SG6846B Fairchild Semiconductor, SG6846B Datasheet - Page 10

• Manufacturer Part Number: SG6846B
• Description: The highly integrated PWM controller, SG6846B, provides several features to enhance the performance of fly-back converters
• Manufacturer: Fairchild Semiconductor

© 2008 Fairchild Semiconductor Corporation
SG6846B • Rev. 1.3.4
Typical Performance Characteristics
Figure 17. PWM Turn-on Threshold Voltage (V
70. 8
70. 6
70. 4
70. 2
70. 0
69. 8
0.925
0.920
0.915
0.910
0.905
64. 0
63. 5
63. 0
62. 5
62. 0
-40
-40
Figure 13. Normal PWM Frequency (f
-40
Figure 15. Output Current of RT pin (I
PW M Turn-on Threshold Voltage (V
-25
-25
-25
Output Current of RT Pin (I
Normal PWM Frequency (f
-10
-10
-10
5
5
5
vs. Temperature
vs. Temperature
vs. Temperature
20
20
Temperature ( ℃ )
Temperature ( ℃ )
2 0
Temperature ( ℃ )
35
35
3 5
50
50
R T
OSC
5 0
) vs Temperature
) vs Temperature
65
65
IN-ON
6 5
) vs Temperature
80
80
80
95
95
95
OSC
RT
110
110
)
1 10
)
IN-ON
(Continued)
125
125
125
)
10
Figure 18. PWM Turn-off Threshold Voltage (V
8 7.2
8 7.0
8 6.8
8 6.6
8 6.4
8 6.2
0 .7 1 5
0 .7 1 0
0 .7 0 5
0 .7 0 0
0 .6 9 5
0 .6 9 0
1. 10
1. 08
1. 06
1. 04
1. 02
1. 00
-4 0
-40
Figure 16. Trigger Voltage of OTP(V
Figure 14. Maximum Duty Cycle (D
-4 0
PW M Turn-off Threshold Voltage (V
-2 5
-25
Maximum Duty Cycle (DCYmax) vs Temperature
-2 5
Trigger Voltage of OTP (V
-10
-10
-1 0
5
5
5
vs. Temperature
vs. Temperature
vs. Temperature
20
20
Temperature (℃ )
Temperature ( ℃ )
2 0
Temperature ( ℃ )
35
35
3 5
R TT H
50
5 0
5 0
) vs Temperature
65
IN-OFF
6 5
6 5
) vs Temperature
80
80
8 0
CYmax
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95
RTTH
9 5
95
110
)
)
1 1 0
1 1 0
IN-OFF
125
1 2 5
12 5
)