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SG6849-65T PDF预览

SG6849-65T

更新时间： 2024-10-28 20:32:47
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 信息通信管理光电二极管
页数 文件大小 规格书
15页 340K
描述
Switching Regulator/Controller, Current-mode, 70kHz Switching Freq-Max, BICMOS, PDSO6,

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SG6849-65T 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：ObsoleteReach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.85Is Samacsys：N
控制模式：CURRENT-MODEJESD-30 代码：R-PDSO-G6
湿度敏感等级：2A端子数量：6
最高工作温度：85 °C最低工作温度：-30 °C
封装主体材料：PLASTIC/EPOXY封装代码：TSOP
封装等效代码：TSOP6,.11,37封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, THIN PROFILE峰值回流温度（摄氏度）：250
认证状态：Not Qualified子类别：Switching Regulator or Controllers
表面贴装：YES最大切换频率：70 kHz
技术：BICMOS温度等级：OTHER
端子形式：GULL WING端子节距：0.95 mm
端子位置：DUAL处于峰值回流温度下的最长时间：30
Base Number Matches：1

SG6849-65T 数据手册

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Product Specification  
Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback  
SG6849  
FEATURES  
DESCRIPTION  
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Linearly Decreasing PWM Frequency  
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 light-load and zero-load conditions. This  
green-mode function enables the power supply to easily  
meet international power conservation requirements. The  
supply voltage VDD is also used for feedback  
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 VDD exceeds 22.7V. The gate  
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.  
Green-Mode under Light-Load and Zero-Load  
Conditions  
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ꢀ
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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  
VDD Over Voltage Clamping  
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  
APPLICATIONS  
Low-power flyback power converters, such as  
ꢀ
ꢀ
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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, consumer  
electronics, and PC 5V standby-power.  
Replacements for linear transformers and RCC  
SMPS.  
ꢀ
TYPICAL IC APPLICATION  
VIN  
DO  
RIN  
D1  
CO  
VO  
VDD  
W AUX  
Q1  
GATE  
SENSE  
GND  
CIN  
RS  
© System General Corp.  
- 1 -  
www.sg.com.tw  
Apr.06, 2004  
Version 1.2(IRO33.0026.B1)  
1234567...15

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