WS2268
Primary Side AC/DC Controller
Gerneral Description
Features
■ Lower no-load power
■ Lower start-up current
The WS2268 is a high performance AC/DC power
supply controller for battery charger and adapter
applications. The device uses Pulse Frequency
Modulation (PFM) method to build discontinuous
conduction mode (DCM) flyback power supplies.
The WS2268 provides accurate constant voltage,
constant current (CV/CC) regulation without requiring
the opto-coupler and the secondary control circuitry.
It also eliminates the need of loop compensation
circuitry while maintaining stability.
■ Built-in cable compensation
■ Built-in peak current compensation
■ Random frequency modulation to reduce system EMI
■ Built-in leading edge blanking
■ Current limited protection in each cycle
■ Over voltage protection
The WS2268 achieves excellent regulation and
high power efficiency, the no-load power
consumption is less than 100mW.
■ Open circuit protection
■ Under voltage lockout
The WS2268 is available in SOP8 package.
Application
■ Adapters/Chargers for Cell/Cordless phones, PDAs, MP3
and other portable apparatus
■ Standby and Auxiliary power supplies
Typical Application
WS2268
Rev. 2 Jan.2012
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T21-2
WINSEMI [ SHENZHEN WINSEMI MICROELECTRONICS CO., LTD ]
