- 您现在的位置：买卖IC网 > PDF目录19494 > SG684965DY (Fairchild Semiconductor)IC CTRLR PWM GREEN CV/CC 8DIP PDF资料下载
参数资料
| 型号： | SG684965DY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM GREEN CV/CC 8DIP |
| 标准包装： | 59 |
| 输出隔离： | 隔离 |
| 频率范围： | 60kHz ~ 70kHz |
| 输入电压： | 8 V ~ 25 V |
| 输出电压： | 16.7V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
December 2008
SG6849
Low-Power, Green-Mode PWM Flyback Power Controller
without Secondary Feedback
Features
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: 5 μ A
Low Operating Current: 3.6mA
Leading-Edge Blanking (LEB)
Constant Power Limit
Universal AC Input Range
Synchronized Slope Compensation
150 ° C OTP Sensor with Hysteresis
V DD Over-Voltage Clamping
Cycle-by-Cycle Current Limiting
Under-Voltage Lockout (UVLO)
Fixed PWM Frequency: 65kHz
Gate Output Maximum Voltage Clamped at 16.7V
Small SSOT-6 Package
Applications
Low-power, flyback power converters, such as:
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
? 2008 Fairchild Semiconductor Corporation
SG6849 Rev. 1.6.1
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 light-load and zero-load
conditions. This green-mode function enables the
power supply to meet international power conservation
requirements.
The supply voltage V DD is also used for feedback
compensation to regulate the output voltage without
requiring a conventional TL431 and a photo-coupler. An
advantage of the SG6849 is a typical startup current of
only 5μA, while the typical operating current can be as
low as 3.6mA. A large startup resistance can 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 90V AC to 264V AC .
The SG6849 provides many protection functions. Pulse-
by-pulse current limiting ensures a constant output
current, even if a short circuit occurs. The internal
protection circuit disables PWM output if V DD 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 shuts down
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, SSOT-6 package.
Related Resources
AN-6849 - Low Cost, Green-Mode PWM Controller
for Flyback Converters
www.fairchildsemi.com
相关PDF资料 |
PDF描述 |
|---|---|
| IRU1015CM | IC REG LDO ADJ 1.5A TO-263-3 |
| VI-BVT-CY-F1 | CONVERTER MOD DC/DC 6.5V 50W |
| TOP222G-TL | IC OFFLINE SWIT PWM OCP HV 8SMD |
| EYM12DTMH | CONN EDGECARD 24POS R/A .156 SLD |
| TAP475K050CRW | CAP TANT 4.7UF 50V 10% RADIAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SG684965DZ | 功能描述:电流型 PWM 控制器 Low-Pwr Gr-Mode PWM Flybck Ctrl w/o Se RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| SG6849-65T | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low-Power Green-Mode PWM Flyback Power Controller without Secondary Feedback |
| SG684965TZ | 功能描述:电流型 PWM 控制器 Low-Pwr Gr-Mode PWM Flybck Ctrl w/o Se RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| SG68502ASZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG68502SZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
发布紧急采购，3分钟左右您将得到回复。