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SG6858_09

更新时间： 2024-10-28 09:27:39
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 转换器控制器
页数 文件大小 规格书
13页 476K
描述
Low-Cost, Green-Mode, PWM Controller for Flyback Converters

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SG6858_09 数据手册

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September 2009  
SG6858  
Low-Cost, Green-Mode, PWM Controller for Flyback  
Converters  
Features  
Description  
This highly integrated PWM controller provides several  
special enhancements designed to meet the low  
standby-power needs of low-power SMPS. To minimize  
standby power consumption, the proprietary green-  
mode function provides off-time modulation to linearly  
decrease the switching frequency under light-load  
conditions. This green-mode function enables the  
power supply to meet even the strictest power  
conservation requirements.  
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Green-Mode PWM  
Supports the ”Blue Angel” Standard  
Low Startup Current: 10µA (Maximum)  
Low Operating Current: 2.5mA  
Leading-Edge Blanking (LEB)  
Constant Output Power Limit  
Built-in Synchronized Slope Compensation  
Current-Mode Operation  
The BiCMOS fabrication process enables reducing the  
startup current to 10µA and the operating current to  
2.5mA. To further improve power conservation, a large  
startup resistance can be used. Built-in synchronized  
slope compensation ensures the stability of peak-  
current-mode control. Proprietary internal compensation  
provides a constant output power limit over a universal  
AC input range (90VAC to 264VAC). Pulse-by-pulse  
current limiting ensures safe operation even during  
short circuits.  
Cycle-by-Cycle Current Limiting  
Under-Voltage Lockout (UVLO)  
Programmable PWM Frequency  
VDD Over-Voltage Protection with Auto-Restart  
Gate Output Voltage Clamped at 17V  
Few External Components Required  
SSOT-26 and DIP-8 Packages Available  
To protect the external power MOSFET from being  
damaged by supply over voltage, the output driver is  
clamped at 17V. SG6858 controllers can improve the  
performance and reduce the production cost of power  
supplies. The SG6858 replaces linear and RCC-mode  
power adapters. It is available in 8-pin DIP and 6-pin  
SSOT-26 packages.  
Applications  
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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, PC 5V  
standby power, and consumer electronics  
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Replacements for linear transformers and RCC  
SMPS  
Offline High Brightness (HB) LED drivers  
Ordering Information  
Part Number  
Operating Temperature Range  
Package  
Packing Method  
Eco Status  
RoHS  
SG6858TZ  
SG6858DZ  
-40 to +125°C  
-40 to +125°C  
6-Pin SSOT-26  
8-Pin DIP-8  
Tape & Reel  
Tube  
RoHS  
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.  
© 2008 Fairchild Semiconductor Corporation  
SG6858 • Rev. 1.2.4  
www.fairchildsemi.com  
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