FA5604 Datasheet, PDF (10/31 Pages) Fuji Electric – FUJI Power Supply Control IC

FA5604/5605/5606
8. Characteristic curve
Ta=25°C, VCC=18V, Rt=12kΩ, unless otherwise specified
Parts tolerance and characteristics are not defined in all application described in this Data book.
Oscillation frequency vs.Timing resistance
VFB=3.25V,VVF=5V,CS=OPEN
350
300
250
200
150
100
50
0
5
10
15
20
25
Timing resistance Rt [kΩ]
200
175
150
125
100
75
50
25
0
0
Oscillation frequency vs. VF pin voltage
VFB=5V,CS=OPEN
FA5605/06
FA5604
These are the characteristics after changes of
the frequency at overload. Fosc ≈ 165 kHz or
180 kHz when VVF = 5 V.
1
2
3
4
5
VF pin voltage VVF[V]
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0
Fosc variation by supply voltage
VFB=3.25V,VVF=5V,CS=OPEN
FA5605/06
FA5604
5
10
15
20
25
30
35
40
Supply voltage VCC [V]
200
175
150
125
100
75
50
25
0
0
Oscillation freqency vs.FB pin voltage
FA5604
VVF=5V,CS=OPEN,VIS=0V
1
2
3
4
5
FB pin voltage VFB [V]
200
175
150
125
100
75
50
25
0
0
Oscillation frequency vs.FB pin voltage
FA5605
VVF=5V,CS=OPEN,VIS=0V
1
2
3
4
5
FB pin voltage VFB [V]
200
175
150
125
100
75
50
25
0
0
Oscillation frequency vs.FB pin voltage
FA5606
VVF=5V,CS=OPEN,VIS=0V
1
2
3
4
5
FB pin voltage VFB [V]
Fuji Electric Co., Ltd.
AN-033E Rev.1.2
April-2011
10
http://www.fujielectric.co.jp/products/semiconductor/