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PDF SG5841 Data sheet ( Hoja de datos )
| Número de pieza | SG5841 | |
| Descripción | Highly Integrated Green-Mode PWM Controller | |
| Fabricantes | Fairchild Semiconductor | |
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Highly Integrated Green-Mode PWM Controller
Product Specification
SG5841/J
FEATURES
Green-Mode PWM Controller
Low Start-Up Current (14µA)
Low Operating Current (4mA)
Programmable PWM Frequency with Hopping
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Synchronized Slope Compensation
Leading-Edge Blanking
Constant Output Power Limit
Totem Pole Output with Soft Driving
VDD Over-Voltage Clamping
Programmable Over-Temperature Protection (OTP)
Internal Open-Loop Protection
www.DataSheet4U.cVoDmD Under-Voltage Lockout (UVLO)
GATE Output Maximum Voltage Clamp (18V)
APPLICATIONS
General-purpose switch-mode power supplies and
flyback power converters, including:
Power Adapters
Open-Frame SMPS
DESCRIPTION
The highly integrated SG5841/J series of PWM
controllers provides several features to enhance the
performance of flyback converters.
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
continuously decrease the switching frequency at
light-load conditions. This green-mode function enables
the power supply to meet international power
conservation requirements. To further reduce power
consumption, SG5841/J is manufactured using the
BiCMOS process. This allows a low start-up current,
around 14µA, and an operating current of only 4mA. As a
result, a large start-up resistance can be used.
The SG5841/J built-in synchronized slope compensation
achieves stable peak-current-mode control. The
proprietary internal sawtooth power-limiter ensures
constant output power limit over a wide range of AC input
voltages, from 90VAC to 264VAC.
SG5841/J provides many protection functions. In addition
to cycle-by-cycle current limiting, the internal open-loop
protection circuit ensures safety should an open-loop or
output-short-circuit failure occur. PWM output is disabled
until VDD drops below the UVLO lower limit, then the
controller starts again. An external NTC thermistor can be
applied for over-temperature protection.
SG5841/J is available in an 8-pin DIP or SOP package.
TYPICAL APPLICATION
SG5841/J
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 1 - www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
1 page  
Highly Integrated Green-Mode PWM Controller
Oscillator Section
Symbol Parameter
Test Condition
FOSC
tHOP
Normal PWM Frequency
Hopping Period
Center Frequency
Hopping Range
RI=26KΩ
RI=26KΩ (5841J only)
RI=26KΩ (5841J only)
FOSC-G
FDV
FDT
Green-Mode Frequency
RI=26KΩ
Frequency Variation vs. VDD Deviation
VDD=11.5V to 24.7V
Frequency Variation vs. Temperature Deviation TA=-20 to +85°C
Min.
62
±3.7
3.9
18
Product Specification
SG5841/J
Typ.
65
±4.2
4.4
22
Max.
68
±4.7
4.9
25
5
5
Unit
KHz
ms
KHz
%
%
Feedback Input Section
Symbol Parameter
AV
ZFB
VFB-OPEN
www.DataSheetV4FUB-O.LcP om
tD-OLP
VFB-N
VFB-G
FB Input to Current Comparator Attenuation
Input Impedance
FB Output High Voltage
FB Open-Loop Trigger Level
Delay Time of FB pin Open-Loop Protection
Green-Mode Entry FB Voltage
Green-Mode Ending FB Voltage
Test Condition
FB pin open
RI=26KΩ
RI=26KΩ
RI=26KΩ
Min.
1/3.75
4
5
4.2
26
1.9
Typ.
1/3.20
6
4.5
29
2.1
VFB-N-0.5
Max.
1/2.75
7
4.8
32
2.3
Unit
V/V
KΩ
V
V
ms
V
V
Current-Sense Section
Symbol Parameter
ZSENSE
VSTHFL
VSTHVA
Input Impedance
Current Limit Flatten Threshold Voltage
Current Limit Valley Threshold Voltage
tPD Propagation Delay to GATE Output
tLEB Leading-Edge Blanking Time
Test Condition
VSTHFL–VSTHVA
RI=26KΩ
RI=26KΩ
Min.
0.85
200
Typ.
12
0.90
0.22
150
270
Max.
0.95
200
350
Unit
KΩ
V
V
ns
ns
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
- 5 - www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
5 Page 
Highly Integrated Green-Mode PWM Controller
REFERENCE CIRCUIT
Product Specification
SG5841/J
F1
CN1
1
2
3
R1 BD1
VZ1 L1 C1
L2 C2 4
R2
TR1
C5
1
C4 +
R5 C3
R7
D2
R3
www.DataSheet4U.com
U1
1 GND GATE
2 FB VDD
3 VIN SENSE
4 RI
RT
R9 SG5841/J
8
7
6
5
R10
THER2
1
R16
Q2
C11 C9 +
R8
Q1
1
T1
3
2
1 L3
2
C6 R4 C7 +
D3
+ C8
Vo+
D1
R6
D4
R12
R11
U2
C12
R13
C10
U3 R
R14
R15
VO+
BOM
Reference
BD1
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
D1
D2
D3
D4
F1
L1
L2
L3
Q1
Component
BD 4A/600V
XC 0.68µF/300V
XC 0.1µF/300V
CC 0.01µF/500V
EC 120µ/400V
YC 222p/250V
CC 1000pF/100V
EC 1000µF/25V
EC 470µF/25V
EC 10µF/50V
CC 222pF/50V
CC 470pF/50V
CC 102pF/50V(Option)
LED
Diode BYV95C
TVS P6KE16A
Diode FR103
FUSE 4A/250V
Choke (900µH)
Choke (10mH)
Inductor (2µH)
Diode 20A/100V
© System General Corp.
Version 1.3.1 (IAO33.0017.B6)
Reference
Q2
R1,R2
R3
R4
R5,R7
R6
R8
R9
R10
R11
R12
R13
R14
R15
R16
THER2
T1
U1
U2
U3
VZ1
- 11 -
Component
MOS 7A/600V
R 1Mohm 1/4W
R 100Kohm 1/2W
R 47ohm 1/4W
R 750Kohm 1/4W
R 2Kohm 1/8W
R 0.3ohm 2W
R 33Kohm 1/8W
R 4.7Kohm 1/8W 1%
R 470ohm 1/8W
R 0 ohm 1/8W
R 4.7Kohm 1/8W
R 154Kohm 1/8W
R 39Kohm 1/8W
R 100ohm 1/8W
Thermistor TTC104
Transformer (600µH-PQ2620)
IC SG5841/J
IC PC817
IC TL431
VZ 9G
www.sg.com.tw • www.fairchildsemi.com
September 20, 2007
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SG5841.PDF ] | |
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