DESCRIPTION
RS2139 is a high performance offline PWM Power switch for low power AC/DC charger and adaptor applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the Fig.1.

FEATURES
• 5% Constant Voltage Regulation, 5% Constant
   Current Regulation at Universal AC input
• Primary-side Sensing and Regulation Without
   TL431 and Opto-coupler
• Built-in High-Voltage Power MOSFET
• Power on Soft-start
• Built-in Leading Edge Blanking (LEB)
• Cycle-by-Cycle Current Limiting
• VDD Under Voltage Lockout with Hysteresis
   (UVLO)
• Programmable CV and CC Regulation
• Adjustable Constant Current and Output Power
   Setting
• Built-in Secondary Constant Current Control
   with Primary Side Feedback
• Built-in adaptive current peak regulation
• Built-in Primary winding inductance
   compensation
• Program cable drop compensation
• Sub-micro High-Voltage BiCMOS
• VDD OVP and VDD Clamp
• 5000V HBM ESD
• DIP-8L green packaging

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