FAN4803CS2X Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Mode:	Average Current
Frequency - Switching:	67kHz
Current - Startup:	200µA
Voltage - Supply:	10 V ~ 15 V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	FAN4803

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Introduction

Power Factor Correction (PFC) is an important branch of Power Management and Integrated Circuits (PMICs) which plays a crucial role in regulating the electrical power utilized by industry and consumer applications. The FAN4803CS2X is a major PMIC-PFC product supplied by Fairchild Semiconductor which is designed to improve the performance and efficiency of power conversion systems. This article provides an overview of the application field and working principle of FAN4803CS2X.

FAN4803CS2X Application Field

The FAN4803CS2X is an integrated PFC controller suitable for Smart Phone charger and adapter. It integrates the entire PFC circuits and performs the Universal Serial Bus (USB) Type-C compliant operation for Smart Phone charging. The PFC controller provides an accuracy voltage feedback and current sensing without complicated external current-sensing circuitry. The system integration makes the FAN4803CS2X an ideal solution for many Smart Phone charging applications. The FAN4803CS2X is a perfect choice for high power applications such as LED lighting and medical power applications.It provides high power efficiency and accuracy, while ensuring the product meets EMC requirements.The FAN4803CS2X employs crest factor control (CFC) to achieve the desired high power factor, high conversion efficiency, and low output voltage ripple.

Working Principle

The FAN4803CS2X is based on a synchronous rectification topology consisting of a half bridge topology with a high voltage start-up block, a control block and a power stage. The main function of the high voltage start-up block is to provide the voltage to enable the power stage. In this block, a low voltage start-up circuit is used to receive an input voltage in order to detect the presence of an input voltage.Once the presence of a valid input voltage is detected, the VIN pin is turned on and the other components of the high voltage start-up block are enabled. When the input voltage exceeds the pre-set level, it will be discharged to the gate driver then to the power stage.The control block includes an oscillator, a ripple control loop and an average current control loop.The oscillator generates the timing information which is used to control the power stage.The two loops are responsible to accurately monitor the operation of the power stage and adjust the switching frequency, thus controlling the output current and voltage. The average current control loop provides the average current regulation to minimize the total harmonic distortion (THD) and the ripple control loop suppresses the PFC output voltage ripple.The power stage consists of an ultra-low dropout (ULDO) switching regulator and a low side driver, which control the two switches of the half-bridge topology. The ULDO switching regulator ensures that the desired MOSFET switch transitions can be made without significant power loss. The low side driver is responsible for driving the power element with a specific pulse width for the load current.

Conclusion

The FAN4803CS2X is a highly integrated PMIC-PFC that operates in a variety of Smart Phone and high power applications. It includes a high voltage start-up block, a control block and a power stage to provide the desired output. The oscillator, the ripple control loop and the average current control jointly ensure that the power stage is accurately monitored and adjusted. The ULDO switching regulator and the low side driver are used to control the two switches of the half-bridge topology in order to efficiently deliver the desired output.

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