UCC3818AD屬于集成電路（IC）的PFC（功率因數(shù)校正）。由美國德州儀器公司制造生產(chǎn)的UCC3818ADPFC（功率因數(shù)校正）功率因數(shù)校正 (PFC) 是用于調(diào)整交流電路中的電壓和電流之間的相位角，使之趨近于零的半導(dǎo)體器件。不同模式包括平均電流、邊界導(dǎo)通、連續(xù)導(dǎo)通、臨界導(dǎo)通、電流控制式頻率折返、不連續(xù)和不連續(xù)導(dǎo)通，開關(guān)頻率從 6 kHz 至 1.7 MHz 可調(diào)。

1 Features

1? Controls Boost Preregulator to Near-Unity Power

Factor

? Limits Line Distortion

? World Wide Line Operation

? Overvoltage 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

? 12-V to 17-V Operation

? Frequency Range of 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 UCC3817A and the UCC3818A 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 in Texas Instrument's BiCMOS process, the

UCC3817A/UCC3818A offers new features such as

lower start-up current, lower power dissipation,

overvoltage protection, a shunt UVLO detect circuitry,

a leading-edge modulation technique to reduce ripple

current in the bulk capacitor and an improved, lowoffset

(±2 mV) current amplifier to reduce distortion at

light load conditions.