UC3852

series introduction

# Introduction to the UC3852 Product Series

## 1. Overview
The UC3852 product series is a highly regarded and versatile line of integrated circuits (ICs) specifically designed for power factor correction (PFC) applications. Power factor correction is a crucial aspect in modern electrical systems as it helps to improve the efficiency of power utilization, reduce energy losses, and comply with various power quality standards. The UC3852 series offers a comprehensive solution for designers looking to implement PFC in a wide range of power supplies, from small consumer electronics to large industrial equipment.

## 2. Key Features

### 2.1 High - Performance PFC Control
- **Precise Power Factor Correction**: The UC3852 is capable of achieving a high power factor, typically close to unity (PF ≈ 1). This means that it can effectively convert the input AC power into DC power with minimal reactive power, resulting in more efficient use of electrical energy.
- **Low Total Harmonic Distortion (THD)**: It significantly reduces the harmonic content in the input current. Low THD is essential as it helps to prevent interference with other electrical equipment connected to the same power grid and ensures compliance with international standards such as IEC 61000 - 3 - 2.

### 2.2 Adaptive Control Algorithms
- **Average Current - Mode Control**: The series employs average current - mode control techniques. This method provides excellent line and load regulation, ensuring stable operation under varying input voltage and load conditions. It also allows for better control of the inductor current, which is crucial for achieving accurate power factor correction.
- **Adaptive Line Feed - Forward**: The UC3852 incorporates an adaptive line feed - forward feature. This enables the circuit to quickly respond to changes in the input line voltage, adjusting the control parameters accordingly to maintain a high power factor and stable output voltage.

### 2.3 Protection Features
- **Over - Current Protection (OCP)**: To safeguard the power supply and connected components, the UC3852 is equipped with over - current protection. In the event of an excessive current flow, the circuit will automatically shut down or limit the current to prevent damage.
- **Over - Voltage Protection (OVP)**: It also includes over - voltage protection. If the output voltage exceeds a predefined safe level, the IC will take appropriate action to protect the system, such as reducing the power output or shutting down the converter.

### 2.4 Ease of Use
- **Simple External Component Requirements**: The UC3852 series requires a relatively small number of external components for operation. This simplifies the circuit design process, reduces the overall cost of the power supply, and saves printed circuit board (PCB) space.
- **Flexible Configuration**: Designers can easily configure the UC3852 for different input and output voltage levels, power ratings, and operating frequencies. This flexibility makes it suitable for a wide variety of applications.

## 3. Applications

### 3.1 Consumer Electronics
- **LCD and LED TVs**: In modern flat - panel televisions, power factor correction is essential to meet energy efficiency requirements and reduce power consumption. The UC3852 can be used in the power supply units of these TVs to improve the power factor and ensure stable operation.
- **Personal Computers**: Desktop and laptop power supplies can benefit from the UC3852's power factor correction capabilities. By reducing the reactive power and harmonic distortion, it helps to improve the overall efficiency of the computer's power consumption and reduces the stress on the electrical grid.

### 3.2 Industrial Equipment
- **Motor Drives**: Industrial motor drives often require high - power and efficient power supplies. The UC3852 can be integrated into these drives to improve the power factor, reduce

Images for reference

8-SOIC

8-DIP

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Datasheets

• UC1852, 2852, 3852
• PDF 2
• PDF 3

Partlist