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IRF6710S2PBF Arkusz danych(PDF) 6 Page - International Rectifier |
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IRF6710S2PBF Arkusz danych(HTML) 6 Page - International Rectifier |
6 / 10 page IRF6710S2TR/TR1PbF 6 www.irf.com Fig 16. Typical Avalanche Current Vs.Pulsewidth Fig 17. Maximum Avalanche Energy vs. Temperature Notes on Repetitive Avalanche Curves , Figures 16, 17: (For further info, see AN-1005 at www.irf.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 asTjmax is not exceeded. 3. Equation below based on circuit and waveforms shown in Figures 19a, 19b. 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 16, 17). tav = Average time in avalanche. D = Duty cycle in avalanche = tav ·f ZthJC(D, tav) = Transient thermal resistance, see figure 11) PD (ave) = 1/2 ( 1.3·BV·Iav) = DT/ ZthJC Iav = 2 DT/ [1.3·BV·Zth] EAS (AR) = PD (ave)·tav 1.0E-06 1.0E-05 1.0E-04 1.0E-03 1.0E-02 1.0E-01 tav (sec) 0.01 0.1 1 10 100 0.05 Duty Cycle = Single Pulse 0.10 Allowed avalanche Current vs avalanche pulsewidth, tav, assuming ∆Τ j = 25°C and Tstart = 150°C. 0.01 Allowed avalanche Current vs avalanche pulsewidth, tav, assuming ∆Tj = 150°C and Tstart =25°C (Single Pulse) 25 50 75 100 125 150 175 Starting TJ , Junction Temperature (°C) 0 10 20 30 TOP Single Pulse BOTTOM 1% Duty Cycle ID = 10A |
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