2SH28

6

Pulse Width

PW (S)

Normalized Transient Thermal Impedance vs. Pulse Width

Switching Time Test Circuit

Waveform

Ic Monitor

Vin Monitor

D.U.T.

Rg

Vin ± 15 V

10%

tf

tr

td(off)

td(on)

Ic

Vin

0

90%

90%

90%

10%

10%

ton

toff

V

Monitor

CE

3

1

0.3

0.1

0.03

0.01

10 µ

100 µ

1 m

10 m

100 m

1

10

DM

P

PW

T

D =

PW

T

ch – c(t) = s (t) •

ch – c

ch – c = 2.08 °C/W, Tc = 25 °C

θ

γ

θ

θ

Tc = 25°C

D = 1

0.5

0.2

0.1

0.05

0.02

0.01

1shot

pulse