AUIRLR3110Z Datasheet, PDF (8/13 Pages) International Rectifier – AUTOMOTIVE GRADE

100
Duty Cycle = Single Pulse
0.01
10
0.05
0.10
Allowed avalanche Current vs avalanche
1 _{pulsewidth, tav, assuming ΔΤ j = 25°C and}
Tstart = 150°C.
AUIRLR/U3110Z
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming Δ Tj = 150°C and
Tstart =25°C (Single Pulse)
0.1
1.0E-06
1.0E-05
1.0E-04
1.0E-03
tav (sec)
1.0E-02
Fig 15. Typical Avalanche Current vs.Pulsewidth
1.0E-01
150
TOP
Single Pulse
BOTTOM 1% Duty Cycle
125
ID = 38A
100
75
50
25
0
25 50 75 100 125 150 175
Starting TJ , Junction Temperature (°C)
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 T_jmax. This is validated for
every part type.
2. Safe operation in Avalanche is allowed as long as
neither Tjmax nor Iav (max) is 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. ΔT = 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
Z_thJC(D, t_av) = Transient thermal resistance, see figure 11)
P_{D (ave)} = 1/2 ( 1.3·BV·I_av) = DT/ Z_thJC
I_av = 2DT/ [1.3·BV·Z_th]
E_{AS (AR)} = P_{D (ave)}·t_av
2014-8-24
8
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