IRF135S203 datasheet(6/12 Pages) IRF

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IRF135B203/IRF135S203

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June 17, 2015

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

Notes on Repetitive Avalanche Curves , Figures 15, 16:

(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 14)

PD (ave) = 1/2 ( 1.3·BV·Iav) = T/ ZthJC

Iav = 2T/ [1.3·BV·Zth]

EAS (AR) = PD (ave)·tav

Fig 16. Maximum Avalanche Energy vs. Temperature

Fig 15. Avalanche Current vs. Pulse Width

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)

100

200

300

400

500

600

TOP

Single Pulse

BOTTOM 1.0% Duty Cycle

ID = 77A

1.0E-06

1.0E-05

1.0E-04

1.0E-03

1.0E-02

1.0E-01

tav (sec)

0.1

100

1000

Duty Cycle = Single Pulse

Allowed avalanche Current vs avalanche

pulsewidth, tav, assuming j = 25°C and

Tstart = 150°C.

Allowed avalanche Current vs avalanche

pulsewidth, tav, assuming Tj = 150°C and

Tstart =25°C (Single Pulse)

0.01

0.05

0.10

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