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IRF6619 Arkusz danych(PDF) 6 Page - International Rectifier |
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IRF6619 Arkusz danych(HTML) 6 Page - International Rectifier |
6 / 9 page IRF6619 6 www.irf.com Fig 15. Maximum Avalanche Energy vs. Temperature Notes on Repetitive Avalanche Curves , Figures 14, 15: (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 17a, 17b. 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 14, 15). tav = Average time in avalanche. D = Duty cycle in avalanche = tav ·f ZthJC(D, tav) = Transient thermal resistance, see Figures 3) PD (ave) = 1/2 ( 1.3·BV·Iav) = DT/ ZthJC Iav = 2DT/ [1.3·BV·Zth] EAS (AR) = PD (ave)·tav Fig 19a. Switching Time Test Circuit Fig 19b. Switching Time Waveforms V GS V DS 90% 10% t d(on) t d(off) t r t f Fig 17b. Unclamped Inductive Waveforms Fig 17a. Unclamped Inductive Test Circuit tp V(BR)DSS IAS Fig 18a. Gate Charge Test Circuit Fig 18b. Gate Charge Waveform Vds Vgs Id Vgs(th) Qgs1 Qgs2 Qgd Qgodr D.U.T. VDS ID IG 3mA VGS .3 µF 50K Ω .2 µF 12V Current Regulator Same Type as D.U.T. Current Sampling Resistors + - Fig 16. Maximum Avalanche Energy Vs. Drain Current 25 50 75 100 125 150 Starting TJ, Junction Temperature (°C) 0 200 400 600 800 1000 I D TOP 12A 15A BOTTOM 24A V GS Pulse Width < 1µs Duty Factor < 0.1% V DD V DS L D D.U.T + - R G IAS 0.01 Ω tp D.U.T L VDS + - VDD DRIVER A 15V 20V VGS 25 50 75 100 125 150 Starting TJ , Junction Temperature (°C) 0 100 200 300 Single Pulse ID = 24A |
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Podobny opis - IRF6619 |
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