SG6840 Ver la hoja de datos (PDF) - Unspecified

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SG6840

High-integrated Green Mode PWM Controller

Unspecified 

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

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