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AUIRF7749L2 Datasheet(PDF) 7 Page - International Rectifier |
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AUIRF7749L2 Datasheet(HTML) 7 Page - International Rectifier |
7 / 12 page AUIRF7749L2TR 7 www.irf.com © 2015 International Rectifier Submit Datasheet Feedback August 10, 2015 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 as Tjmax is not exceeded. 3. Equation below based on circuit and waveforms shown in Figures 18a, 18b. 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 Figures 15) PD (ave) = 1/2 ( 1.3·BV·Iav) = T/ ZthJC Iav = 2T/ [1.3·BV·Zth] EAS (AR) = PD (ave)·tav Fig 17. Maximum Avalanche Energy vs. Temperature Fig 18a. Unclamped Inductive Test Circuit Fig 18b. Unclamped Inductive Waveforms Fig 19a. Gate Charge Test Circuit Fig 19b. Gate Charge Waveform VDD Fig 20a. Switching Time Test Circuit Fig 20b. Switching Time Waveforms 25 50 75 100 125 150 175 Starting TJ , Junction Temperature (°C) 0 50 100 150 200 250 300 350 TOP Single Pulse BOTTOM 1.0% Duty Cycle ID = 120A |
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