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IRF6609TR1 Fiches technique(PDF) 6 Page - International Rectifier

No de pièce IRF6609TR1
Description  Low Conduction Losses
Download  11 Pages
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Fabricant  IRF [International Rectifier]
Site Internet  http://www.irf.com
Logo IRF - International Rectifier

IRF6609TR1 Fiches technique(HTML) 6 Page - International Rectifier

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IRF6609
6
www.irf.com
Fig 12. Typical Avalanche Current vs.Pulsewidth
Fig 13. Maximum Avalanche Energy
vs. Temperature
Notes on Repetitive Avalanche Curves , Figures 12, 13:
(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 16a, 16b.
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 12, 13).
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
1.0E-06
1.0E-05
1.0E-04
1.0E-03
1.0E-02
1.0E-01
1.0E+00
1.0E+01
tav (sec)
0.01
0.1
1
10
100
1000
10000
0.05
Duty Cycle = Single Pulse
0.10
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
0.01
25
50
75
100
125
150
Starting TJ , Junction Temperature (°C)
0
50
100
150
200
250
Single Pulse
ID = 25A


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