IRF1324LPBF datasheet(6/10 Pages) IRF

6 / 10 page

IRF1324S/LPbF

www.irf.com

Fig 16. Threshold Voltage vs. Temperature

-75 -50 -25 0 25 50 75 100 125 150 175 200

TJ , Temperature ( °C )

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

ID = 250µA

ID = 1.0mA

ID = 1.0A

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 asTjmax is not exceeded.

3. Equation below based on circuit and waveforms shown in Figures 16a, 16b.

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) = DT/ ZthJC

Iav = 2DT/ [1.3·BV·Zth]

EAS (AR) = PD (ave)·tav

100

125

150

175

Starting TJ , Junction Temperature (°C)

100

150

200

250

300

TOP

Single Pulse

BOTTOM 1.0% Duty Cycle

ID = 195A

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