auirfu120z International Rectifier Corp., auirfu120z Datasheet - Page 8

• Manufacturer Part Number: auirfu120z
• Description: Hexfet? Power Mosfet V Br Dss 100v
• Manufacturer: International Rectifier Corp.

8
0.01
0.1
10
1.0E-06
1
20
16
12
8
4
0
Fig 16. Maximum Avalanche Energy
25
Duty Cycle = Single Pulse
Starting T J , Junction Temperature (°C)
50
Vs. Temperature
0.01
0.05
0.10
75
TOP
BOTTOM 1% Duty Cycle
I D = 5.2A
Fig 15. Typical Avalanche Current Vs.Pulsewidth
100
1.0E-05
Single Pulse
125
150
175
tav (sec)
1.0E-04
Notes on Repetitive Avalanche Curves , Figures 15, 16:
(For further info, see AN-1005 at www.irf.com)
1. Avalanche failures assumption:
2. Safe operation in Avalanche is allowed as long asT
3. Equation below based on circuit and waveforms shown in
4. P
5. BV = Rated breakdown voltage (1.3 factor accounts for
6. I
7. T
t
Purely a thermal phenomenon and failure occurs at a
temperature far in excess of T
every part type.
not exceeded.
Figures 12a, 12b.
avalanche pulse.
voltage increase during avalanche).
T
D = Duty cycle in avalanche = t
Z
av =
av
thJC
jmax
D (ave)
= Allowable avalanche current.
=
Average time in avalanche.
(D, t
Allowable rise in junction temperature, not to exceed
(assumed as 25°C in Figure 15, 16).
= Average power dissipation per single
av
P
) = Transient thermal resistance, see figure 11)
D (ave)
Allowed avalanche Current vs
avalanche
assuming
avalanche losses. Note: In no
case should Tj be allowed to
exceed Tjmax
= 1/2 ( 1.3·BV·I
I
E
av
AS (AR)
= 2DT/ [1.3·BV·Z
1.0E-03
= P
pulsewidth,
Tj = 25°C due to
D (ave)
jmax
av
av
. This is validated for
·f
) = DT/ Z
·t
th
av
]
www.irf.com
tav
thJC
jmax
1.0E-02
is