage will be below the necessary ignition va lue, so the current will flow through the cathodes, heating them to their emission temperature. at the same time, the ptc thermistor will heat up to its switch temperature, whereupon its resistance will rise rapidly, allowing the lamp voltage to reach its ignition value and light the lamp. once the lamp is lit, the cathodes are fed by a high-frequency lamp supply, to avoid flicker and improve efficiency. the ptc thermistor plays no further part until the lamp is switched off, whereupo n it is ready to resume its smooth-starting function. we supply a range of lightin g ptc thermistors for this application offering a wide ch oice of voltage and switch times. features ? reliable lamp starting , due to well defined inrush-current gene rated time delay ? accurate resistance for ease of circuit design ? small size and durable ? available bulk-packe d or taped-on-reel ? long life: more than 20 000 starts for a 20 w cfl lamp ? material categorization: fo r definitions of compliance please see www.vishay.com/doc?99912 applications fluorescent lighting and lighting ballasts for: ? cfl 5 to 25 w range ? tl hf-ballasts mounting the leads are suitable for so ldering in any position. the lacquer may cover the leads up to 1.0 mm from the seating plane. notes (1) ignition time of the lamp approx imately equals th e tripping time. (2) specific for cfl lamp electronic starter. (3) specific for hf-tl ballast. (4) highest lamp ignition voltage should be smaller than the maximum allowable peak voltage. quick reference data parameter value unit rated voltage (rms) 80 to 200 v rms nominal switching current 150 to 500 ma resistance at 25 c ( r 25 ) 100 to 625 tolerance on r 25 value 20 to 30 % maximum overload current i ol 0.5 to 1.0 a tripping time 0.3 to 1 s operating temperature range at rated voltage -20 to 105 c electrical data and ordering information r 25 ( ) switch temperature (c) maximum peak voltage (4) (v peak ) typical (1) trip time at 25?c catalog number min. max. t trip (s) at?i t (ma) sap coding 500 750 110 700 0.4 200 ptcll05p131tbe (2) 185 300 120 700 0.5 300 ptcll05p211tte (2) 75 125 80 700 0.7 300 ptcll05p251tte (2) 225 375 105 900 0.75 300 PTCLL07P261VTE (3) 75 125 105 1 000 0.85 500 ptcll07p421wte (3)
ptcll www.vishay.com vishay bccomponents revision: 30-nov-15 2 document number: 29071 for technical questions, contact: nlr@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 typical electronic ballast circuit dimensions in millimeters d max. t max. h 3 l 1 weight (g) figures packaging spq material ordering number 5.4 4.5 10 3.5 0.5 0.33 fig. 1 bulk 500 ptcll05p131tbe 5.4 4.5 9 - 0.45 fig. 2 on tape 1500 ptcll05p211tte 5.4 4.5 10 - 0.45 fig. 2 on tape 1500 ptcll05p251tte 7.0 5.0 12 - 0.66 fig. 2 on tape 1500 PTCLL07P261VTE 7.0 5.0 12 - 0.66 fig. 2 on tape 1500 ptcll07p421wte tape and other device dimensions in millimeters according ie c 60286 for ta pe on reel symbol parameter dimensions tolerance d lead diameter 0.6 0.05 p pitch between thermistors 12.7 1 f lead to lead distance guaranteed between component and tape 5 +0.5 / -0.2 h 2 component body to seating plane 4 1 h 0 lead-wire clinch height 16 0.5 ptc thermistor 36 khz lamp supply rectified mains (310 v dc for 230 v ac mains) fluorescent lamp c c c fet switch l fet switch cathode cathode d t l 1 h 3 h 2 f d ? p t h 2 h 3 ? h l d p 0 p 1 fd 0 w 0 w 2 w 1 w p t t h 1 h 0 ? p d ? h
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