IRF2804S-7PPBF View Datasheet(PDF) - International Rectifier
Part Name
Description
Manufacturer
IRF2804S-7PPBF Datasheet PDF : 10 Pages
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IRF2804S-7PPbF
10000
Duty Cycle = Single Pulse
1000
0.01
100
0.05
0.10
10
1
0.1
1.0E-06
1.0E-05
Allowed avalanche Current vs
avalanche pulsewidth, tav
assuming ∆Tj = 25°C due to
avalanche losses. Note: In no
case should Tj be allowed to
exceed Tjmax
1.0E-04
tav (sec)
1.0E-03
1.0E-02
1.0E-01
Fig 15. Typical Avalanche Current vs.Pulsewidth
Notes on Repetitive Avalanche Curves , Figures 15, 16:
800
(For further info, see AN-1005 at www.irf.com)
TOP
Single Pulse
1. Avalanche failures assumption:
BOTTOM 1% Duty Cycle
Purely a thermal phenomenon and failure occurs at a
ID = 160A
temperature far in excess of Tjmax. This is validated for
600
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
400
Figures 12a, 12b.
4. PD (ave) = Average power dissipation per single
avalanche pulse.
5. BV = Rated breakdown voltage (1.3 factor accounts for
200
voltage increase during avalanche).
6. Iav = Allowable avalanche current.
7. ∆T = Allowable rise in junction temperature, not to exceed
0
25
50
75
100 125 150 175
Starting TJ , Junction Temperature (°C)
Fig 16. Maximum Avalanche Energy
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
vs. Temperature
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