UCC2819A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UCC2819APFC（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)。

FEATURES

Controls Boost Preregulator to Near-Unity

Power Factor

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

10.8-V to 17-V Operation

Programmable Output Voltage (Tracking

Boost Topology)

DESCRIPTION

The UCC2819A/UCC3819A 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 UCC3819A offers new features such as lower

start-up current, lower power dissipation,

overvoltage protection, a shunt UVLO detect

circuitry and a leading-edge modulation technique

to reduce ripple current in the bulk capacitor.

The UCC3819A allows the output voltage to be

programmed by bringing out the error amplifier

noninverting input.