UCC2818A集成电路（IC）的PFC（功率因数校正）规格书PDF中文资料

UCC2818A属于集成电路（IC）的PFC（功率因数校正）。由德州仪器制造生产的UCC2818APFC（功率因数校正）功率因数校正 (PFC) 是用于调整交流电路中的电压和电流之间的相位角，使之趋近于零的半导体器件。不同模式包括平均电流、边界导通、连续导通、临界导通、电流控制式频率折返、不连续和不连续导通，开关频率从 6 kHz 至 1.7 MHz 可调。

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.