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SF5773 Folha de dados(PDF) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

Nome de Peças SF5773
Descrição Electrónicos  2nd Generation Quasi-Resonant (QR-IITM ) PWM Controller
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Fabricante Electrônico  SIFIRST [SIFIRST TECHNOLOGIES NANHAI LIMITED]
Página de início  http://www.sifirsttech.com/en/
Logo SIFIRST - SIFIRST TECHNOLOGIES NANHAI LIMITED

SF5773 Folha de dados(HTML) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

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©SiFirst Technology
- 1 -
Confidential
SiFirst_DS_5773_V1.0
SF5773
FEATURES
Easily Meet EPS Level 6
Proprietary
QR-IITM 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
SF5773 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-IITM technology with high level protection
features
improves
the
SMPS
reliability
and
performance.
In SF5773, 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.
SF5773 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.
SF5773 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),
Soft Start, VCC Clamping, Gate Clamping, etc. In
SF5773, the protection functions are auto-recovery
mode protection.
SF5773 is available in SOT23-6 package.
TYPICAL APPLICATION
EMI
Filter
AC IN
VDD
GATE
2 FB
GND
CS
SF5773
DC Out
DEM
3
1
5
4
6
TL431
2nd Generation Quasi-Resonant (
QR-IITM ) PWM Controller


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