www.vishay.com

Document Number: 91055

6

S11-1049-Rev. C, 30-May-11

This document is subject to change without notice.

IRF740S, SiHF740S

Vishay Siliconix

Fig. 12a - Unclamped Inductive Test Circuit

Fig. 12b - Unclamped Inductive Waveforms

Fig. 12c - Maximum Avalanche Energy vs. Drain Current

Fig. 13a - Basic Gate Charge Waveform

Fig. 13b - Gate Charge Test Circuit

R

g

0.01

W

D.U.T

L

V

DS

+

-

V

DD

10 V

91055_12c

Bottom

Top

I

D

4.5 A

5.3 A

10 A

V

1200

0

200

400

600

800

1000

25

150

125

100

75

50

Q

GS

Q

GD

Q

G

Charge

V

GS

D.U.T.

3 mA

V

GS

V

DS

I

G

I

D

0.3 µF

0.2 µF

50 k

Ω

12 V

Current regulator

Current sampling resistors

Same type as D.U.T.

+

-