FA5640 Datasheet, PDF (20/35 Pages) Fuji Electric – Fuji Switching Power Supply Control IC

FA5640/41/42
5
Load increase
4
3
2
Load decrease
1
6 7 8 9 10 11 12 13 14 15
ON-OFF width [us] _11.67us
Fig.4 ON/OFF width at transfer to bottom-skip operation
150
Load decrease
Load increase
100
1st
2nd
4th ^3rd
1st
50
2nd
4th ^3rd
Bottom skip
0
0
20
40
60
80
100
Output power [W]
Fig.5 Change image of switching frequency
20
Load decrease
Load increase
15
1st
2nd
3rd
10
4th
2nd
1st
3rd
5 _4th
Bottom skip
0
0
20
40
60
80
100
Output power [W]
Fig.6 Change image of ON/OFF width
Fuji Electric Co., Ltd.
AN-064E Rev.1.1
April 2011
20
http://www.fujielectric.co.jp/products/semiconductor/