ncp1234ad100r2g ON Semiconductor, ncp1234ad100r2g Datasheet - Page 9

• Manufacturer Part Number: ncp1234ad100r2g
• Description: Ncp1234 Fixed Frequency Current Mode Controller For Flyback Converters
• Manufacturer: ON Semiconductor

24
23
22
21
20
19
18
17
16
15
2.20
2.15
2.10
2.05
2.00
1.95
1.90
1.85
1.80
70
69
68
67
66
65
64
63
62
61
60
−50
−50
−50
Figure 9. FB Pin Internal Pull−up Resistor
Figure 11. Oscillator Frequency f
Figure 13. FB Pin Voltage Below Which
−25
−25
−25
Frequency Foldback Starts V
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
R
25
FB(up)
TYPICAL PERFORMANCE CHARACTERISTICS
50
50
50
75
75
75
FB(foldS)
OSC
100
100
100
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125
125
125
9
5.30
5.20
5.10
5.00
4.90
4.80
4.70
4.60
1.50
1.45
1.40
1.35
1.30
1.25
1.20
85
84
83
82
81
80
79
78
77
76
75
−50
−50
−50
Frequency Foldback is Complete V
Figure 14. FB Pin Voltage Below Which
Figure 10. FB Pin Open Voltage V
Figure 12. Maximum Duty Cycle D
−25
−25
−25
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
25
50
50
50
75
75
75
FB(foldE)
FB(ref)
MAX
100
100
100
125
125
125