ON Semiconductor NCP1377B PWM Controller

The NCP1377B from ON Semiconductor is a highly efficient, soft-switching pulse-width modulation (PWM) controller designed for use in switched-mode power supplies (SMPS). With its advanced features and robust design, the NCP1377B provides an optimal solution for power supply applications requiring low standby power consumption and excellent EMI performance.

This innovative controller integrates a fixed-frequency current-mode control scheme with a unique skip-cycle capability, significantly reducing the power consumption under light-load conditions. The skip mode assists in meeting energy-saving standards by lowering the switching frequency at no load and during standby without compromising the output voltage regulation.

Key Features:

• Current-Mode Operation: The NCP1377B's current-mode control provides fast transient response and excellent loop stability, making it ideal for a wide range of power supply designs.
• Adjustable Switching Frequency: The device offers a programmable frequency range, allowing designers to tailor the switching frequency to their specific application needs.
• Dynamic Self-Supply: This feature eliminates the need for an auxiliary winding or external bias supply, simplifying the power supply design and reducing overall component count.
• Built-in Frequency Jittering: The frequency jittering reduces EMI emissions, facilitating compliance with international EMI standards and reducing the need for additional filtering components.
• Auto-Recovery Overvoltage Protection: The NCP1377B provides enhanced system reliability through its overvoltage protection circuit, which automatically recovers once the fault condition is removed.
• Short-Circuit Protection: A robust protection mechanism ensures the controller shuts down in the event of a short-circuit, preventing damage to the IC and the power supply.

The NCP1377B is packaged in a compact PDIP-7 or SOT-223, making it suitable for space-constrained applications. Its high level of integration and comprehensive protection features make it an excellent choice for designing power supplies in consumer electronics, such as LCD monitors, TV sets, and other low-power standby applications.

With the NCP1377B, ON Semiconductor continues to deliver performance and efficiency, driving innovation in the power management space and enabling designers to create more energy-efficient power supply solutions.