поискавой системы для электроныых деталей
Selected language     Russian  ▼
название детали
         подробно


SF5877 датащит (Datasheet) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

№ деталь SF5877
подробность  HV-mWTM、2nd Generation Quasi-Resonant (QR-IITM ) PWM Controller
скачать  2 Pages
Scroll/Zoom Zoom In 100% Zoom Out
производитель  SIFIRST [SIFIRST TECHNOLOGIES NANHAI LIMITED]
домашняя страница  http://www.sifirsttech.com/en/
Logo 

   
 1 page
background image
©SiFirst Technology
- 1 -
Confidential
SiFirst_DS_5877_V1.0
SF5877
FEATURES
◆ Easily Meet EPS Level 6
◆ Proprietary
QR-II
TM
Technology:
●Digital Anti-jitter for Audio Noise Free
Operation
● Digital Frequency Foldback
● Digital Frequency Jittering
◆ Proprietary
HV-mW
TM
to Achieve Less than
50mW Standby Power
◆ Multi-Mode Operation for High Efficiency
◆ 12.7us Maximum On Time
◆ 80KHz Maximum Frequency Limit
◆ 53KHz Frequency Low Clamping in QR Mode
◆ Maximum 65% Duty Cycle
◆ Adaptive Slope Compensation for CCM Mode
◆ Latch Plug-off Protection
◆ Built-in Soft Start Function
◆ Pin Floating Protection
◆ Built-in Synchronous Slope Compensation
◆ Cycle-by-Cycle Current Limiting
◆ Leading Edge Blanking (LEB)
◆ Constant Power Limiting
◆ VDD UVLO, OVP & Clamp
APPLICATIONS
Offline AC/DC Flyback Converter for
◆ AC/DC Adaptors
◆ SMPS Power Supply
GENERAL DESCRIPTION
SF5877 is a high performance, 2
nd Generation Quasi-
Resonant (QR-II
TM) PWM controller for offline flyback
power converter applications. The built-in proprietary
HV-mW
TM
technology and
QR-II
TM technology with
high level protection features can improve the SMPS
reliability and performance.
In SF5877, the “Digital Anti-Jitter” function can
automatically select and lock a valley at a given
loading,
which
can
achieve
audio
noise
free
operation. On the other hand, the “Digital Frequency
Jittering” function makes the system have superior
EMI performance than conventional QR system.
SF5877 is a multi mode controller. When full loadings,
the IC works in CCM mode or QR mode based on the
AC line input. When the loading goes low, the IC
enters into “Digital Frequency Foldback” mode to
boost power conversion efficiency. When the output
power is very small, the IC enters into burst mode
and can achieve less than 50mW no load power.
SF5877 integrates functions and protections of Under
Voltage
Lockout
(UVLO),
VDD
Over
Voltage
Protection
(VDD
OVP),
Output
Over
Voltage
Protection (Output OVP), Cycle-by-cycle Current
Limiting (OCP), Pin Floating Protection, Over Load
Protection (OLP), Soft Start, VCC Clamping, Gate
Clamping, etc. In SF5877, VDD OVP and Output
OVP
are
latch
mode
protections,
the
other
protections are auto-recovery mode.
SF5877 is available in SOP8 package.
TYPICAL APPLICATION
EMI
Filter
VDD
HV
GND
CS
SF5877
1
7
6
8
2
FB
3
4
5
DEM
TL431
GATE
NC
HV-mW
TM2nd Generation Quasi-Resonant (QR-IITM ) PWM Controller




Html Pages

1  2 


датащит скачать




ссылки URL

Вашему бизинису помогли Аллдатащит?  [ DONATE ]  

Что такое Аллдатащит   |   реклама   |   контакт   |   Конфиденциальность    |   закладка   |   обмен ссыками   |   поиск по производителю
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl