UC2854BDWTRG4

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Mode:	Average Current
Frequency - Switching:	80kHz ~ 120kHz
Current - Startup:	250µA
Voltage - Supply:	10 V ~ 20 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	UC2854B

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UC2854BDWTRG4 Application Field and Working Principle

PMIC - PFC (Power Factor Correction) is the process of improving the power factor of an AC electrical power system by optimizing the current usage in relation to the voltage, connecting the power source with the power supply. This article focuses on the application field and working principle of the UC2854BDWTRG4 PFC device.The UC2854BDWTRG4 device is a pulse-width-modulated current-mode controller. It is ideal for improved Power Factor Correction (PFC) design applications and cost-sensitive designs. The device works by converting a voltage input signal into a pulse width modulated output for controlling power supply and power factor control applications.The UC2854BDWTRG4 is a low-cost current-mode controller suitable for PFC applications. It operates in either continuous-conduction mode (CCM) or critical-conduction mode (CrCM), which extends its application potential. The device includes all of the necessary protection and control features to monitor and protect the power supply system.The UC2854BDWTRG4 is used for a wide range of applications including AC power adapters, portable power tools, energy-saving lamps, consumer electronics, televisions and the like. The device offers fast transient response and excellent line and load regulation to increase power efficiency.In terms of working principle, the UC2854BDWTRG4 uses a voltage sensing technique to apply the correct pulse width modulated (PWM) drive signal to the connected power supply. The device implements an algorithm that calculates the optimum power factor and adjusts both the average current and the frequency of the PWM signal to regulate the DC output voltage.When the AC voltage input is applied to the device, it starts to charge a large capacitor. When the capacitor is fully charged, the device triggers a switching cycle. During a switching cycle, the device\'s power output depends on the peak current and is determined by the PWM signal\'s duty cycle.At the beginning of the cycle, the capacitor is charged to the maximum level and the average current is decreased according to the PWM signal\'s duty cycle. When the capacitor is fully charged and the voltage increases, the average current is gradually increased.When the cycle ends and the average current reaches its peak value, the switching cycle is terminated. The capacitor then starts to discharge and the associated current is also decreased according to the PWM signal\'s duty cycle. Finally, when the capacitor is fully discharged, the switching cycle is forcibly stopped and the process of selecting the next cycle begins.The UC2854BDWTRG4 PFC controller is a cost-effective solution for improved power factor correction and system performance. Its fast transient response and excellent line and load regulation helps improve system efficiency and reduce total system cost. Additionally, the device is protected from over-voltage and over-current conditions and offers reliable protection from common power supply faults.

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