UC3854 High Power Factor Preregulator IC

UC3854 High Power Factor Preregulator IC

The UC3854 High Power Factor Preregulator IC is an integrated solution designed to improve the efficiency and performance of power supplies by achieving a high power factor (PF). It is primarily used in applications requiring a reliable AC-to-DC conversion with minimized harmonic distortion and improved energy efficiency. This IC is typically used in power supplies for computers, telecommunication equipment, and industrial control systems. The UC3854 uses a pre-regulation technique to maintain a stable output voltage while regulating the input current in such a way that it draws power in phase with the input AC voltage, resulting in a power factor close to unity (typically >0.9). This helps reduce losses, minimize ripple, and optimize the overall performance of the power supply. One of the key features of the UC3854 is its internal control circuitry, which includes feedback regulation, overcurrent protection, and under-voltage lockout, ensuring safe and efficient operation. The IC also provides soft start functionality, preventing inrush current during power-up, and features pulse-width modulation (PWM) control for high efficiency.

Features:-

• High-Speed Operation
• Wide Operating Voltage Range 
• Low Power Consumption
• Low Noise Sensitivity
• Low Startup Supply Current
• Fixed-Frequency PWM Drive
• Low-Offset Analog Multiplier and Divider