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IRFP4768PBF View Datasheet(PDF) - International Rectifier

Part Name
Description
Manufacturer
IRFP4768PBF
IR
International Rectifier IR
IRFP4768PBF Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
IRFP4768PbF
1
D = 0.50
0.1
0.20
0.10
0.05
0.01
0.02
0.01
0.001
0.0001
1E-006
SINGLE PULSE
( THERMAL RESPONSE )
1E-005
0.0001
Ï„J Ï„J
Ï„1 Ï„1
R1R1
Ci= Ï„i/Ri
Ci Ï„i/Ri
R2R2
Ï„2 Ï„2
R3R3 Ri (°C/W) τi (sec)
Ï„CÏ„ 0.0634 0.000278
Ï„3 Ï„3
0.1109 0.005836
0.1148 0.053606
Notes:
1. Duty Factor D = t1/t2
2. Peak Tj = P dm x Zthjc + Tc
0.001
0.01
0.1
1
t1 , Rectangular Pulse Duration (sec)
Fig 13. Maximum Effective Transient Thermal Impedance, Junction-to-Case
1000
Duty Cycle = Single Pulse
100
0.01
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming ∆Tj = 150°C and
Tstart =25°C (Single Pulse)
10 0.05
0.10
1
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming ∆Τ j = 25°C and
Tstart = 150°C.
0.1
1.0E-06
1.0E-05
1.0E-04
1.0E-03
1.0E-02
tav (sec)
Fig 14. Typical Avalanche Current vs.Pulsewidth
1.0E-01
800
Notes on Repetitive Avalanche Curves , Figures 14, 15:
TOP
Single Pulse
(For further info, see AN-1005 at www.irf.com)
700
BOTTOM 1.0% Duty Cycle
1. Avalanche failures assumption:
ID = 56A
600
500
400
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).
300
6. Iav = Allowable avalanche current.
7. ∆T = Allowable rise in junction temperature, not to exceed Tjmax (assumed as
200
25°C in Figure 14, 15).
tav = Average time in avalanche.
100
D = Duty cycle in avalanche = tav ·f
ZthJC(D, tav) = Transient thermal resistance, see Figures 13)
0
25 50 75 100 125 150 175
Starting TJ , Junction Temperature (°C)
PD (ave) = 1/2 ( 1.3·BV·Iav) = DT/ ZthJC
Iav = 2DT/ [1.3·BV·Zth]
EAS (AR) = PD (ave)·tav
Fig 15. Maximum Avalanche Energy vs. Temperature
www.irf.com
5
 

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