SG6846G Просмотр технического описания (PDF) - Fairchild Semiconductor
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SG6846G Datasheet PDF : 14 Pages
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Electrical Characteristics (Continued)
VDD = 15V and TA = 25°C unless otherwise noted.
Symbol
Parameter
Test Condition
Oscillator Section
Center
fOSC
Normal PWM Frequency Frequency
RI = 26kΩ, VFB>VN
Jitter Range
fOSC,MAX
Maximum PWM
Frequency
Center
Frequency
Jitter Range
RI = 13kΩ, VFB>VN
fOSC,MIN
Center
Minimum PWM Frequency Frequency
Jitter Range
RI = 36kΩ, VFB>VN
thop-1
thop-3
fOSC-G
VFB-N
Jitter Period
Jitter period
Green Mode Minimum Frequency
FB Threshold Voltage for Pin, FB Voltage
Frequency Reduction
Jitter Range
RI = 26kΩ, VFB ≥ VN
RI = 26kΩ, VFB = VG
RI = 26kΩ
RI = 26kΩ, VFB = VN
VFB-G
FB Voltage at fOSC-G
Pin, FB Voltage
RI = 26kΩ, VFB = VG
Jitter Range
SG
VFB-ZDC
fDV
fDT
Slope for Green-Mode Modulation
FB Threshold Voltage for Zero Duty Cycle
Frequency Variation vs. VDD Deviation
Frequency Variation vs. Temperature
Deviation
RI = 26kΩ
VDD = 11.5V to 20V
TA = -30 to 85°C
Min.
62
±3.7
124
±7.4
44.8
±2.54
3.9
10.2
18.0
2.6
3.7
2.1
1.27
1.8
Typ.
65
±4.2
130
±8.4
47.0
±2.90
4.4
11.5
22.5
2.8
4.2
2.3
1.45
85
2.0
1.5
Max. Unit
68
kHz
±4.7
136
kHz
±9.4
49.2
±3.26
4.9
12.8
25.0
3
4.7
2.5
1.62
2.2
5
kHz
ms
ms
kHz
V
KHz
V
KHz
Hz/mV
V
%
5.0
%
Continued on following page…
© 2008 Fairchild Semiconductor Corporation
SG6846G • Rev. 1.0.2
Figure 5. PWM Frequency
6
www.fairchildsemi.com
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