AUIRL7732S2TR 30 Notes on Repetitive Avalanche Curves , Figures 16, 17: TOP Single Pulse (For further info, see AN-1005 at www.infineon.com) BOTTOM 1.0% Duty Cycle 25 1. Avalanche failures assumption: )J ID = 35A Purely a thermal phenomenon and failure occurs at a temperature far in m( y excess of Tjmax. This is validated for every part type. gr 20 e 2. Safe operation in Avalanche is allowed as long as Tjmax is not exceeded. n E 3. Equation below based on circuit and waveforms shown in Figures 18a, 18b. eh 15 4. PD (ave) = Average power dissipation per single avalanche pulse. cna 5. BV = Rated breakdown voltage (1.3 factor accounts for voltage increase lav during avalanche). A 10 , 6. Iav = Allowable avalanche current. R A 7. T = Allowable rise in junction temperature, not to exceed Tjmax (assumed as E 5 25°C in Figure 16, 17). tav = Average time in avalanche. D = Duty cycle in avalanche = tav ·f 0 ZthJC(D, tav) = Transient thermal resistance, see Figures 15) 25 50 75 100 125 150 175 Starting TJ , Junction Temperature (°C) PD (ave) = 1/2 ( 1.3·BV·Iav) = T/ ZthJCIav = 2 T/ [1.3·BV·Zth]Fig 17. Maximum Avalanche Energy vs. Temperature EAS (AR) = PD (ave)·tavFig 18a. Unclamped Inductive Test Circuit Fig 18b. Unclamped Inductive Waveforms VDD Fig 19a. Gate Charge Test Circuit Fig 19b. Gate Charge Waveform Fig 20a. Switching Time Test Circuit Fig 20b. Switching Time Waveforms 7 2015-12-11
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