IRFS7530-7PPBF datasheet(6/11 Pages) IRF

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March 5, 2015

IRFS7530-7PPbF

Fig 14. Maximum Effective Transient Thermal Impedance, Junction-to-Case

Fig 15. Avalanche Current vs. Pulse Width

Fig 16. 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

23a, 23b.

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 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) = T/ ZthJC

Iav = 2T/ [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)

0.0001

0.001

0.01

0.1

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

100

125

150

175

Starting TJ, Junction Temperature (°C)

400

800

1200

1600

2000

2400

I D

TOP

21A

44A

BOTTOM

100A

1.0E-06

1.0E-05

1.0E-04

1.0E-03

1.0E-02

1.0E-01

tav (sec)

100

1000

Allowed avalanche Current vs avalanche

pulsewidth, tav, assuming

j = 25°C and

Tstart = 150°C. (Single Pulse)

Allowed avalanche Current vs avalanche

pulsewidth, tav, assuming

Tj = 150°C and

Tstart =25°C (Single Pulse)

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