UC3853N

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UC3853N is a high performance voltage mode Pulse Width Modulation (PWM) controller. It belongs to the class of PMIC - PFC (Power Factor Correction) controllers used for lighting and other power factor correction applications. It has a wide operating voltage range of up to 200V, so it can be easily integrated into variable power supply systems.

The main application field of the UC3853N are AC to DC converter systems with power factor corrected output and light dimmers. The device is also used in switch mode power supplies, which require high-current power factor corrected outputs, such as in LCD TVs, LED and fluorescent lighting and notebooks adapters.

The main working principle of the UC3853N is to adjust the modulation of the width of the pulse, which is applied to the AC load. This ensures that the voltage and current applied to the load are always in phase with each other. In this way, the efficiency of the power supply is improved and the influence of the reactive power is minimized.

The UC3853N has wide range of features to optimize the power factor correction performance. It includes an internal multiplier for adjusting the gain of the input voltage, which is used to dynamically compensate for the line and load regulation. Additionally, the device has built in frequency compensation which eliminates the need for external compensation components, so minimizing the system\'s cost and size.

The UC3853N also has diagnostic and over current protection features, providing comprehensive protection against all kinds of overloads, such as short circuits and reversed wiring. The device uses an external MOSFET to switch the load, allowing it to operate at high frequencies with minimal conduction losses.

The UC3853N is suitable for a wide range of AC dimmers and power factor corrected power supplies, making it a popular choice for applications requiring high efficiency, compact design and high reliability. Its wide operating voltage range and a range of features make it an ideal solution for a variety of applications.

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