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AUIRFR/U4105Z
100
Duty Cycle = Single Pulse
Allowed avalanche Current vs
10
1
0.1
0.01
0.05
0.10
avalanche pulsewidth, tav
assuming ? Tj = 25°C due to
avalanche losses. Note: In no
case should Tj be allowed to
exceed Tjmax
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
30
25
20
15
10
5
TOP Single Pulse
BOTTOM 1% Duty Cycle
ID = 18A
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 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.
0
25
50
75
100
125
150
175
7. ? T = Allowable rise in junction temperature, not to exceed
T jmax (assumed as 25°C in Figure 15, 16).
t av = Average time in avalanche.
D = Duty cycle in avalanche = t av ·f
Starting T J , Junction Temperature (°C)
Fig 16. Maximum Avalanche Energy
Z thJC (D, t av ) = Transient thermal resistance, see figure 11)
P D (ave) = 1/2 ( 1.3·BV·I av ) = D T/ Z thJC
I av = 2 D T/ [1.3·BV·Z th ]
E AS (AR) = P D (ave) ·t av
8
Vs. Temperature
www.irf.com
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