UCC2818DW

Series:	--
Packaging:	Tube
Part Status:	Active
Mode:	Average Current
Frequency - Switching:	6kHz ~ 220kHz
Current - Startup:	150µA
Voltage - Supply:	12 V ~ 17 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:	UCC2818

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UCC2818DW Application Field and Working PrinciplePMIC - PFC (Power Factor Correction) is a critical field of power management integrated circuits (PMICs) and is an important key to achieving energy efficiency in systems and applications. It is also known as active power factor correction (PFC) or active power factor conversion (APFC) because of its ability to dynamically manage and convert power between the line frequency and the AC supply. UCC2818DW is a power factor correction (PFC) control IC designed to achieve high efficiency and performance in switched-mode power supplies. It provides both line-level and AC-level power factor correction, as well as overvoltage and surge protection.The UCC2818DW is a high-performance, cost-effective PFC control IC that integrates power-switching and PFC control features, making it particularly suitable for AC/DC power supplies. It provides a wide range of features and protection mechanisms to ensure system efficiency and reliability, including an adjustable and constant on-time control scheme for both single- and double-ended topologies, plus an AC and line voltage compensation scheme, a low-power-start-up mode, and an overcurrent/overvoltage protection circuit.UCC2818DW utilizes a state-variable-based signal path, allowing it to achieve accurate current-sensing without the need for a transformer. It also provides a wide range of precision control and protection features including over-voltage protection, under-voltage protection, overload protection, over-temperature protection, output capacitance protection, AC bypass protection and ZCD (Zero Cross Detection) immunity.In addition to providing precise power factor correction, the UCC2818DW offers controller functions such as frequency compensation and overvoltage protection. The frequency compensation circuit reduces output capacitor stress by adjusting the peak current detector\'s level based on the input frequency. The overvoltage protection circuit detects an output voltage overshoot, reduces the output voltage and stops the switching, thus preventing the device from being damaged by an excessive output voltage.The UCC2818DW also provides a number of features to further improve system performance and reduce the total cost of ownership such as built-in dynamic load line compensation, input shunt resistor compensation and optimized ripple current detection. The advanced accuracy and control features available in the UCC2818DW make it the ideal choice for high efficiency and active PFC applications. It provides an ideal solution for low-power AC-DC power supplies, SMPs (switched-mode power supplies), and other applications that require active PFC.

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