UCC3818DTRG4

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The UCC3818 is a type of power factor correction (PFC) integrated circuit, most commonly found in switch mode power supplies (SMPS) used to improve the power factor by preventing electrical power surges and protecting sensitive equipment from physical damage or incorrect operation. It can also be used as an active harmonic filter to reduce or eliminate harmonic voltage distortions. Since the UCC3818 is specifically designed for power factor correction, it provides excellent linearity, high efficiency, and improved power factor independent of load.

The UCC3818 employs dual Pulse Width Modulated (PWM) drivers and a high-voltage totem pole output stage to control switch mode power conversion in various types of high-performance power supplies. It is capable of providing a regulated output voltage over a wide input voltage range and is designed for high-input voltage operation, making it ideal for use in applications requiring large step-up voltages. It also features an adjustable soft-start function to provide protection against overload at startup, and an output current limit function to provide protection against excessive load current.

The UCC3818 is typically used in switch-mode power supplies that are used in industrial, automotive, and telecommunications applications such as mobile phones, laptop computers, and PDAs. With its high efficiency and excellent power factor, it is perfect for applications that require low power dissipation and noise levels of operation. It can also be used in general purpose power supplies, LED drivers, motor control, and LED lighting applications.

The UCC3818 utilizes a voltage loop which is composed of a reference voltage, an error amplifier, and a voltage comparator, to compare the actual output voltage and the reference voltage to maintain a constant output voltage. In addition, an internal current limiting circuit and an overvoltage protection circuit are included to provide protection from overloads and excessive voltage. The UCC3818 also features an adjustable soft-start circuit that allows the power supply output to ramp up slowly to reduce inrush current and to prevent possible power supply damage.

The UCC3818 achieves superior power factor performance by operating the primary side switch at a fixed frequency and duty cycle, rather than the usual variable frequency, thus avoiding the problems of harmonics and power losses associated with variable-frequency regulation. The wide pulse-width-modulated frequency range also allows the UCC3818 to maintain a high output power factor under wide load variations, eliminating the need for extra power factor correction circuitry.

Overall, the UCC3818 is a highly efficient and reliable PFC integrated circuit that is perfect for use in high-performance switch mode power supplies. With its excellent power factor, low power dissipation, and adjustable soft-start functions, it is ideal for applications requiring fewer board components, greater user versatility, and improved system efficiency. The UCC3818’s superior performance and features make it a popular choice among power engineers, allowing them to achieve more efficient, reliable, and cost-effective power supply designs.

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