NCP1608B PFC Controller

Updated: 2026-07-21

Overview

The NCP1608B is a power factor correction (PFC) controller IC developed by ON Semiconductor. It is designed to improve energy efficiency in AC-DC power supply systems by ensuring the input current waveform aligns with the voltage waveform. This reduces harmonic distortion and enhances power quality. The IC is widely used in applications such as LED drivers, industrial power supplies, and consumer electronics. Its compact design and advanced features make it a preferred choice for engineers aiming to meet stringent energy efficiency standards like ENERGY STAR and 80 PLUS.

Structure and Working Principle

The NCP1608B integrates a critical conduction mode (CrM) PFC controller, which operates at the boundary between continuous and discontinuous conduction modes. This allows for high efficiency across a wide load range. The IC includes an internal startup timer, over-voltage protection, and inrush current limiting. Its working principle involves modulating the duty cycle of the power switch to shape the input current waveform. This ensures the power factor is close to unity, minimizing reactive power and improving overall system efficiency. The IC also features a low quiescent current, making it suitable for standby power applications.

Key Features

The NCP1608B boasts several key features, including a wide input voltage range (85 VAC to 265 VAC), low total harmonic distortion (THD), and high power factor (PF > 0.9). It also offers protections against over-voltage, under-voltage, and over-temperature conditions. Another notable feature is its ability to operate in both fixed-frequency and variable-frequency modes, providing flexibility in design. The IC's low standby power consumption (< 30 mW) makes it ideal for energy-efficient applications, aligning with global energy-saving regulations.

Application Areas

The NCP1608B is commonly used in power supplies for LED lighting, televisions, monitors, and other consumer electronics. Its high efficiency and reliability also make it suitable for industrial applications such as server power supplies and telecom equipment. In addition, the IC is employed in renewable energy systems, including solar inverters, where power factor correction is critical for grid compatibility. Its robust design ensures stable performance even in harsh environments.

Maintenance and Precautions

To ensure optimal performance, the NCP1608B should be used within its specified electrical and thermal limits. Proper heat sinking is recommended for high-power applications to prevent overheating. Designers should also adhere to the layout guidelines provided in the datasheet to minimize noise and EMI. Avoid exposing the IC to moisture or excessive mechanical stress. Regular testing and validation of the PFC circuit are advised to maintain long-term reliability. In case of failure, replace the IC with a genuine part to avoid compatibility issues.

B2B Procurement Guide

When procuring the NCP1608B in bulk, buyers should verify the supplier's authenticity to avoid counterfeit components. ON Semiconductor's authorized distributors are the most reliable sources. Pricing varies based on order volume, with discounts available for large quantities. Lead times can range from 4 to 12 weeks, depending on market demand. Buyers should plan accordingly and consider alternative PFC controllers if urgent delivery is required. Request samples for testing before committing to large orders to ensure compatibility with the target application.