SG6840 Datasheet, PDF (1/11 Pages) List of Unclassifed Manufacturers – HIGH INTEGRATED PWM CONTROLLER

SG6840
Product Specification
DESCRIPTION
SG6840 Data Sheet
FEATURES OVERVIEW
This high-integrated PWM controller provides
several special enhancements to satisfy the
needs for low power standby and protection
features. In standby mode, PWM frequency
reduction is used to lower the power consump-
tion and support a stable output voltage. Due to
Bi-CMOS process, the SG6840 reduces start-
up and operation current to achieve a higher
efficiency power conversion. Start-up current
has been reduced to 30uA typical and operating
current has been shrunk to 3mA. The SG6840
is a fixed frequency PWM controller in normal
operation; its patented green-mode function will
decrease the PWM frequency in response to
the decrease of the load. This green function
dramatically reduces the power loss in no load
and light load conditions that assist the power
supply to meet the power conservation require-
ment. The proprietary synchronized slope com-
pensation ensures the stability of the current
loop for continuous-mode operation. Built-in line
-voltage compensation maintains an identical
output power for a wide input range. An NTC
thermistor is applied to sense the temperature
for over-temperature protection. The SG6840 is
available in 8-pin DIP and SO packages.
●Green-mode PWM to support “Blue Angle”Norm
●Low start up current 30uA
●Low operation current 3mA
●Leading-edge blanking
●Built-in synchronized slope compensation
●Totem pole output includes soft driving
●Constant output power
●Current mode operation
●Cycle-by-cycle current limiting
●Under voltage lockout (UVLO)
●Short circuit protection
●Programmable over-temperature protection
●Few external components & low cost solution
PIN CONFIGURATION
APPLICATIONS
General-purpose switching mode power sup-
plies and flyback power converters, and
●Power Adapter
●Open-frame SMPS
●Battery Charger Adapter
2002 System General Corporation
-1-
Ver1.0
http://www.sg.com.tw