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IRFBA1404P
1000
Duty Cycle = Single Pulse
100
10
1
0.01
0.05
0.10
Allowed avalanche Current vs
avalanche pulsewidth, tav
assuming ? Tj = 25°C due to
avalanche losses
1.0E-08
1.0E-07
1.0E-06
1.0E-05
1.0E-04
1.0E-03
1.0E-02
1.0E-01
tav (sec)
Fig 15. Typical Avalanche Current Vs.Pulsewidth
Notes on Repetitive Avalanche Curves , Figures 15, 16:
500
TOP Single Pulse
BOTTOM 10% Duty Cycle
(For further info, see AN-1005 at www.irf.com)
1. Avalanche failures assumption:
Purely a thermal phenomenon and failure occurs at a
400
300
200
100
ID = 95A
temperature far in excess of T jmax . This is validated for
every part type.
2. Safe operation in Avalanche is allowed as long asT jmax is
not exceeded.
3. Equation below based on circuit and waveforms shown in
Figures 12a, 12b.
4. P D (ave) = Average power dissipation per single
avalanche pulse.
5. BV = Rated breakdown voltage (1.3 factor accounts for
voltage increase during avalanche).
6. I av = Allowable avalanche current.
7. ? T = Allowable rise in junction temperature, not to exceed
T jmax (assumed as 25°C in Figure 15, 16).
0
25
50
75
100
125
150
175
t av = Average time in avalanche.
D = Duty cycle in avalanche = t av ·f
Z thJC (D, t av ) = Transient thermal resistance, see figure 11)
Starting T J , Junction Temperature (°C)
Fig 16. Maximum Avalanche Energy
Vs. Temperature
www.irf.com
P D (ave) = 1/2 ( 1.3·BV·I av ) = ? T/ Z thJC
I av = 2 ? T/ [1.3·BV·Z th ]
E AS (AR) = P D (ave) ·t av
7
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