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參數資料
| 型號： | SG6741SZ |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Highly-Integrated Green-Mode PWM Controller |
| 中文描述： | SWITCHING CONTROLLER, 68 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LEAD FREE, SOP-8 |
| 文件頁數： | 1/13頁 |
| 文件大小： | 623K |
| 代理商： | SG6741SZ |
Product Specification
Highly-Integrated Green-Mode PWM Controller
FEATURES
High-voltage start-up
Low operating current (4mA)
Linearly decreasing PWM frequency to 22kHz
Frequency hopping to reduce EMI emission
Peak-current-mode control
Cycle-by-cycle current limiting
Leading-edge blanking
Synchronized slope compensation
Gate output maximum voltage clamp (18V)
V
DD
over-voltage protection (auto restart)
V
DD
under-voltage lockout (UVLO)
Internal open-loop protection
Constant power limit (full AC input range)
APPLICATIONS
SG6741
System General Corp.
Version 1.2.1 (IAO33.0047.B2)
- 1 -
www.sg.com.tw www.fairchildsemi.com
September 19, 2007
General-purpose switch-mode power supplies and
flyback power converters, including:
DESCRIPTION
Power adapters
Open-frame SMPS
The highly integrated SG6741 series of PWM controllers
provides several features to enhance the performance of
flyback converters.
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
TYPICAL APPLICATION
linearly decrease the switching frequency at light-load
conditions. To avoid acoustic-noise problems, the
minimum PWM frequency is set above 22KHz. This
green-mode function enables the power supply to meet
international power conservation requirements. With the
internal high-voltage start-up circuitry, the power loss due
to bleeding resistors is also eliminated. To further reduce
power consumption, SG6741 is manufactured using the
BiCMOS process, which allows operating current as low
as 4mA.
SG6741 integrates a frequency-hopping function that
helps reduce EMI emission of a power supply with
minimum line filters. Its built-in synchronized slope
compensation achieves stable peak-current-mode control.
The proprietary internal line compensation ensures
constant output power limit over a wide range of AC input
voltages, from 90VAC to 264VAC.
SG6741 provides many protection functions. In addition
to cycle-by-cycle current limiting, the internal open-loop
protection circuit ensures safety when an open-loop or
output short-circuit failure occurs. PWM output is
disabled until V
DD
drops below the UVLO lower limit;
then the controller starts again. As long as V
DD
exceeds
about 26V, the internal OVP circuit is triggered.
SG6741 is available in an 8-pin DIP or SOP package.
相關PDF資料 |
PDF描述 |
|---|---|
| SG6846A | Highly Integrated Green-Mode PWM Controller |
| SG6846ACSZ | Highly Integrated Green-Mode PWM Controller |
| SG6846ALSZ | Highly Integrated Green-Mode PWM Controller |
| SG6858 | Low-Cost, Green-Mode PWM Controller for Flyback Converters |
| SG6858DZ | Low-Cost, Green-Mode PWM Controller for Flyback Converters |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SG6742 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6742DZ | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6742HL | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6742HL/HR | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6742HLSY | 功能描述:電流型 PWM 控制器 Current Mode PWM Controller 18V RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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