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PRF18BE471QB5RB Datasheet(PDF) 8 Page - Murata Manufacturing Co., Ltd. |
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PRF18BE471QB5RB Datasheet(HTML) 8 Page - Murata Manufacturing Co., Ltd. |
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8 / 104 page  R90E.pdf Sep.24,2012 !Note • Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. 6 Technical Terms Load Curve of Circuit and Voltage - Current Characteristics of POSISTOR r 1. Protective Threshold Current The maximum current value is called the "Protective Threshold Current" for Voltage vs. Current characteristics (static). When smaller than the protective threshold current flows in POSISTOR r, it reaches its stability (as shown in figure on right) at the intersection (A) of the load curve (a) and voltage-current characteristics of POSISTOR r(c). And POSISTOR r works as a normal fixed resistor. However, when larger than protective threshold current flows, it stabilizes at the intersection (B) with the load curve (b). 2. Protective Threshold Current Range Protective threshold current varies depending on the ambient temperature, resistance value, temperature characteristics and shape. (see Figure on right) The maximum value of trip current and the minimum value of the hold current are in the range of ambient temperature -10 to +60°C. That is, when a current is smaller than the hold current, POSISTOR r works only as a fixed resistor. When larger than the trip current flows, however, POSISTOR r protects the circuit from overload. 3. Operating Time A period starting from the voltage input to the moment current itself sharply attenuates is called "Operating Time." Conventionally, operation time (t0) is determined to be the period until inrush current (I0) decreases to a level one half the original inrush current (I0/2). E RL Vp I I = E - Vp RL Load curve in normal state (normal current) Load curve in abnormal state (abnormal current) Voltage-current characteristics of POSISTOR r a b c c a b A B E Voltage (log) Protective Threshold Current Range 1000 800 600 400 200 0 -20 0 20 40 60 Ambient Temperature (°C) Protective Threshold Current Hold Current Trip Current Operating Current I0 I0 2 Time (sec.) t 0 Operating Time Basic Characteristics of POSISTOR r |
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