AUIRF7749L2TR

7

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August 10, 2015

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

3. Equation below based on circuit and waveforms shown in Figures 18a, 18b.

5. BV = Rated breakdown voltage (1.3 factor accounts for voltage increase

during avalanche).

7.

25°C in Figure 16, 17).

Fig 17. Maximum Avalanche Energy vs. Temperature

Fig 18a. Unclamped Inductive Test Circuit

Fig 18b. Unclamped Inductive Waveforms

Fig 19a. Gate Charge Test Circuit

Fig 19b. Gate Charge Waveform

VDD 

Fig 20a. Switching Time Test Circuit

Fig 20b. Switching Time Waveforms

25

50

75

100

125

150

175

Starting TJ , Junction Temperature (°C)

0

50

100

150

200

250

300

350

TOP

Single Pulse

BOTTOM 1.0% Duty Cycle

ID = 120A