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| 型号： | SG684965TZ |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM UVLO CV/CC SSOT6 |
| 标准包装： | 3,000 |
| 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： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | 6-SSOT |
| 包装： | 带卷 (TR) |
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG68502ASZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG68502SZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6858 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Low-Cost, Green-Mode PWM Controller for Flyback Converters |
| SG6858_09 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Low-Cost, Green-Mode, PWM Controller for Flyback Converters |
| SG6858DZ | 功能描述:开关变换器、稳压器与控制器 Low Cost Grn Mode PWM Cntrl RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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