The OB2550MP is a highly integrated and cost-effective PWM power switch optimized for offline flyback converter applications. Manufactured by On-Bright, this integrated circuit (IC) incorporates a current mode PWM controller and a high voltage power MOSFET, minimizing external components and simplifying design while maintaining high performance and efficiency.

Applications

• Adapters for mobile devices (smartphones, tablets)
• Chargers for various electronic devices
• Standby power supplies
• LED lighting applications

Features

• Integrated high voltage power MOSFET
• Current mode PWM control
• Low startup current
• Cycle-by-cycle current limiting
• Over voltage protection (OVP)
• Over temperature protection (OTP)
• Short circuit protection (SCP)
• Frequency jittering for improved EMI performance

Benefits

• Reduced BOM (Bill of Materials) cost due to high integration
• Simplified power supply design
• Improved efficiency compared to discrete solutions
• Enhanced system reliability due to built-in protections
• Lower EMI emissions

The OB2550MP operates in discontinuous conduction mode (DCM), which further enhances efficiency and reduces switching losses. The internal slope compensation ensures stable operation across a wide input voltage range. The IC's comprehensive protection features, including over-voltage, over-temperature, and short-circuit protection, significantly improve the reliability and robustness of the power supply. The frequency jittering feature helps to spread the EMI energy, simplifying compliance with EMI regulations.

Technical Specifications:

• Operating Frequency: Typically around 65kHz
• Startup Current: Very low, typically in the microampere range
• Protection Features: OVP, OTP, SCP
• Operating Temperature Range: Typically -40°C to +85°C
• Package: Available in various compact packages suitable for space-constrained applications