SG6846 查看數據表（PDF） - Fairchild Semiconductor
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SG6846 Datasheet PDF : 16 Pages
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Electrical Characteristics (Continued)
VDD = 15V and TA = 25°C unless otherwise noted.
Symbol
Parameter
Conditions
Oscillator Section
fOSC
fOSC-G
VFB-N
VFB-G
SG
fDV
fDT
Normal PWM Frequency
RI = 26kΩ
Green-Mode Minimum Frequency
RI = 26kΩ
FB-Pin Threshold for the Beginning of Green
Mode
Green-OFF-Mode Voltage at FB Pin
Slope for Green-Mode Modulation
RI = 26kΩ
Frequency Variation vs. VDD Deviation
VDD = 11.5V to 20V
Frequency Variation vs. Temperature
Deviation
TA = -20 to 85°C
Min.
60
18.0
Typ.
65
22.5
2.1
1.6
85
1.5
Max. Unit
70 KHz
25.0 KHz
V
V
Hz/mV
5
%
5.0
%
Continued on following page…
Frequency
f OSC: 65 KHz
PW M
Frequency
fOSC -GREEN : 22 .5 KHz
fOSC -OFF : 0Hz
VFB -G
V FB -N
VFB
Figure 6. PWM Frequency
© 2008 Fairchild Semiconductor Corporation
SG6846 • Rev. 1.3.1
7
www.fairchildsemi.com
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