The OB2550QMP is a highly integrated and cost-effective PWM power switch optimized for offline flyback converter applications. Manufactured by On-Bright, similar to the OB2550MP, this IC combines a current mode PWM controller and a high voltage power MOSFET. This integration minimizes the number of external components required, which simplifies the design process and reduces the overall cost while maintaining excellent performance and efficiency.

Applications

• Adapters for mobile phones and other portable devices
• Chargers for smartphones, tablets, and power banks
• Small power supplies for home appliances
• LED driver 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 Bill of Materials (BOM) Cost
• Simplified Power Supply Design
• High Efficiency
• Improved System Reliability
• Reduced EMI Emissions

The OB2550QMP is designed to operate in discontinuous conduction mode (DCM), further improving efficiency and reducing switching losses. It also includes internal slope compensation for stable operation across a broad input voltage range. The integrated protection features enhance the reliability and robustness of the power supply design. The frequency jittering feature optimizes EMI performance, facilitating compliance with relevant standards.

Technical Specifications:

• Operating Frequency: Typically around 65 kHz
• Startup Current: Very low to minimize power consumption
• Protection Mechanisms: Over-voltage, Over-temperature, Short-circuit
• Operating Temperature Range: Usually specified between -40°C to +85°C
• Package Type: Available in compact packages suitable for space-saving designs