The LD7282PJ-19 is a highly integrated current mode PWM controller optimized for high performance, low standby power, and cost-effective offline flyback converter applications. This Leadtrend controller incorporates a comprehensive set of features to simplify the design of power supplies, ensuring reliability and efficiency.

Applications:

• Power adapters for laptops, mobile phones, and other portable devices
• Open-frame power supplies for consumer electronics
• Auxiliary power supplies in larger systems
• Standby power supplies
• Battery chargers

Features:

• Current-Mode PWM Control: Provides inherent line voltage feed-forward for improved line transient response and simplified control loop design.
• Low Startup Current: Minimizes startup resistance requirements and improves efficiency.
• Cycle-by-Cycle Current Limiting: Protects the power MOSFET from overcurrent conditions.
• Over Voltage Protection (OVP): Prevents output voltage from exceeding safe levels.
• Over Load Protection (OLP): Protects the power supply from excessive load demands.
• Short Circuit Protection (SCP): Shuts down the power supply in the event of a short circuit.
• Under Voltage Lockout (UVLO): Ensures proper operation during startup and prevents erratic behavior at low voltages.
• Frequency Jittering: Reduces EMI emissions for improved compliance with regulatory standards.
• Built-in soft start function to reduce the stress on the MOSFET and secondary diode during start-up.

Benefits:

• High Efficiency: Minimizes power losses, reducing operating costs and heat generation.
• Robust Protection: Ensures reliable operation and prevents damage to the power supply and connected devices.
• Simplified Design: Reduces component count and simplifies PCB layout, lowering development costs and time-to-market.
• Low Standby Power: Meets stringent energy efficiency requirements.
• Improved EMI Performance: Simplifies compliance with regulatory standards.

Additional Details:

The LD7282PJ-19 operates with a fixed switching frequency, allowing for optimized performance and minimized EMI. It also features a built-in slope compensation to prevent subharmonic oscillation at high duty cycles. The device is available in a compact package, making it suitable for space-constrained applications. The integrated protection features safeguard against various fault conditions, enhancing system reliability and longevity. The precise control offered by the current-mode PWM scheme ensures stable and efficient power delivery across a wide range of operating conditions. The IC is designed to be compatible with a variety of external components, offering flexibility in design. The soft-start feature reduces stress on the MOSFET and secondary diode, increasing overall system reliability.