FAN4822IN

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Introduction

FAN4822IN is a continuous constant-current (CC) peak current move current-mode PFC controller that is designed to improve the power factor of AC-DC converters. It features advanced CCM operation and programmable peak current source stage along with excellent current-mode control. It can reduce the high-frequency ripple current and its associated losses, thus improving system efficiency.

Application Field of FAN4822IN

In terms of application fields, FAN4822IN is suitable for universal AC input power supplies with power factors over 0.9 and half-bridge resonant converters. It can be used in LED lighting, UPS, PFC pre-regulators, high-performance AC-DC adapters, ballast, high-power battery charger, active power filter, server power, and other industrial power supplies.

Working Principle of FAN4822IN

The FAN4822IN works according to PFC (Power Factor Correction) principle. It uses an active control circuit to regulate the input current waveform so that it follows the input voltage waveform. In GCM (or CCM) mode, the current feed-forward gain of the control loop is greater than the voltage feed-forward gain, allowing the converter to maintain a high power factor and less current distortion, even under light loads. The PFC controller is responsible for providing the constant current loop with a current reference as well as sensing and comparing the actual input current with the reference. The controller output is a pulse current signal which is ultimately used to control the switching devices.

The FAN4822IN operates in regulated continuous conduction mode of operation (CCM) with technical features including:

• Gate drive current up to 600mA
• Programmable and constant peak current range down to 0.1mA
• Programmable operating frequency from 20-65 kHz
• Programmable line under-voltage lockout and soft-start
• Programmable burst-mode operation

Conclusion

FAN4822IN is an advanced PFC controller with good regulation characteristics and high power factor. It is suitable for various kinds of AC-DC power supplies, ranging from LED lighting to battery chargers and power filters. Its continuous conduction mode (CCM) of operation allows it to maintain a high power factor, while its programmable features give users the flexibility to customize their converter designs. With its excellent performance and wide range of applications, FAN4822IN is an ideal PFC controller for AC-DC power supplies.

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