UCC2817 - Texas Instruments

UCC2817 BiCMOS Power Factor Pregulator

The UCCx817 and UCCx818 family provides all the functions necessary for active power factor-corrected preregulators. The controller achieves near-unity power factor by shaping the AC input line current waveform to correspond to that of the AC input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current. Designed i.

Features

•1 Controls Boost Preregulator to Near-Unity Power Factor
• Limits Line Distortion
• World Wide Line Operation
• Over-Voltage Protection
• Accurate Power Limiting
• Average Current Mode Control
• Improved Noise Immunity
• Improved Feed-Forward Line Regulation
• Leading Edge Modulation
• 150-μA Typical Start-Up Current
• Low-Power BiCMOS Operation
• Up to 18-V Operation
• Frequency Range 6 kHz to 220 kHz 2 Applications
• PC Power
• Consumer Electronics
• Lighting
• Industrial Power Supplies
• IEC6100-3-2 Compliant Supplies Less Than 300 W 3 Description The UCCx817 and UCCx818 family provides a.