DESCRIPTION
RS2122A is a high performance offline PSR controller for low power AC/DC charger and adapter applications. It operates in primary-side sensing and regulation, so opto-coupler and TL431 could be eliminated. In CC control, the current and output power setting can be adjusted externally by the sense resistor RS at CS pin. In CV control, PFM operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is achieved by the built-in cable drop compensation.

FEATURES
• Low startup current
• ±4% CC and ±5% CV Precision
• Primary-side Sensing and Regulation Without TL431
   and Opto-coupler
• High precision constant voltage and current regulation
   at universal AC input
• Programmable CV and CC Regulation
• Built-in Primary winding inductance compensation
• Programmable Cable Drop Compensation
• Built-in Feedback Loop Open Protection
• Built-in CS Open Protection
• VDD Over Voltage Protection
• Built-in Output Short Circuit Protection
• Built-in Leading Edge Blanking (LEB)
• Over temperature protection(OTP)
• Cycle-by-Cycle Current Limiting
• VDD Under Voltage Lockout with Hysteresis (UVLO)
• SOP-7L green Packaging

APPLICATIONS
• Switching AC/DC Small Power Adaptor
• Cell Phone or Digital Cameras Charger
• Auxiliary Power for PC, TV etc
• Linear Regulator/RCC Replacement