SG6859 데이터 시트보기 (PDF) - Fairchild Semiconductor
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SG6859 Datasheet PDF : 13 Pages
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Low Cost Green-Mode PWM Controller for Flyback Converters
Feedback Input Section
Symbol Parameter
ZFB
Input Impedance
VFB-OPEN
VFB-OL
tD-OLP
VFB-N
FB Output High Voltage
FB Open-loop Trigger Level
The delay time of FB pin Open Loop Protection
Green-Mode Entry FB Voltage
VFB-G
SG
Green-Mode Ending FB Voltage
Green-Mode Modulation Slope
Test Condition
RI=95KΩ
Current Sense Section
Symbol Parameter
ZSENSE
tPD
VSTHFL
VSTHVA
tLEB
DCYSAW
Input Impedance
Delay to Output
Flat Threshold Voltage for Current Limit
Valley Threshold Voltage for Current Limit
Leading-Edge Blanking Time
Duty Cycle of SAW Limit
Test Condition
Product Specification
SG6859
Min.
5
4.3
2.6
40
Typ.
5
4.6
56
2.85
2.20
75
Max.
4.9
3.1
100
Unit
KΩ
V
V
ms
V
V
Hz/mV
Min.
10
40
0.91
0.75
250
Typ.
55
0.96
0.80
300
40
Max.
100
1.01
0.85
350
Unit
KΩ
ns
V
V
ns
%
Oscillator Section
Symbol Parameter
FOSC
Center Frequency
Normal PWM Frequency
Hopping Range
THOP
Hopping Period
FOSC-G
Green-Mode Frequency
FDV
Frequency Variation versus VDD Deviation
FDT
Frequency Variation versus Temp. Deviation
Test Condition
RI=95KΩ
RI=95KΩ
RI=95KΩ
VDD=13.5 to 22V
TA=-20 to 85°C
Min.
65
0
Typ.
70
±4.9
3.7
22
0.02
Max.
75
2
2
Unit
KHz
ms
KHz
%
%
Output Section
Symbol Parameter
DCYMAX
Maximum Duty Cycle
VGATE-L
Output Voltage Low
VGATE-H
Output Voltage High
tr
Rising Time
tf
Falling Time
VGATE-CLAMP
Output Clamp Voltage
Test Condition
VDD=15V, Io=20mA
VDD=13.5V, Io=20mA
VDD=15V, CL=1nF
VDD=15V, CL=1nF
VDD=22V
Min.
70
8
16
Typ.
75
150
55
17
Max.
80
1.5
18
Unit
%
V
V
ns
ns
V
© System General Corp.
Version 1.2.1(IAO33.0067.B2)
-5-
www.sg.com.tw • www.fairchildsemi.com
September 28, 2007
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