SG6841SZ Fairchild Semiconductor, SG6841SZ Datasheet - Page 11

• Manufacturer Part Number: SG6841SZ
• Description: IC CTLR PWM HI INTEGRATED 8-SOIC
• Manufacturer: Fairchild Semiconductor

Specifications of SG6841SZ

• Frequency - Max: 70kHz
• Pwm Type: Controller
• Number Of Outputs: 1
• Duty Cycle: 90%
• Voltage - Supply: 10 V ~ 20 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-integrated Green-mode PWM Controller
REFERENCE CIRCUIT
Circuit
BOM
Reference
BD1
C1
C2
C3
C4
C5
C6
C7
C8
C9
D1
D2
D3
D4
F1
L1
L2
Q1
Q2
©System General Corp.
Version 2.1 (IRO33.0001.B5)
CN1
1
2
3
F1
Component
BD 4A/600V
XC 0.1uF/275V
XC 0.22uF/275V
CC 0.01uF/500V
EC 120u/400V
YC 222p/Y1
CC 1000pF/100V
CC 1000pF/50V
EC 1000uF/35V
EC 220uF/35V
LED
Diode FR157
ZD 18V
Diode FR102
FUSE 4A/250V
900uH
15mH
Diode 20A100V
MOS 7A/600V
1
VZ1
THER1
2
3
1
L1
4
2
C1
R1
R2
3
1
L2
4
2
1
2
3
4
R9
C5
GND
FB
VIN
RI
U1
C2
SG6841
R7
THER2
SENSE
4
GATE
VDD
RT
8
7
6
5
BD1
C4
R10
Reference
R1,R2
R3
R4
R5,R7
R6
R8
R9
R9
R11
R12
R13
R14
R15
THER1
T1
U1
U2
U3
VZ1
1
R5
+
- 11 -
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R12
C9
1
R8
Q2
C3
D2
1
D4
R3
2
1,2
3
4
5
1,2
3
4
5
4
3
U2
Component
R 1Mohm 1/4W
R 100Kohm 1/2W
R 47ohm 1/4W
R 750Kohm 1/4W
R 20Kohm 1/8W
R 0.3ohm 2W
R 33Kohm 1/8W
R 20Kohm 1/8W 1%
R 220ohm 1/8W
R 4.7ohm 1/8W
R 6.8Kohm 1/8W
R 154Kohm 1/8W
R 390Kohm 1/8W
Thermistor SCK054
Transformer
IC SG6841
IC PC817
IC TL431
VZ 9G
1
2
8,9
6,7
U3
8,9
6,7
R4
1
3
R13
Q1
1
C6
2
R15
C10
C7
R14
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Product Specification
Vo+
1
R11
L3
C8
2
www.sg.com.tw
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Jun.15,2006
SG6841
D3
R6
D1
Vo+