900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






System General

SG6842 Datasheet Preview

SG6842 Datasheet

Highly Integrated Green-Mode PWM Controller

No Preview Available !

Preliminary Specification
Hwwigwh.Dlya-tIanStheegert4aUte.cdomGreen-Mode PWM Controller
FEATURES
Linearly decreasing PWM frequency
Burst-mode at light load and zero load
Low start-up current (20uA)
Low operating current (4mA)
Internal latch circuit for OTP, OVP
Leading-edge blanking
Built-in synchronized slope compensation
Totem pole output with soft driving
Improved EMI
Constant power limit over a universal AC input
range
Current mode operation
Cycle-by-cycle current limiting
Under Voltage Lockout (UVLO)
Programmable PWM frequency
GATE output maximum voltage clamped at 18V
VDD Over Voltage Protection (OVP)
Programmable Over Temperature Protection (OTP)
Very few external components are required
APPLICATIONS
General-purpose switch mode power supplies and
flyback power converters, including:
Power adapters
Open-frame SMPS
Battery Charger Adapter
DESCRIPTION
The highly integrated SG6842 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 linearly decrease the
switching frequency under light-load conditions. Under
SG6842
zero-load conditions, the power supply enters burst-mode.
This completely shuts off PWM output. Then, the output
restarts just before the supply voltage, VDD, drops below
the UVLO voltage. This green-mode function enables the
power supply to easily meet international power
conservation requirements.
For improved power conversion efficiency, the
SG6842 series is manufactured using the BiCMOS
process. This allows the start-up current to be reduced to
20uA, and the operating current to be reduced to 4mA.
For even higher power conversion efficiency, a large
start-up resistance can be used.
Built-in synchronized slope compensation ensures
the stability of peak current mode control. Proprietary
internal compensation ensures constant output power
limiting over a universal range of AC input voltages, from
90VAC to 264VAC.
SG6842 controllers provide many protection
functions. Pulse-by-pulse current limiting ensures a
constant output current, even when short circuits occur.
Should an open circuit failure occur in the feedback loop,
the internal protection circuit will disable PWM output.
PWM output will be disabled as long as VDD remains
higher than 26V. The gate output is clamped at 18V to
protect the power MOS from over-voltage damage. An
external NTC thermistor can be applied to sense the
ambient temperature for over temperature protection.
When either over temperature conditions or VDD over
voltage faults are detected, an internal latch circuit is used
to latch-off the controller. The latch will reset when the
temperature cools off sufficiently, or when the VDD
power supply is disabled.
SG6842 series controllers are available in both 8-pin
DIP and SO packages.
TYPICAL APPLICATION
RA
RT
From bridge rectifier
127~ 373VDC
RIN
VIN
RT
C IN
VDD
GATE
RI SG6842
SENSE
RI
FB
GND
D1 From auxiliary
winding
Rg Q1
RS
© System General Corp.
Version 0.1(IRO33.0009.B0)
-1-
www.sg.com.tw
Apr.09, 2003




System General

SG6842 Datasheet Preview

SG6842 Datasheet

Highly Integrated Green-Mode PWM Controller

No Preview Available !

Hwwigwh.Dlya-taInStheegert4aUte.cdomGreen-Mode PWM Controller
MARKING DIAGRAMS
Preliminary Specification
SG6842
PIN CONFIGURATION
8
SG6842BFVT
XXXXXXXYYWWV
1
B: B = Linearly Decreasing
Frequency + Burst-Mode:
Null = Linear
F: L = OTP Latch: The pin is
reset when AC is
disconnected.
C = Hysteresis OTP : The
pin is reset when the
temperature cools down.
V: V = OVP Latch
T: D = DIP, S = SOP
XXXXXXX: Wafer Lot
YY: Year; WW: Week
V: Assembly Location
GND
FB
VIN
RI
1
2
3
4
8 GATE
7 VDD
6 SENSE
5 RT
ORDERING INFORMATION
The SG6842 family of controllers is distinguished for its protection features and burst-mode functionality.
Part Number
SG6842BS
SG6842BD
SG6842BLS
SG6842BLD
SG6842BCS
SG6842BCD
SG6842BLVS
SG6842BLVD
SG6842BCVS
SG6842BCVD
Green-Mode Function: Linearly Decreasing Frequency and Burst-Mode
OTP Latch:
Reset when AC is
unplugged (L).
Hysteresis OTP:
Reset when the
temperature cools down
(C).
OVP Latch:
Reset when AC is
unplugged (V).
b
b
b
b
b
b
Package
8-Pin SOP
8-Pin DIP
8-Pin SOP
8-Pin DIP
8-Pin SOP
8-Pin DIP
8-Pin SOP
8-Pin DIP
8-Pin SOP
8-Pin DIP
© System General Corp.
Version 0.1(IRO33.0009.B0)
-2-
www.sg.com.tw
Apr.09, 2003


Part Number SG6842
Description Highly Integrated Green-Mode PWM Controller
Maker System General
PDF Download

SG6842 Datasheet PDF






Similar Datasheet

1 SG6840 Highly Integrated Green-Mode PWM Controller
ETC
2 SG6841 High-integrated Green-mode PWM Controller
System General
3 SG6842 Highly Integrated Green-Mode PWM Controller
System General
4 SG6842J Highly-Integrated Green-Mode PWM Controller
System General
5 SG6846 Highly-Integrated Green-Mode PWM Controller
ETC
6 SG6846A Highly-Integrated Green-Mode PWM Controller
ETC
7 SG6846A Highly Integrated Green-Mode PWM Controller
Fairchild Semiconductor
8 SG6846B Highly Integrated Green-Mode PWM Controller
Fairchild Semiconductor
9 SG6846C Highly Integrated Green-Mode PWM Controller
Fairchild Semiconductor





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy