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FA551X
5
■ Characteristic curves (VCC=18V, RT=47k
Ω, Ta=25˚C)
Oscillation frequency (fOSC) vs.
Oscillation frequency (fOSC) vs. supply voltage (VCC)
timing resistor resistance (RT)
Oscillation frequency (fOSC) vs.
FB pin source current (IFB) vs. FB pin voltage (VFB)
junction temperature (Tj)
Maximum duty cycle (DMAX) vs. timing resitor resistance (RT)
Maximum duty cycle (DMAX) vs. timing resitor resistance (RT)
FA5510/14
FA5511/15
1
10
100
1000
110
100
1000
RT (k
Ω)
99.9
99.92
99.94
99.96
99.98
100
100.02
100.04
100.06
100.08
100.1
10
15
20
25
30
Vcc (V)
98.5
99
99.5
100
100.5
101
101.5
102
–50
0
50
100
150
Tj (˚C)
-800
-700
-600
-500
-400
-300
-200
-100
0
012345
VFB (V)
42
43
44
45
46
47
48
49
110
100
1000
RT (k
Ω)
67
68
69
70
71
72
110
100
1000
RT (k
Ω)
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