DC/DC Step-Down Converter IC

SI-8000TM Series

September 2005

Sanken Electric Co.,Ltd.

I02-001EA-050910

Reference data

・

Calculation of junction temperature

The junction temperature can be obtained from the following equation using the Tc that is measured by

thermocouple.

C

C

j

D

T

P

Tj

+

×

=

−

θ

(θj-ｃ＝6℃／W)

5. Block diagram (Connection diagram)

SI-3000KM/KMS　銅箔面積ー熱抵抗

40

50

60

70

80

90

100

10

100

1000

銅箔面積　（㎜

銅箔面積－許容損失Tjmax=100℃

0

0.5

1

1.5

10

100

1000

銅箔面積　（㎜2）

Ta=25℃

40℃

60℃

85℃

Copper area on PC board vs. Power dissipation

Tj=100℃ Area of PC board：30×30mm

SI-8000TM Copper area on PC board vs. thermal resistance.

Area of PC board：30×30mm

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