DESCRIPTION

· The UCCx817 and UCCx818 family provides all necessary functions for active power factor-corrected preregulators.
· Achieves near-unity power factor by shaping AC input line current waveform to correspond with AC input line voltage.
· Features average current mode control for stable, low distortion sinusoidal line current.
· Designed in Texas Instrument's BiCMOS process with features like lower start-up current, lower power dissipation, overvoltage protection, and improved current amplifier.

FEATURES

· Controls Boost Preregulator to Near-Unity Power Factor.
· Limits Line Distortion and operates worldwide.
· Includes Over-Voltage Protection and Accurate Power Limiting.
· Features Average Current Mode Control and Improved Noise Immunity.
· Leading Edge Modulation and Low-Power BiCMOS Operation.
· Operates up to 18-V with a frequency range of 6kHz to 220kHz.

APPLICATIONS

· PC Power and Consumer Electronics.
· Lighting and Industrial Power Supplies.
· IEC6100-3-2 Compliant Supplies Less Than 300W.