SG6858 Fairchild Semiconductor, SG6858 Datasheet - Page 6

• Manufacturer Part Number: SG6858
• Description: This highly integrated PWM controller provides several special enhancements designed to meet the low standby power needs of low-power SMPS
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
SG6858 • Rev. 1.2.4
Typical Performance Characteristics
Figure 8. Startup Current (I
Figure 6. Turn-On Threshold Voltage (V
75
73
71
69
67
65
Figure 10. Frequency (f
20
15
10
17.5
17.0
16.5
16.0
15.5
5
0
-40
-40
-40
-25
-25
Turn-On Threas hold Voltage (V
-25
Startup Current(I
-10
-10
Frequenc y (F
-10
5
5
5
vs. Temperature
Temperature (℃)
20
Tem perature
20
Tem perature (℃)
Temperature (℃)
20
O S C
35
35
DD-S T
35
OSC
) v s Tem perature
DD-ST
50
) v s Temperature
50
50
) vs. Temperature
) vs. Temperature
65
65
65
DD-O N
80
80
80
) v s
95
95
95
DD-ON
110
110
110
)
125
125
125
6
Figure 7. Turn-Off Threshold Voltage (V
80
78
76
74
72
70
12.5
12.1
11.7
11.3
10.9
10.5
3.5
3.0
2.5
2.0
1.5
Figure 9. Operating Supply Current (I
Figure 11. Maximum Duty Cycle (DCY
-40
-40
-40
Operating Supply Current (I
M ax im um Duty Cy c le (DCY
-25
-25
-25
Turn-off Thres hold Voltage (V
-10
-10
-10
5
5
5
vs. Temperature
vs. Temperature
vs. Temperature
Temperature (℃)
Temperature (℃)
20
20
Tem perature (℃)
20
Tem perature
35
35
35
50
50
50
DD-O P
MA X
65
65
) v s Tem perature
65
) v s Tem perature
DD-OF F
80
80
80
) v s
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95
95
95
DD-OP
DD-OFF
MAX
110
110
110
)
)
125
)
125
125