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F1206B3R00FSTR Datasheet(PDF) 11 Page - AVX Corporation |
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F1206B3R00FSTR Datasheet(HTML) 11 Page - AVX Corporation |
11 / 12 page Accu-Guard® SMD Thin-Film Fuse Thus, for current pulse in Figure 3b, the Joule integral is: {(0.56A)2+0.56A x (1A-0.56A)+ [(1A-0.56A)2]} x 3 x 10-3s = 1.9 x 10-3A2sec. Fig. 3a. Trapezoidal pulse parameters for Joule integral calculation, example #3. 4. Lightning strike A lightning strike pulse is shown in Figure 4a. After an initial linear rise, the current declines exponentially. 3. Trapezoidal current pulse The Joule integral for a trapezoidal pulse is [(Imin.)2 + Imin. x (Imax. - Imin.) + (Imax-Imin)2] x t, 3 see Fig. 3a. t l min. l max. 0.5 msec/div 0.5A/div Fig. 3b. Trapezoidal pulse, example #3. According to the I2t graph on page 6, the 0.5A fuse should be chosen for this application, see Figure 3c. FUSE PRE-ARCING JOULE INTEGRALS vs. PRE-ARCING TIME 0.50A PRE-ARCING TIME l2t, A2 sec PRE-ARCING TIME, sec 100 10 1 10-1 10-2 10-3 10-4 10-5 10-7 10-6 10-5 10-4 10-3 10-2 10-1 110 x Fig. 3c. Choice of 0.5A fuse, example #3. Pre-arcing I2t Maximum I2t design rule I2t for sample switch-on pulse X X DESIGNING FOR CURRENT PULSE SITUATIONS (CONT.) Joule integral for the linear current rise is calculated as for a triangular pulse, see example #2. The Joule integral for the exponential decline is I max. 2 x t 0.5 x (-1/2In 0.5) = 0.72Imax.2 x t0.5 Thus, for the sample lightning strike pulse in Figure 4b, the total Joule integral is: (25A)2 x 2 x 10-6sec/3+0.72 x (25A)2 x 10 x 10-6sec = 4.92 x 10-3A2sec. t0.5 0.51 max. l max. Fig. 4a. Lightning pulse parameters for Joule integral calculation, example #4. 10 μsec/div 5A/div Fig. 4b. Lightning strike pulse, example #4. For practical calculations, the duration of exponential decline may be assumed to be 3t 0.5, because within this time 98.5% of the pulse energy is released. Thus, the total pulse duration in this example is 30 μsec, and the 1.25A fuse should be chosen for this application, see Figure 4c. FUSE PRE-ARCING JOULE INTEGRALS vs. PRE-ARCING TIME Fig. 4c. Choice of 0.5A fuse, example #4. Pre-arcing I2t Maximum I2t design rule I2t for sample switch-on pulse 1.25A PRE-ARCING TIME l2t, A2 sec PRE-ARCING TIME, sec 100 10 1 10-1 10-2 10-3 10-4 10-5 10-7 10-6 10-5 10-4 10-3 10-2 10-1 110 x 3 |
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