전자부품 데이터시트 검색엔진 |
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IRF7748L1PBF 데이터시트(PDF) 6 Page - International Rectifier |
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IRF7748L1PBF 데이터시트(HTML) 6 Page - International Rectifier |
6 / 10 page 6 www.irf.com © 2012 International Rectifier February 18, 2013 IRF7748L1TRPbF Fig 17. Peak Diode Recovery dv/dt Test Circuit for N-Channel HEXFET® Power MOSFETs 25 50 75 100 125 150 175 Starting TJ , Junction Temperature (°C) 0 20 40 60 80 100 120 140 TOP Single Pulse BOTTOM 1.0% Duty Cycle ID = 89A Fig 15. Typical Avalanche Current vs. Pulse width Notes on Repetitive Avalanche Curves , Figures 15, 16: (For further info, see AN-1005 ) 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 15, 16). 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) = T/ ZthJC Iav = 2T/ [1.3·BV·Zth] EAS (AR) = PD (ave)·tav Fig 16. Maximum Avalanche Energy vs. Temperature 1.0E-06 1.0E-05 1.0E-04 1.0E-03 1.0E-02 1.0E-01 tav (sec) 0.1 1 10 100 1000 Allowed avalanche Current vs avalanche pulsewidth, tav, assuming j = 25°C and Tstart = 150°C. Allowed avalanche Current vs avalanche pulsewidth, tav, assuming Tj = 150°C and Tstart =25°C (Single Pulse) 0.10 0.01 0.05 Duty Cycle = Single Pulse |
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