IRFS5620PBF datasheet(5/9 Pages) IRF

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IRFS/SL5620PbF

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Fig 13. Maximum Avalanche Energy Vs. Drain Current

Fig 12. On-Resistance Vs. Gate Voltage

Fig 14. Typical Avalanche Current Vs.Pulsewidth

Fig 15. 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 as neither

Tjmax nor Iav (max) is exceeded

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 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 figure 11)

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

Iav = 2

DT/ [1.3·BV·Zth]

EAS (AR) = PD (ave)·tav

VGS, Gate -to -Source Voltage (V)

0.1

0.2

0.3

0.4

0.5

ID = 15A

TJ = 25°C

TJ = 125°C

100

125

150

175

Starting TJ , Junction Temperature (°C)

100

150

200

250

300

350

400

450

500

TOP

2.05A

2.94A

BOTTOM 15A

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

∆Τj = 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)

100

120

TOP

Single Pulse

BOTTOM 1.0% Duty Cycle

ID = 15A

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