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Technical content
©SiFirst Technology - 1 - Confidential SiFirst_DS_6072_V1.0 SF6072
FEATURES
◆ Built-in 700V Power BJT ◆ Proprietary NC-Cap/PSR TM (Primary Side Regulation) Control without External Compensation/Filtering Capacitor Needed ◆ 30KHz Max. Frequency Clamping @ Output Short Circuit ◆ ±5% Constant Current (CC) and Constant Voltage (CV) Regulation at Universal AC Input ◆ Proprietary Cable Voltage Drop Compensation in CV Mode ◆ Low Standby Power Under 70mW ◆ Wide VDD Operating Range (7V to 31V) ◆ Compensate for Transformer Inductance Tolerances and Line Voltage Variation ◆ Pin Floating Protection ◆ Cycle-by-Cycle Current Limiting ◆ Built-in Leading Edge Blanking (LEB) ◆ Built-in 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 ◆ Small power adapter ◆ AC/DC LED lighting GENERAL DESCRIPTION SF6072 is a high precision, highly integrated DCM (Discontinuous Conduction Mode) Primary Side Regulation (PSR) power switch for offline small power converter applications. It can directly drive power BJT, which can further lower system cost. SF6072 uses Multi Mode Control to improve efficiency and reliability and to decrease audio noise energy @ light loadings. Around the full load, the system operates in PWM+PFM mode, which improve the system reliability. Unde r light load conditions, the IC operates in PFM mode to achieve excellent regulation and high efficiency, and to achieve less than 70mW standby power. SF6072 also integrates the function of “ Max. Frequency Clamping @ Output Short Circuit ” to limits power BJT Vce spike when output short circuits occurs. SF6072 has built-in proprietary NC-Cap/PSRTM control for CV control, which eliminates external compensation or filtering capacitor. It has built-in cable drop compensation function, which can provide excellent CV performance. SF6072 integrates functions and protections of 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. SF6072 is available in SOIC-7 package. TYPICAL APPLICATION AC IN DC Out 1 NC FB CS GND VDD C C SF6072 NC-Cap/PSRTM (Primary Side Regulation) CV/CC Power Switch SiFirst Confidential
©SiFirst Technology - 2 - Confidential SiFirst_DS_6072_V1.0 SF6072 Pin Configuration
Ordering Information
Part Number Top Mark Package Tape & Reel SF6072TG SF6072TG SOIC-7 Green SF6072TGT SF6072TGT SOIC-7 Green Yes Output Power Table(1) Part Number 230VAC ± 15%(2) 85-265VAC Adapter(3) Adapter(3) SF6072 6.5W 4.5W Note 1. The Max. output power is limited by junction temperature Note 2. 230VAC or 100/115VAC with doublers Note 3. Typical continuous power in a non-ventilated enclosed adapter with sufficient drain pattern as a heat sink at 50 oC ambient. Marking Information YWW: Year&Week code Pin Description Pin Num Pin Name I/O Description 1 NC - No connect. 2 FB I System feedback pin. This cont rol input regulates both the output voltage in CV mode and output current in CC mode based on the flyback voltage of the auxiliary winding. 3 VDD P IC power supply pin. 4 CS I Current sense pin. 5-6 C P High voltage power BJT collector pin.