super-QR/PSRTM CV/CC Controller
SF6771S
FEATURES
◆ Easily Meet EPS Level 6
◆ Less than 75mW Standby Power
◆ Proprietary super-QR/PSRTM (Quasi-
Resonant & Primary Side Regulation) Control
for High Efficiency and Low EMI
◆ ±5% CC and CV Precision
◆ Proprietary Cable Drop Compensation
◆ Smart Output Short Protection
◆ Cycle-by-Cycle Current Limiting
◆ Built-in Leading Edge Blanking (LEB)
◆ Pin Floating Protection
◆ Built-in Soft Start
◆ Output Over Voltage Protection
◆ VDD OVP & Clamp
◆ VDD Under Voltage Lockout (UVLO)
APPLICATIONS
◆ Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, etc
◆ Replaces linear transformer and RCC SMPS
◆ AC/DC LED lighting
GENERAL DESCRIPTION
SF6771S is a high performance, highly integrated QR
(Quasi Resonant Mode) and Primary Side Regulation
(PSR) controller for offline small power converter
applications.
SF6771S has proprietary super-QR/PSRTM control
for high efficiency and low EMI. The standby power is
less than 75mW @230VAC. Thus, the IC can meet
EPS Level 6 energy standard easily. The IC also has
built-in cable drop compensation function, which can
provide excellent CV performance.
SF6771S integrates functions and protections of
Under Voltage Lockout (UVLO), VDD Over Voltage
Protection (VDD OVP), Soft Start, Cycle-by-cycle
Current Limiting (OCP), Pin Floating Protection, Gate
Clamping, VDD Clamping.
SF6771S is available in SOT23-6 package.
TYPICAL APPLICATION
AC IN
VDD FB GATE
CC CS
GND
©SiFirst Technology
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Confidential
SiFirst_DS_6771S_V1.1
