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IRF1302L View Datasheet(PDF) - International Rectifier

Part NameIRF1302L IR
International Rectifier IR
DescriptionAUTOMOTIVE MOSFET
IRF1302L Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
1000
Duty Cycle = Single Pulse
0.01
100
0.05
0.10
10
IRF1302S/IRF1302L
Allowed avalanche Current vs
avalanche pulsewidth, tav
assuming Tj = 25°C due to
avalanche losses
1
1.0E-07
1.0E-06
1.0E-05
1.0E-04
tav (sec)
1.0E-03
1.0E-02
Fig 15. Typical Avalanche Current Vs.Pulsewidth
1.0E-01
410
360
310
260
210
160
110
60
10
25
TOP
Single Pulse
BOTTOM 10% Duty Cycle
ID = 104A
50
75
100
125
Starting TJ , Junction Temperature (°C)
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.
150 D = Duty cycle in avalanche = tav ·f
ZthJC(D, tav) = Transient thermal resistance, see figure 11)
Fig 16. Maximum Avalanche Energy
Vs. Temperature
www.irf.com
PD (ave) = 1/2 ( 1.3·BV·Iav) = DT/ ZthJC
Iav = 2DT/ [1.3·BV·Zth]
EAS (AR) = PD (ave)·tav
7
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