FAN4801NY

Series:	--
Packaging:	Tube
Part Status:	Not For New Designs
Mode:	Average Current
Frequency - Switching:	64kHz
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:	FAN4801

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Power Factor Correction (PFC) is a technique used to reduce the energy losses associated with electrical power distribution. It involves the modification of power distribution to reduce power outages, limit noise, and improve the overall efficiency of electrical systems. The application field of the FAN4801NY, a DC/DC power factor correction controller, is to assure that it provides reliable, low-cost and highly efficient power factor correction and power conversion.The design principles behind PFC are based on the theoretical current and voltage phasors of a normal AC signal. When two phasors with the same frequency and amplitude collide, significant losses occur due to their imbalance. A power factor corrected signal requires that the current and voltage phasors have the same amplitudes and the same frequency, so that no losses occur. Traditionally, PFC was achieved by using DC-link capacitors, but FAN4801NY uses a more efficient Inductor-Capacitor (LC) filter.The FAN4801NY IC is designed to operate in the constant-power single-switch Power Factor Correction (PFC) topologies. It integrates several building blocks, including a peak-current-mode variable-frequency-adjustable high-side switch, low-side switch, DC to DC converter, PFC Pre-regulator, and PDM (pulse density modulation) Pulse Width Modulation (PWM).When in operation, the FAN4801NY works by modulating the power switch duty cycle to achieve a sinusoidal current wave with a positive phase shift. Through the use of PDM PWM, it adjusts the voltage and current output to maintain a constant power factor with a peak power factor. The FAN4801NY also features a high-current internal watchdog (HICWD) featuring an active short detection and open-load detection circuits to maintain the desired power conversion performance.The PFC pre-regulator within the FAN4801NY provides a fixed-frequency link regulating the input power supply through controlling the duty cycle of the high-side switch. This control results in the sinusoidal input current, which ensures power factor correction.The FAN4801NY IC also features a low-power-switching (LPWS) mode for improving performance under light loads. The switching frequency adaptive algorithm of the low-power-switching (LPWS) mode increases or decrease the switching frequency of the IC to match the maximum available power supply voltage.In summary, the FAN4801NY is a highly efficient, low-cost power factor correction controller. It promotes efficient power conversion and correction by removing losses associated with DC-link capacitors, as well as providing a low-power-switching mode for reducing energy consumption. The device is especially well suited for high-voltage, low-power applications, such as notebooks, tablets, phones, and other consumer electronics.

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