SG6849 System General, SG6849 Datasheet
SG6849
Manufacturer Part Number
SG6849
Description
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback
Manufacturer
System General
Datasheet
1.SG6849.pdf
(15 pages)
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Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback
FEATURES
APPLICATIONS
Low-power flyback power converters, such as
TYPICAL IC APPLICATION
© System General Corp.
Version 1.0(IRO33.0002.B3)
Linearly Decreasing PWM Frequency
Green-Mode under Light-Load and Zero-Load
Conditions
Constant Voltage (CV) and Constant Current (CC)
No Secondary Feedback
Low Startup Current (5uA)
Low Operating Current (3.6mA)
Leading-Edge Blanking
Constant Power Limit
Universal AC Input Range
Synchronized Slope Compensation
150°C OTP Sensor with Hysteresis
V
Cycle-by-Cycle Current Limiting
Under Voltage Lockout (UVLO)
Fixed PWM Frequency (65kHz/100kHz)
Gate Output Maximum Voltage Clamped at 16.7V
Small SOT-26 Package
Battery chargers for cellular phones, cordless phones,
PDAs, digital cameras, and power tools.
Power adapters for ink jet printers, video game
consoles, and portable audio players.
Open-frame SMPS for TV/DVD standby and other
auxiliary supplies, home appliances, consumer
electronics, and PC 5V standby-power.
Replacements for linear transformers and RCC
SMPS.
DD
Over Voltage Clamping
C
R
IN
IN
V
IN
V D D
GN D
SE NSE
G ATE
D
1
Q 1
R
S
W
- 1 -
AU X
DESCRIPTION
This highly integrated PWM controller provides several
features to enhance the performance of low power flyback
converters. To minimize standby power consumption, the
proprietary green-mode function provides off-time
modulation to linearly decrease the switching frequency
under
green-mode function enables the power supply to easily
meet international power conservation requirements. The
supply voltage V
compensation, to regulate the output voltage without
requiring a conventional TL431 and a photo-coupler.
Another advantage of the SG6849 is that the typical
startup current is only 5uA, while the typical operating
current can be as low as 3.6mA. A large startup resistance
could be used to achieve even higher power conversion
efficiency. Built-in synchronized slope compensation
maintains 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.The SG6849 provides
many protection functions. Pulse-by-pulse current
limiting ensures a constant output current, even if a short
circuit occurs. Also, the internal protection circuit will
disable PWM output, if V
output is clamped at 16.7V to protect the power MOS
from over-voltage damage. The built-in over temperature
protection (OTP) function will shutdown the controller at
150°C with a 20°C hysteresis. The SG6849 is designed to
provide a low-cost total solution for flyback converters. It
is available in a small footprint, 6-pin, SOT-26 package.
light-load
D
O
C
O
DD
and
V
is also used for feedback
O
zero-load
DD
exceeds 22.7V. The gate
Product Specification
conditions.
www.sg.com.tw
Dec.29, 2003
SG6849
This
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