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SF5920 Schematic ( PDF Datasheet ) - SiFirst
| Teilenummer | SF5920 |
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| Beschreibung | CV/CC Controller | |
| Hersteller | SiFirst | |
| Logo |  |
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Gesamt 2 Seiten 
SF5920
NC-Cap/PSRTM (Primary Side Regulation) CV/CC Controller
FEATURES
◆ Low Standby Power Under 30mW, Easily to
Pass Energy Star EPS2.0
◆ Proprietary NC-Cap/PSRTM (Primary Side
Regulation) Control without External
Compensation/Filtering Capacitor Needed
◆ ± 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
◆ 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
GENERAL DESCRIPTION
SF5920 is a high performance, highly integrated
DCM (Discontinuous Conduction Mode) Primary Side
Regulation (PSR) controller for offline small power
converter applications.
SF5920 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.
SF5920 has built-in proprietary NC-Cap/PSRTM
control for CV control, which eliminates external
compensation or filtering capacitor. It also has built-in
proprietary 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.
SF5920 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), Pins Floating Protection,
Gate Clamping, VDD Clamping.
SF5920 is available in SOT23-5 package.
TYPICAL APPLICATION
©SiFirst Technology
- 1 - Confidential
SiFirst_DS_5920_V1.3
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| PDF Download | [ SF5920 Schematic.PDF ] | |
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