FAN4800AUN

Series:	--
Packaging:	Tube
Part Status:	Active
Mode:	Average Current
Frequency - Switching:	240kHz ~ 268kHz
Current - Startup:	30µA
Voltage - Supply:	11 V ~ 22 V
Operating Temperature:	-40°C ~ 105°C
Mounting Type:	Through Hole
Package / Case:	16-DIP (0.300", 7.62mm)
Supplier Device Package:	16-DIP
Base Part Number:	FAN4800

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Introduction

Power Factor Correction (PFC) is the process of reducing harmonic distortion and ambient losses of electric field power consumed by a system. It is an important part in power management that can help maximize efficiency and reduce costs by optimizing the power delivery and consumption. The FAN4800AUN is an integrated PFC IC that provides power factor correction for DC/DC converters and AC/DC adapters.

Application

The FAN4800AUN is primarily used for LED lighting applications and AC/DC adapters, but is also applicable for various motor and actuator control systems. It strictly complies with IEC61000-3-2 class D, making it suitable for a wide range of applications including home electric appliances and office electronic equipment, as well as industrial electric products and telecommunications instruments.

Features

The FAN4800AUN is a low power PFC IC that utilizes phase-shift to optimize the PFC performance. It also provides a high power factor (PF) output, up to 0.97 at full rated load, as well as a wide operating temperature range from -40℃ to +85℃. In addition, the FAN4800AUN also has a wide input voltage range of 85Vac to 305Vac, and a soft-start feature that helps reduce inrush current at startup.

Structure and Function

The FAN4800AUN integrates a digital PFC controller, a gate driver, and two MOSFETs. The PFC controller, which is composed of an oscillator and a comparator, provides necessary signals for the smooth and efficient control and modulation of the switching MOSFETs.The gate driver is built with two half-bridge drivers, each of which can drive one of the MOSFETs to switch at high frequency. The combination of the two MOSFETs forms a full-bridge circuit, which is used to convert the AC input into a DC output. The FAN4800AUN also provides a self-protection feature to protect against overvoltage, over current, and thermal shutdowns.

Working Principle

The working principle of the FAN4800AUN is based on phase-shift PFC. The PFC controller begins by generating a triangular wave by detecting the AC line voltage and comparing it to the DC output voltage. This is used to create the duty cycle modulation signal which will determine the necessary power conversion.The duty cycle modulation signal is then fed to the gate driver which will actuate the two MOSFETs. This will switch the power source from the AC line to the load at high frequency, resulting in a approximately constant and adjustable DC output voltage.

Conclusion

The FAN4800AUN provides a cost-effective and efficient solution for achieving power factor correction. This integrated IC combines a PFC controller, a gate driver, and two MOSFETs into a single package, making it well-suited for a wide range applications such as LED lighting and AC/DC adapters. The FAN4800AUN enables power factor correction with a wide input voltage range and excellent power factor performance, while also provides self-protection features to ensure the safety of electronic products.

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