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IRF1018ESLPBF Folha de dados(PDF) 5 Page - International Rectifier

Nome de Peças IRF1018ESLPBF
Descrição Electrónicos  High Efficiency Synchronous Rectification in SMPS
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Fabricante Electrônico  IRF [International Rectifier]
Página de início  http://www.irf.com
Logo IRF - International Rectifier

IRF1018ESLPBF Folha de dados(HTML) 5 Page - International Rectifier

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IRF1018E/S/SLPbF
www.irf.com
5
Fig 13. Maximum Effective Transient Thermal Impedance, Junction-to-Case
Fig 14. Typical Avalanche Current vs.Pulsewidth
Fig 15. Maximum Avalanche Energy vs. Temperature
Notes on Repetitive Avalanche Curves , Figures 14, 15:
(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.
ΔT = Allowable rise in junction temperature, not to exceed Tjmax (assumed as
25°C in Figure 14, 15).
tav = Average time in avalanche.
D = Duty cycle in avalanche = tav ·f
ZthJC(D, tav) = Transient thermal resistance, see Figures 13)
PD (ave) = 1/2 ( 1.3·BV·Iav) = DT/ ZthJC
Iav = 2DT/ [1.3·BV·Zth]
EAS (AR) = PD (ave)·tav
1E-006
1E-005
0.0001
0.001
0.01
0.1
t1 , Rectangular Pulse Duration (sec)
0.001
0.01
0.1
1
10
0.20
0.10
D = 0.50
0.02
0.01
0.05
SINGLE PULSE
( THERMAL RESPONSE )
Notes:
1. Duty Factor D = t1/t2
2. Peak Tj = P dm x Zthjc + Tc
Ri (°C/W)
τι (sec)
0.026741 0.000007
0.28078 0.000091
0.606685 0.000843
0.406128 0.005884
τJ
τJ
τ1
τ1
τ2
τ2
τ3
τ3
R1
R1
R2
R2
R3
R3
Ci
i
/Ri
Ci=
τi/Ri
τ
τC
τ4
τ4
R4
R4
1.0E-06
1.0E-05
1.0E-04
1.0E-03
1.0E-02
1.0E-01
tav (sec)
0.1
1
10
100
0.05
Duty Cycle = Single Pulse
0.10
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming
ΔΤ j = 25°C and
Tstart = 150°C.
0.01
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming
ΔTj = 150°C and
Tstart =25°C (Single Pulse)
25
50
75
100
125
150
175
Starting TJ , Junction Temperature (°C)
0
20
40
60
80
100
TOP
Single Pulse
BOTTOM 10% Duty Cycle
ID = 47A


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