NCP1280DR2

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The NCP1280DR2 is a PFC converter with an integrated, self-starting standard Critical Conduction Mode (CCM) Flyback controller. It is designed to meet the efficiency and cost reduction requirements of small power adapters with 8 W to 50 W power levels. This article will provide an overview of the NCP1280DR2\'s application field and working principle.

Application Field

The NCP1280DR2 is well-suited for offline LED lighting, lighting control applications, and off-line flyback converters. It is capable of universal AC input operation and provides a cost-effective solution for AC/DCFlyback converters with PFC. Its improved efficiency allows for fewer components, creating a simpler and lighter design, making it the ideal choice for high efficiency systems.

The NCP1280DR2 has a shutdown synchronization feature that simplifies the design complexity without compromising efficiency. Its wide temperature range of -40°C to 125°C meets the demands of harsh environmental applications. Additionally, it integrates four SOIC-8 devices, reducing PCB area and cost.

Working Principle

The NCP1280DR2 is a two-stage power conversion solution that consists of a primary stage PFC controller and a secondary stage CCM flyback. The PFC controller integrates a MOSFET, rectifier, and control circuitry in one package to drive a synchronous rectifier and boost converter. The boost converter uses an active power factor correction circuit to filter out ac rippling and adjust neutral-point potential. The input power factor is over 0.95, and the Total harmonic distortion (THD) is less than 20%.

In the secondary stage, the NCP1280DR2 implements a standard Critical Conduction Mode (CCM) Flyback, wherein a single auxiliary winding is used to provide the required bias voltage for the aux winding transformer. This results in improved efficiency and lower EMI noise, making it the ideal choice for applications with higher power requirements. During steady-state operation, the internal regulator ensures a fixed output voltage. For the under-voltage detection, the robust DC voltage regulation functions monitors the output voltage and shuts down the output if the voltage is lower than the set threshold.

The NCP1280DR2 provides a soft-start feature to allow the system to power up smoothly. This feature also prevents large current peaks and reduces the peak input power. A selectable burst mode operation allows for additional power saving at light loads, and can achieve up to 75% efficiency at light load conditions. Finally, the integrated Brown-Out protection prevents the system from starting up abnormally when the input voltage is low.

Conclusion

The NCP1280DR2 is a cost-effective PFC converter with integrated self-starting and standard Critical Conduction Mode (CCM) Flyback controller. Its wide-temperature range and narrow design flexibility make it an ideal choice for applications with high demands on efficiency, cost and performance. The PFC circuit ensures high power factor and adjustable voltage regulation, while the overload protection provides system safety. The Burst Mode and soft-start features allow the system to start up smoothly and improve operation efficiency, while the integrated Brown-Out protection prevents the system from starting up abnormally when the input voltage is low.

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