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W8405 Datasheet(PDF) 4 Page - IXYS Corporation |
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W8405 Datasheet(HTML) 4 Page - IXYS Corporation |
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4 / 11 page  Rectifier Diode Types W8405Z#100 to W8405Z#140 Data Sheet. Types W8405Z#100 to W8405Z#140 Issue 2 Page 4 of 10 July, 2014 5.2 Calculating VF using ABCD Coefficients The forward characteristic IF vs. VF, on page 8 is represented in two ways; (i) the well established VT0 and rT tangent used for rating purposes and (ii) a set of constants A, B, C, D, forming the coefficients of the representative equation for VF in terms of IF given below: F F F F I D I C I B A V ln The constants, derived by curve fitting software, are given below for both hot and cold characteristics. The resulting values for VF agree with the true device characteristic over a current range, which is limited to that plotted. 25°C Coefficients 190°C Coefficients A 0.5426215 A 0.2798311 B 0.05007122 B 0.05544857 C 3.662236×10-5 C 3.989276×10-5 D -1.731167×10-3 D -1.369681×10-3 |
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