FA551 Datasheet, PDF (5/22 Pages) List of Unclassifed Manufacturers – CMOS IC For Switching Power Supply Control

FA551X
■ Characteristic curves (VCC=18V, RT=47kΩ, Ta=25˚C)
Oscillation frequency (fOSC) vs.
timing resistor resistance (RT)
1000
100
10
1
1
10
100
1000
RT (kΩ)
Oscillation frequency (fOSC) vs. supply voltage (VCC)
100.1
100.08
100.06
100.04
100.02
100
99.98
99.96
99.94
99.92
99.9
10
15
20
25
30
Vcc (V)
Oscillation frequency (fOSC) vs.
junction temperature (Tj)
FB pin source current (IFB) vs. FB pin voltage (VFB)
102
0
101.5
101
100.5
100
-100
-200
-300
-400
-500
99.5
99
98.5
–50
0
50
100
150
Tj (˚C)
-600
-700
-800
0
1
2
3
4
5
VFB (V)
Maximum duty cycle (DMAX) vs. timing resitor resistance (RT)
FA5510/14
49
48
47
46
45
44
43
42
1
10
100
1000
RT (kΩ)
Maximum duty cycle (DMAX) vs. timing resitor resistance (RT)
FA5511/15
72
71
70
69
68
67
1
10
100
1000
RT (kΩ)
5