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PTCCL13H451FBE Datasheet(PDF) 3 Page - Vishay Siliconix |
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PTCCL13H451FBE Datasheet(HTML) 3 Page - Vishay Siliconix |
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3 / 6 page  PTCCL - 145 V Series www.vishay.com Vishay BCcomponents Revision: 21-Sep-15 3 Document Number: 29086 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 VOLTAGE DERATING AS A FUNCTION OF AMBIENT TEMPERATURE MAXIMUM OVERLOAD CURRENT Iol max. DERATING AS A FUNCTION OF VOLTAGE Iol max. as stated in the electrical data and ordering information tables, is the maximum overload current that may flow through the PTC when passing from the low ohmic to high ohmic state at rated voltage. When other voltages are present after tripping, the Iol max. value can be derived from the above Imax. as a function of voltage graph. Voltages below Vrated will allow higher overload currents to pass the PTC. TYPICAL TRIP-TIME AS A FUNCTION OF TRIP CURRENT RATIO Trip-Time or Switching Time (ts) To check the trip-time for a specific PTC, refer to the Electrical Data and Ordering Information tables for the value Int. Divide the overload or trip current by this Int and you realize the factor It/Int. This rule is valid for any ambient temperature between 0 °C and 70 °C. Adapt the correct non-trip current with the appropriate curve in the Current Deviation as a Function of the Ambient Temperature graph. The relationship between the It/Int factor and the switching time is a function of the PTC diameter; see the above graphs. Example What will be the trip-time at Iol = 0.8 A and Tamb = 0 °C of a thermistor type PTCCL07H211FBE; 12 Ω; Ø Dmax. = 7.0 mm: Int from the table: 210 mA at 25 °C Int: 210 x 1.12 = 235 mA (at 0 °C). Overload current = 0.8 A; factor It/Int: 0.8/0.235 = 3.40. In the typical trip-time as a function of trip current ratio graph, at the 7.0 mm line and It/Int = 3.40, the typical trip-time is 6.0 s. 120 100 40 80 60 0 -25 -50 0 25 50 75 200 T amb (°C) 20 100 125 150 175 100 120 150 200 100 150 80 I ol max. (%) 70 50 40 0 V rated (%) 102 10 1 10-1 t s 12 4 6 8 10 12 14 16 I t/Int 103 (7) (5) (6) (3) (4) (1) (2) Curve 1: Ø Dmax. = 20.5 mm Curve 2: Ø Dmax. = 16.5 mm Curve 3: Ø Dmax. = 12.5 mm Curve 4: Ø Dmax. = 10.5 mm Curve 5: Ø Dmax. = 8.5 mm Curve 6: Ø Dmax. = 7.0 mm Curve 7: Ø Dmax. = 5.0 mm Measured in accordance with “IEC 60738”. |
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