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PTCEL13R251NBE Datasheet(PDF) 2 Page - Vishay Siliconix |
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PTCEL13R251NBE Datasheet(HTML) 2 Page - Vishay Siliconix |
2 / 5 page PTCEL www.vishay.com Vishay BCcomponents Revision: 31-May-16 2 Document Number: 29165 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 OUTLINE AND DIMENSIONS in millimeters REQUIRED NUMBER OF PTC THERMISTORS TO LIMIT CURRENT AND ABSORB ENERGY By using several PTC’s in a series / parallel network, the maximum current limitation and absorbed energy levels can be further optimized. For homogeneous current and energy distribution it is recommended to combine only PTCEL of the same size and matched resistance value. Energy absorption per PTC in a network depends on current distribution in the network and as such on the individual PTC resistance value. PTCEL thermistors might be used in a series connection to further lower the inrush current, but not to increase the maximum allowed voltage levels. Following formula may be used to calculate the minimum number of PTCEL thermistors required in a DC link or other capacitor bank application to properly charge or discharge a given amount of energy without follow current: N Notes • N is the number of PTCEL required in the network. • C is the total capacitor value to charge or discharge in F. • V is the maximum DC voltage on the capacitor C. •Cth is the thermal capacity of one PTC in [J/K] (see table). •Tsw is the minimum switching temperature of the PTCEL (130 °C). •Tamb is the maximum ambient temperature at which the PTC needs to operate. H2 H3 L1 d F DT COMPONENT DIMENSIONS in millimeters PTCEL13 PTCEL17 D 13 max. 17 max. H1 17 max. 21 max. H2 3 ± 1 3 ± 1 d 0.6 ± 0.06 0.8 ± 0.08 L1 20 min. 20 min. F 5 ± 0.8 5 ± 0.8 T 7.0 max. 7.5 max. C x V 2 2 x C th x T sw - Tamb --------------------------------------------------------------- |
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