FEATURES
◆ Meet EPS Level 6
◆ Built-in 600V Power MOSFET
◆ Proprietary super-QR/PSRTM (Quasi-
Resonant & Primary Side Regulation) Control
for High Efficiency and Low EMI
◆ Proprietary Cable Drop Compensation
◆ Max. Frequency Clamping to Limit Power
MOSFET Vds Spike @ Output Short Circuit
◆ Less than 70mW Standby Power
◆ ±5% CC and CV Precision
◆ Multi-Mode Control
◆ Cycle-by-Cycle Current Limiting
◆ Leading Edge Blanking (LEB)
◆ Soft Start
◆ Output Over Voltage Protection
◆ VDD UVLO, OVP & Clamp
APPLICATIONS
◆ Battery chargers for cellular phones, cordless
phones, PDA, digital cameras, etc
◆ Replaces linear transformer and RCC SMPS
◆ AC/DC LED lighting
GENERAL DESCRIPTION
SF6778S is a high performance, highly integrated QR
(Quasi Resonant Mode) and Primary Side Regulation
(PSR) power switch for offline small power converter
applications.
SF6778S has proprietary super-QR/PSRTM control
for high efficiency and low EMI, which can ensure
system to meet EPS Level 6 energy standard. The IC
also has built-in cable drop compensation function to
achieve excellent CV performance.
SF6778S uses Multi Mode Control to improve
efficiency and reliability and to decrease audio noise
energy @ light loadings. SF6778S also integrates the
function of “Max. Frequency Clamping @ Output
Short Circuit” to limits power MOSFET Vds spike
when output short circuits occurs.
SF6778S integrates functions and protections of FB
Short Protection, Under Voltage Lockout (UVLO),
VDD Over Voltage Protection (VDD OVP), Output
Over Voltage Protection (Output OVP), Soft Start,
Cycle-by-cycle Current Limiting (OCP), Pin Floating
Protection, VDD Clamping.
SF6778S is available in DIP8 package.
TYPICAL APPLICATION
AC IN
SF6778S
1 VDD GND 8
2 FB GND 7
3 CC
4 CS
Drain 6
Drain 5
DC Out
Pin Configuration
©SiFirst Technology
- 1 - Confidential
SiFirst_DS_6778S_V1.0
