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SF5928 Dataheets PDF



Part Number SF5928
Manufacturers SiFirst
Logo SiFirst
Description High Precision Primary Side Regulation (PSR) CV/CC Power Switch
Datasheet SF5928 DatasheetSF5928 Datasheet (PDF)

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 Tol.

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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 current control (CC) ideal for charging applications. SF5928 has Error Amplifier (EA) CV with built-in loop compensation network for CV control, which eliminates external compensation circuitry. It has built-in cable drop compensation function, which can provide excellent CV performance. The IC also has built-in soft start function to soften the stress on the MOSFET during power on period. Under light load conditions, the IC decreases switching frequency to achieve excellent regulation and high efficiency, yet meets the requirement for no-load consumption less than 30mW. SF5928 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), All Pins Floating Protection, VDD Clamping. SF5928 is available in DIP8 package. AC IN SF5928 1 VDD GND 8 2 NC GND 7 3 FB 4 CS Drain 6 Drain 5 DC Out © - 1 - _DS_5928_V1.0 Softwin swAides Pin Configuration VDD NC FB CS 18 DIP8 27 36 45 GND GND Drain Drain SF5928 Ordering Information Part Number Top Mark SF5928DP SF5928DP DIP8 Output Power Table(1) Part Number SF5928 230VAC ± 15%(2) Adapter(3) 18W Package RoHs Tape & Reel 85-265VAC Adapter(3) 13W 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 .


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