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IRF2907S Datasheet(Arkusz danych) 7 Page - International Rectifier

Numer części IRF2907S
Szczegółowy opis  AUTOMOTIVE MOSFET
Pobierz  12 Pages
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Producent  IRF [International Rectifier]
Strona internetowa  http://www.irf.com
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 7 page
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IRF2907Z/S/L
www.irf.com
7
Fig 15. Typical Avalanche Current Vs.Pulsewidth
Fig 16. Maximum Avalanche Energy
vs. Temperature
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 12a, 12b.
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 figure 11)
PD (ave) = 1/2 ( 1.3·BV·Iav) =
DT/ ZthJC
Iav = 2DT/ [1.3·BV·Zth]
EAS (AR) = PD (ave)·tav
1.0E-05
1.0E-04
1.0E-03
1.0E-02
1.0E-01
tav (sec)
1
10
100
0.05
Duty Cycle = Single Pulse
0.10
Allowed avalanche Current vs
avalanche
pulsewidth,
tav
assuming
∆ Tj = 25°C due to
avalanche losses
0.01
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% Duty Cycle
ID = 75A




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