NCP1612ADR2G Integrated Circuits (ICs)

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NCP1612ADR2G Application Field and Working Principle

Introduction

The NCP1612ADR2G is an advanced power factor correction (PFC) "slide window" controller IC. It is designed for offline SMPS applications requiring continuous conduction mode of operation up to the 400 W output range. This PFC controller IC has built-in features to simplify the design, such as Digital Soft-Start, Multiphase Interlaced PFC control and Enhanced Valley Detection, provide uniform and reliable device operation. The NCP1612ADR2G is a safe and reliable solution for power supply design.

Application Field

The NCP1612ADR2G enables designers to build power factor correction circuits for various types of power supplies up to the 400 W output range including applications such as industrial equipment, computer and equipment, white goods, air conditioners, LED lighting and plasma display. The NCP1612ADR2G also provides design independence from EMI filter requirements, system control schemes and, allowing implementation of a variety of different solutions.

Working Principle

The NCP1612ADR2G device is based on a slide window technique that regulates a power factor greater than 0.95. The device can be operated in continuous conduction mode with a minimum amount of magnetic components. The NCP1612ADR2G is optimized to work with low ripple current inductors. This reduces the size of the filter, required EMI components, and associated stress on the MOSFET.

When energized, the NCP1612ADR2G device starts by an internal digital Soft-Start and runs through several phases. The first phase is the current limit phase. When the energy stored in the PFC inductor is higher than the energy being fed to the output, then an open loop characteristic is formed and the voltage across the inductor reaches its peak and the output current reaches its maximum. The second phase is the valley detection phase. In this phase the voltage across the inductor drops sharply and the output current is reduced to the minimum voltage. The third phase is the PFC regulation phase. In this phase the inductor current is regulated in order to maintain the power factor above 0.95.

In order to ensure a safe and reliable operation, the NCP1612ADR2G offers several protection features. The device is protected against over-temperature, overvoltage on the VCC pin and undervoltage conditions. Internal circuitry is also provided to prevent false triggering of protections when working with large sources of output current. The device is protected against short-circuits between the PFC input and output, and between the PFC output and common.

Conclusion

This paper discussed the application field and working principle of NCP1612ADR2G power factor correction controller IC. It is designed for offline SMPS applications requiring continuous conduction mode of operation up to the 400 W output range, which enables designers to build power factor correction circuits for various types of power supplies. The device is based on a slide window technique that regulates a power factor greater than 0.95 and provides design independence from EMI filter requirements, system control schemes and, allowing implementation of a variety of different solutions.

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