DC/DC Step-Down Converter IC
SI-8000TM Series
September 2005
Reference data
SI-8000TM Copper area on PC board vs. thermal resistance.
SI-3000KM/KMS 銅箔面積ー熱抵抗
Area of PC board:30×30mm
100
90
80
70
60
50
40
10
100
Copper are銅a o箔n P面C 積boa rd(㎜(2)mm2)
1000
1.5
1
0.5
0
10
Copper area on PC board vs. Power dissipation
銅箔面Tj積=10-0℃許A容rea損of 失PCTbojmarda:x=301×0300℃mm
100
Copper area銅on箔P面C積bo ar(d㎜2() mm2)
Ta=25℃
40℃
60℃
85℃
1000
・Calculation of junction temperature
The junction temperature can be obtained from the following equation using the Tc that is measured by
thermocouple.
Tj = PD ×θj − C + TC
(θj-c=6℃/W)
Tc measurement point
●
5. Block diagram (Connection diagram)
Sanken Electric Co.,Ltd.
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I02-001EA-050910