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參數資料
| 型號： | SG5842A |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Highly Integrated Green-Mode PWM Controller |
| 中文描述： | 高度集成的綠色模式PWM控制器 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 481K |
| 代理商： | SG5842A |
Product Specification
Highly Integrated Green-Mode PWM Controller
FEATURES
Green-Mode PWM Controller
Low Start-up Current (14μA)
Low Operating Current (4mA)
Programmable PWM Frequency with Hopping
(5842JA)
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Synchronized Slope Compensation
Leading-Edge Blanking
Constant Output Power Limit
Totem Pole Output with Soft Driving
V
DD
Over-Voltage Protection (OVP)
Programmable Over-Temperature Protection (OTP)
Internal Latch Circuit (OTP, OVP)
Internal Open-Loop Protection
V
DD
Under-Voltage Lockout (UVLO)
GATE Output Maximum Voltage Clamp (18V)
SG5842A/JA
System General Corp.
Version 1.4.2 (IAO33.0026.B6)
- 1 -
www.sg.com.tw www.fairchildsemi.com
October 30, 2007
APPLICATIONS
General-purpose switch mode power supplies and flyback
power converters, including:
Notebook Power Adapters
Open-Frame SMPS
DESCRIPTION
The highly integrated SG5842A/JA 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
continuously decrease the switching frequency at
light-load conditions. To avoid acoustic-noise problem,
the minimum PWM frequency set above 22KHz. This
green-mode function enables the power supply to meet
international power conservation requirements. To further
reduce
power
consumption,
manufactured using the BiCMOS process. This allows a
low start-up current, around 14μA, and an operating
current of only 4mA. As a result, a large start-up
resistance can be used.
SG5842A/JA
is
The
compensation achieves stable peak-current-mode control.
SG5842A/JA
built-in
synchronized
slope
SG5842JA integrates a frequency hopping function that
helps reduce EMI emission of a power supply with
minimum line filters.
SG5842A/JA provides many protection functions. In
addition to cycle-by-cycle current limiting, the internal
open-loop protection circuit ensures safety should an open
loop or output short-circuit failure occur. 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 24V, the internal OVP circuit is triggered. An
external
NTC
thermistor
over-temperature protection.
can
be
applied
for
SG5842A/JA is available in an 8-pin DIP or SOP package.
TYPICAL APPLICATION
SG5842A/JA
相關PDF資料 |
PDF描述 |
|---|---|
| SG5842ADZ | Highly Integrated Green-Mode PWM Controller |
| SG5842JA | Highly Integrated Green-Mode PWM Controller |
| SG5842JADZ | Highly Integrated Green-Mode PWM Controller |
| SG5842JASZ | Highly Integrated Green-Mode PWM Controller |
| SG6105A | Power Supply Supervisor + Regulator + PWM |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SG5842A_09 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG5842ADZ | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG5842ASY | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG5842ASZ | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG5842BSZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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