AUIRFN7110 Datasheet, PDF (5/11 Pages) International Rectifier – Advanced Process Technology

AUIRFN7110
10
1
D = 0.50
0.1
0.01
0.001
1E-006
0.20
0.10
0.05
0.02
0.01
SINGLE PULSE
( THERMAL RESPONSE )
Notes:
1. Duty Factor D = t1/t2
2. Peak Tj = P dm x Zthjc + Tc
1E-005
0.0001
0.001
0.01
0.1
t1 , Rectangular Pulse Duration (sec)
Fig 12. Maximum Effective Transient Thermal Impedance, Junction-to-Case
100
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming Tj = 150°C and
Tstart =25°C (Single Pulse)
10
1
Allowed avalanche Current vs avalanche
pulsewidth, tav, assuming  j = 25°C and
Tstart = 150°C.
0.1
1.0E-06
1.0E-05
1.0E-04
tav (sec)
1.0E-03
1.0E-02
1.0E-01
Fig 13. Typical Avalanche Current vs. Pulse Width
140
TOP
Single Pulse
120
BOTTOM 1.0% Duty Cycle
ID = 35A
100
80
60
40
20
0
25 50 75 100 125 150 175
Starting TJ , Junction Temperature (°C)
Fig 14. Maximum Avalanche Energy vs. Temperature
Notes on Repetitive Avalanche Curves , Figures 13, 14:
(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 as Tjmax is not exceed
ed.
3.Equation below based on circuit and waveforms shown in Figures
17a, 17b.
4. PD (ave) = Average power dissipation per single avalanche pulse.
5. BV = Rated breakdown voltage (1.3 factor accounts for voltage in
crease during avalanche).
6. Iav = Allowable avalanche current.
7T = Allowable rise in junction temperature, not to exceed Tjmax
(assumed as 25°C in Figure 13, 14).
tav = Average time in avalanche.
D = Duty cycle in avalanche = tav ·f
ZthJC(D, tav) = Transient thermal resistance, see Figures 12)
P_{D (ave)} = 1/2 ( 1.3·BV·I_av) = T/ Z_thJC
I_av = 2T/ [1.3·BV·Z_th]
E_{AS (AR)} = P_{D (ave)}·t_av
5 www.irf.com © 2015 International Rectifier
Submit Datasheet Feedback
July 23, 2015