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IRF1407SPBF Arkusz danych(PDF) 7 Page - Infineon Technologies AG |
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IRF1407SPBF Arkusz danych(HTML) 7 Page - Infineon Technologies AG |
7 / 12 page IRF1407S/LPbF 7 2016-5-26 Fig 15. Typical Avalanche Current vs. Pulse width Notes on Repetitive Avalanche Curves , Figures 15, 16: (For further info, see AN-1005 at www.infineon.com) 1. Avalanche failures assumption: Purely a thermal phenomenon and failure occurs at a temperature far in excess of Tjmax. This is validated for every part type. 2. Safe operation in Avalanche is allowed as long as Tjmax is not exceeded. 3. Equation below based on circuit and waveforms shown in Figures 12a, 12b. 4. PD (ave) = Average power dissipation per single avalanche pulse. 5. BV = Rated breakdown voltage (1.3 factor accounts for voltage increase during avalanche). 6. Iav = Allowable avalanche current. 7. T = Allowable rise in junction temperature, not to exceed Tjmax (assumed as 25°C in Figure 15, 16). tav = Average time in avalanche. D = Duty cycle in avalanche = tav ·f ZthJC(D, tav) = Transient thermal resistance, see Figures 13) PD (ave) = 1/2 ( 1.3·BV·Iav) = T/ ZthJC Iav = 2T/ [1.3·BV·Zth] EAS (AR) = PD (ave)·tav Fig 16. Maximum Avalanche Energy vs. Temperature 1.0E-07 1.0E-06 1.0E-05 1.0E-04 1.0E-03 1.0E-02 1.0E-01 tav (sec) 1 10 100 1000 0.05 Duty Cycle = Single Pulse 0.10 Allowed avalanche Current vs avalanche pulsewidth, tav assuming Tj = 25°C due to avalanche losses 0.01 25 50 75 100 125 150 175 Starting TJ , Junction Temperature (°C) 0 100 200 300 400 TOP Single Pulse BOTTOM 10% Duty Cycle ID = 78A |
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