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IRF135SA204 Arkusz danych(PDF) 6 Page - International Rectifier |
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IRF135SA204 Arkusz danych(HTML) 6 Page - International Rectifier |
6 / 11 page 6 www.irf.com © 2015 International Rectifier Submit Datasheet Feedback September 17, 2015 IRG5K50P5K50PM06E IRF135SA204 Fig 14. Maximum Effective Transient Thermal Impedance, Junction-to-Case Notes on Repetitive Avalanche Curves , Figures 15, 16: (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 23a, 23b. 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 14) 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 Fig 15. Avalanche Current vs. Pulse Width 1E-006 1E-005 0.0001 0.001 0.01 0.1 t1 , Rectangular Pulse Duration (sec) 0.0001 0.001 0.01 0.1 1 0.20 0.10 D = 0.50 0.02 0.01 0.05 SINGLE PULSE ( THERMAL RESPONSE ) Notes: 1. Duty Factor D = t1/t2 2. Peak Tj = P dm x Zthjc + Tc 25 50 75 100 125 150 175 Starting TJ , Junction Temperature (°C) 0 100 200 300 400 500 600 700 TOP Single Pulse BOTTOM 1.0% Duty Cycle ID = 96A 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 Duty Cycle = Single Pulse 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) 0.01 0.05 0.10 |
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