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SF5773S Scheda tecnica(PDF) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

Il numero della parte SF5773S
Spiegazioni elettronici  Easily Meet EPS Level 6
Download  2 Pages
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Produttore elettronici  SIFIRST [SIFIRST TECHNOLOGIES NANHAI LIMITED]
Homepage  http://www.sifirsttech.com/en/
Logo SIFIRST - SIFIRST TECHNOLOGIES NANHAI LIMITED

SF5773S Scheda tecnica(HTML) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

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©SiFirst Technology
- 1 -
Confidential
SiFirst_DS_5773S_V1.0
FEATURES
◆ Easily Meet EPS Level 6
◆ AC Brownout Protection (BOP)
◆ Proprietary
QR-II
TM
Technology:
●Digital Anti-jitter for Audio Noise Free
Operation
● Digital Frequency Foldback
● Digital Frequency Jittering for Better EMI
◆ Less than 100mW Standby Power
◆ Multi-Mode Operation for High Efficiency
◆ 12.7us Maximum On Time
◆ 80KHz Maximum Frequency Limit
◆ 52KHz Frequency Low Clamping in QR Mode
◆ 65% Maximum Duty Cycle
◆ Adaptive Slope Compensation for CCM Mode
◆ 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
SF5773S is a high performance, 2
nd
Generation
Quasi-Resonant (QR-II
TM) PWM controller for offline
flyback power converter applications. The built-in
proprietary
QR-II
TM
technology
with
high
level
protection features improves the SMPS reliability and
performance.
In SF5773S, 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.
SF5773S 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 100mW no load
power.
SF5773S integrates functions and protections of
Under Voltage Lockout (UVLO), VCC Over Voltage
Protection (OVP), Output Over Voltage Protection
(Output OVP), Cycle-by-cycle Current Limiting (OCP),
Pin Floating Protection, Over Load Protection (OLP),
AC Brownout Protection, Soft Start, VCC Clamping,
Gate Clamping, etc. In SF5773S, the protection
functions are auto-recovery mode protection.
SF5773S is available in SOT23-6 package.
TYPICAL APPLICATION
EMI
Filter
AC IN
VDD
GATE
2 FB
GND
CS
SF5773S
DC Out
DEM
3
1
5
4
6
TL431
Pin Configuration


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