High Precision Primary Side Regulation (PSR) CV/CC Power Switch
Softwin swAides
SF5928
High Precision Primary Side Regulation (PSR) CV/CC Power Switch
FEATURES
◆ Built-in 600V Powe...
Description
Softwin swAides
SF5928
High Precision Primary Side Regulation (PSR) CV/CC Power Switch
FEATURES
◆ Built-in 600V Power MOSFET
◆ Low Standby Power Under 30mW, Easily to
Pass Energy Star EPS2.0
◆ Primary Side Regulation (PSR) without TL431
and Opto-Coupler
◆ ± 5% Constant Current (CC) and Constant
Voltage (CV) Regulation at Universal AC Input
◆ Proprietary
Cable
Voltage
Drop
Compensation in CV Mode
◆ Compensate for Line Voltage Variation
◆ Compensate for Transformer Inductance
Tolerances
◆ Built-in Control Loop Compensation in CV
Mode
◆ All Pins Floating Protection
◆ PFM Control Eases EMI Design
◆ Cycle-by-Cycle Current Limiting
◆ Built-in Leading Edge Blanking (LEB)
◆ 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 ◆ Small power adapter ◆ AC/DC LED lighting
TYPICAL APPLICATION
GENERAL DESCRIPTION
SF5928 is a high performance, highly integrated DCM (Discontinuous Conduction Mode) Primary Side Regulation (PSR) power switch for offline small power converter applications. SF5928 uses Pulse Frequency Modulation (PFM) control to improve efficiency and eases system EMI design. The IC dramatically lowers system cost by eliminating the opto-coupler and secondary control circuits. It also can provide very tight output voltage regulation (CV), in addition to output...
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