5

IRF840, SiHF840

Fig. 9 - Maximum Drain Current vs. Case Temperature

Fig. 10a - Switching Time Test Circuit

Fig. 10b - Switching Time Waveforms

Fig. 11 - Maximum Effective Transient Thermal Impedance, Junction-to-Case

Fig. 12a - Unclamped Inductive Test Circuit

Fig. 12b - Unclamped Inductive Waveforms

91070_09

0.0

2.0

4.0

6.0

8.0

25

150

125

100

75

50

Pulse width

≤ 1 µs

Duty factor

≤ 0.1 %

R

D

V

GS

R

G

D.U.T.

10 V

+

-

V

DS

V

DD

V

DS

90 %

10 %

V

GS

t

d(on)

t

r

t

d(off)

t

f

0

- 0.5

0.2

0.1

0.05

0.02

0.01

Single Pulse

(Thermal Response)

P

DM

t

1

t

2

Notes:

1. Duty Factor, D = t

2. Peak T

91070_11

0.1

1

10

10

1

0.1

R

G

0.01

Ω

D.U.T.

L

V

DS

+

-

V

DD

10 V

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