UC1852 Datasheet High Power-Factor Preregulator

Manufacturer: UNITRODE

Overview: High Power-Factor Preregulator UC1852 UC2852 UC3852.

UC1852 high power-factor preregulator by UNITRODE - Datasheet Preview

Datasheet Details

Part number	UC1852
Manufacturer	UNITRODE
File Size	400.02 KB
Description	High Power-Factor Preregulator
Download	UC1852 Download (PDF)

General Description

The UC1852 provides a low-cost solution to active power-factor correction (PFC) for systems that would otherwise draw high peak current pulses from AC power lines.

This circuit implements zero-current switched boost conversion, producing sinusoidal input currents with a minimum of external components, while keeping peak current substantially below that of fully-discontinuous converters.

The UC1852 provides controlled switch on-time to regulate the output bulk DC voltage, an off-time defined by the boost inductor, and a zero-current sensing circuit to reactivate the switch cycle.

Key Features

Low-Cost Power Factor Correction.
Power Factor Greater Than 0.99.
Few External Parts Required.
Controlled On-Time Boost PWM.
Zero-Current Switching.
Limited Peak Current.
Min and Max Frequency Limits.
Starting Current Less Than 1mA.
High-Current FET Drive Output.
Under-Voltage Lockout.

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