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Technical content
©SiFirst Technology - 1 - Confidential SiFirst_DS_6761S_V1.0 SF6761S
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 SF6761S is a high performance, highly integrated QR (Quasi Resonant Mode) and Primary Side Regulation (PSR) controller for offline small power converter applications. SF6761S 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. SF6761S integrates functions and protections of Under Voltage Lockout (UV LO), V DD Over Voltage Protection ( VDD OVP), Soft Start, Cycle-by-cycle Current Limiting (OCP), Pin Floating Protection, Gate Clamping, VDD Clamping. SF6761S is available in SOT23-6 package. TYPICAL APPLICATION AC IN CS GATEFBVDD GND SF6761S CC super-QR/PSRTM CV/CC Controller Sifirst Confidential
©SiFirst Technology - 2 - Confidential SiFirst_DS_6761S_V1.0 SF6761S Pin Configuration GATE GND 4VDD FB CC CS SOT23-6
Ordering Information
Part Number Top Mark Package Tape & Reel SF6761SLGT 61SYW SOT23-6 Green Yes Marking Information 6 1 S Y W Dot: Pin1 Mark 61S:Part number SF6761S YW: Year&Week Code Pin Description Pin Num Pin Name I/O Description 1 GATE O Totem-pole gate driver output to drive the external MOSFET.
2 GND P Ground
3 VDD P IC power supply pin. 4 CS I Current sense pin. 5 CC O Connect a capacitor between this pin and GND for CC regulation. 6 FB I System feedback pin. This control input regulates both the output voltage in CV mode and output current in CC mode based on the flyback voltage of the auxiliary winding. Sifirst Confidential