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PDF SG5842JA Data sheet ( Hoja de datos )
| Número de pieza | SG5842JA | |
| Descripción | Highly Integrated Green-Mode PWM Controller | |
| Fabricantes | System General | |
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Highly Integrated Green-Mode PWM Controller
FEATURES
Green-Mode PWM Controller
Low Start-up Current (14µA)
Low Operating Current (4mA)
Programmable PWM Frequency with Hopping
(5842JA)
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 Protection (OVP)
Programmable Over-Temperature Protection (OTP)
www.DataSheet4U.cInotemrnal Latch Circuit (OTP, OVP)
Internal Open-Loop Protection
VDD Under-Voltage Lockout (UVLO)
GATE Output Maximum Voltage Clamp (18V)
APPLICATIONS
General-purpose switch mode power supplies and flyback
power converters, including:
Notebook Power Adapters
Open-Frame SMPS
DESCRIPTION
The highly integrated SG5842A/JA series of PWM
controllers provides several features to enhance the
performance of flyback converters.
Product Specification
SG5842A/JA
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
continuously decrease the switching frequency at
light-load conditions. To avoid acoustic-noise problem,
the minimum PWM frequency set above 22KHz. This
green-mode function enables the power supply to meet
international power conservation requirements. To further
reduce power consumption, SG5842A/JA 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 SG5842A/JA built-in synchronized slope
compensation achieves stable peak-current-mode control.
SG5842JA integrates a frequency hopping function that
helps reduce EMI emission of a power supply with
minimum line filters.
SG5842A/JA 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. As long as VDD exceeds
about 24V, the internal OVP circuit is triggered. An
external NTC thermistor can be applied for
over-temperature protection.
SG5842A/JA is available in an 8-pin DIP or SOP package.
TYPICAL APPLICATION
SG5842A/JA
© System General Corp.
Version 1.4.2 (IAO33.0026.B6)
-1-
www.sg.com.tw • www.fairchildsemi.com
October 30, 2007
1 page  
Highly Integrated Green-Mode PWM Controller
Product Specification
SG5842A/JA
Oscillator Section
Symbol Parameter
FOSC
Normal PWM Frequency Center Frequency
Hopping Range
tHOP
FOSC-G
FDV
FDT
Hopping Period
Green-Mode Minimum Frequency
Frequency Variation vs. VDD Deviation
Frequency Variation vs. Temperature Deviation
Test Condition
RI=26KΩ
RI=26KΩ (5842JA only)
RI=26KΩ (5842JA only)
RI=26KΩ
VDD=11.5V to 20V
TA=-20 to 85°C
Min.
62
±3.7
3.9
18
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
www.DataSheetV4FUB-O.PcENom
VFB-OLP
tD-OLP
VFB-N
VFB-G
FB Input to Current Comparator Attenuation
Input Impedance
Output High Voltage
FB Open-Loop Trigger Level
FB Open-Loop Protection Delay
Green-Mode Entry FB Voltage
Green-Mode Ending FB Voltage
Test Condition
FB pin open
RI=26KΩ
RI=26KΩ
RI=26KΩ
Min.
1/4.5
4
5.5
5.0
50
1.9
Typ.
1/4.0
Max.
1/3.5
7
56
2.1
VFB-N-0.5
5.4
62
2.3
Unit
V/V
KΩ
V
V
ms
V
V
Current Sense Section
Symbol Parameter
ZSENSE
VSTHFL
VSTHVA
DCYSAW
tPD
tLEB
Input Impedance
Current Limit Flatten Threshold Voltage
Current Limit Valley Threshold Voltage
Duty Cycle of SAW Limit
Propagation Delay to GATE Output
Leading-Edge Blanking Time
Test Condition
Min.
VSTHFL–VSTHVA
Maximum Duty Cycle
RI=26KΩ
RI=26KΩ
0.85
200
Typ.
12
0.90
0.22
45
150
270
Max.
0.95
200
350
Unit
KΩ
V
V
%
ns
ns
© System General Corp.
Version 1.4.2 (IAO33.0026.B6)
- 5 - www.sg.com.tw • www.fairchildsemi.com
October 30, 2007
5 Page 
Highly Integrated Green-Mode PWM Controller
REFERENCE CIRCUIT
Product Specification
SG5842A/JA
CN1
1
2
3
L1
VZ1
TR1
www.DataSheet4U.com
BD1
C1 L2 C2 4
R1 R5
C5
1
C4 +
C3
D2
R3
R2 R7
U1
1 GND GATE
2 FB VDD
3 VIN SENSE
4 RI
RT
R9 SG5842A/JA
8
7
6
5
R10
THER2
1
R16
Q2
C11 C9 +
R8
Q1
1
T1
3
2
1 L3
2
C6
C7 +
R4
D3
+ C8
Vo+
D1
R6
D4
R12
R11
U2
R13
C10
U3 R
R14
R15
VO+
BOM
Reference
BD1
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
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
LED
Diode BYV95C
TVS P6KE16A
Diode FR103
FUSE 4A/250V
Choke (900µH)
Choke (10mH)
Inductor (2µH)
Diode 20A/100V
© System General Corp.
Version 1.4.2 (IAO33.0026.B6)
Reference
Q2
R1,R2,R5,R7
R3
R4
R6
R8
R9
R10
R11
R12
R13
R14
R15
R16
THER2
T1
U1
U2
U3
VZ1
Component
MOS 7A/600V
R 470Kohm 1/4W
R 100Kohm 1/2W
R 47ohm 1/4W
R 2Kohm 1/8W
R 0.3ohm 2W
R 33Kohm 1/8W
R 4.7Kohm 1/8W
R 470ohm 1/8W
R 0 ohm 1/8W
R 4.7Kohm 1/8W
R 154Kohm 1/8W 1%
R 39Kohm 1/8W 1%
R 100ohm 1/8W
Thermistor TTC104
Transformer (600µH-PQ2620)
IC SG5842A/JA
IC PC817
IC TL431
VZ 9G
- 11 -
www.sg.com.tw • www.fairchildsemi.com
October 30, 2007
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SG5842JA.PDF ] | |
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