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AUIRF7669L2TR Datasheet(PDF) 7 Page - International Rectifier |
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AUIRF7669L2TR Datasheet(HTML) 7 Page - International Rectifier |
7 / 11 page AUIRF7669L2TR/TR1 www.irf.com 7 Fig 17. Maximum Avalanche Energy vs. Temperature Notes on Repetitive Avalanche Curves , Figures 13, 14: (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 16a, 16b. 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. ΔT = 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 figure 11) PD (ave) = 1/2 ( 1.3·BV·Iav) = DT/ ZthJC Iav = 2 DT/ [1.3·BV·Zth] EAS (AR) = PD (ave)·tav Fig 18b. Unclamped Inductive Waveforms Fig 18a. Unclamped Inductive Test Circuit tp V(BR)DSS IAS RG IAS 0.01 Ω tp D.U.T L VDS + - VDD DRIVER A 15V 20V VGS Fig 19a. Gate Charge Test Circuit Fig 19b. Gate Charge Waveform VDS 90% 10% VGS td(on) tr td(off) tf VDS Pulse Width ≤ 1 µs Duty Factor ≤ 0.1 % RD VGS RG D.U.T. 10V + - VDD Fig 20a. Switching Time Test Circuit Fig 20b. Switching Time Waveforms Vds Vgs Id Vgs(th) Qgs1 Qgs2 Qgd Qgodr 1K VCC DUT 0 L S 20K 25 50 75 100 125 150 175 Starting TJ , Junction Temperature (°C) 0 50 100 150 200 250 300 TOP Single Pulse BOTTOM 1.0% Duty Cycle ID = 68A |
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