OB2502PCPA

OB2502P is a high performance offline PSR power switch for low power AC/DC charger and adapter 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. OB2502P is a cost effective PSR power switch optimized for off-line low power AC/DC applications including battery chargers. It operates in primary side sensing and regulation, thus opto-coupler and TL431 are not required. Proprietary built-in CV and CC control can achieve high precision CC/CV control meeting most charger application requirements.

Applications

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

Key features

• Primary-side sensing and regulation without TL431 and opto-coupler
• High precision constant voltage and current regulation at universal AC input
• Multi-mode PWM/PFM operation for efficiency improving
• Integrated 2A 650V MOSFET
• Good dynamic response with synchronous rectifier application
• Programmable CV and CC regulation
• Built-in primary winding inductance compensation
• Programmable cable drop compensation
• No need for control loop compensation
• Audio noise free operation
• Built-in leading edge blanking (LEB)
• Ultra low start-up current and low operating current
• Comprehensive protection coverage with auto-recovery
• On-chip OTP
• VDD over voltage protection
• VDD under voltage lockout with hysteresis (UVLO)
• Cycle-by-Cycle current limiting
• Feedback loop open protection
• Output short circuit protection