IRF6723M2DPBF_15 datasheet(6/10 Pages) IRF

6 / 10 page

IRF6723M2DTR/TR1PbF

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Fig 16. Typical Avalanche Current vs.Pulsewidth

Fig 17. Maximum Avalanche Energy

vs. Temperature

Notes on Repetitive Avalanche Curves , Figures 16, 17:

(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 19a, 19b.

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.

∆T = Allowable rise in junction temperature, not to exceed

Tjmax (assumed as 25°C in Figure 16, 17).

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 = 2

DT/ [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

tav (sec)

0.1

100

0.05

Duty Cycle = Single Pulse

0.10

Allowed avalanche Current vs avalanche

pulsewidth, tav, assuming

∆Τ j = 25°C and

Tstart = 150°C.

0.01

Allowed avalanche Current vs avalanche

pulsewidth, tav, assuming

∆Tj = 150°C and

Tstart =25°C (Single Pulse)

100

125

150

175

Starting TJ , Junction Temperature (°C)

TOP

Single Pulse

BOTTOM 1.0% Duty Cycle

ID = 12A

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