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High Power-Factor Preregulator
UC1852 UC2852 UC3852
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
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.
UC1852 Datasheet
