UC2854DW集成电路（IC）的PFC（功率因数校正）规格书PDF中文资料

UC2854DW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UC2854DWPFC（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• Control Boost PWM to 0.99 Power Factor

• Limit Line-Current Distortion to < 5

• World-Wide Operation Without Switches

• Feedforward Line Regulation

• Average Current-Mode Control

• Low Noise Sensitivity

• Low Startup Supply Current

• Fixed-Frequency PWM Drive

• Low-Offset Analog Multiplier and Divider

• 1-A Totem-Pole Gate Driver

• Precision Voltage Reference

2 Applications

• Offline AC-to-DC Converters

• Medical, Industrial, Telecom, and IT Power

Supplies

• Uninterruptible Power Supplies (UPS)

• Appliances and White Goods

3 Description

The UC1854 provides active-power factor correction

for power systems that otherwise would draw nonsinusoidal

current from sinusoidal power lines. This

device implements all the control functions necessary

to build a power supply capable of optimally using

available power-line current while minimizing linecurrent

distortion. To do this, the UC1854 contains a

voltage amplifier, an analog multiplier and divider, a

current amplifier, and a fixed-frequency PWM.

In addition, the UC1854 contains a power MOSFETcompatible

gate driver, 7.5-V reference, line

anticipator, load-enable comparator, low-supply

detector, and overcurrent comparator.

The UC1854 uses average current-mode control to

accomplish fixed-frequency current control with

stability and low distortion. Unlike peak current-mode,

average current control accurately maintains

sinusoidal line current without slope compensation

and with minimal response to noise transients.

The high reference voltage and high oscillator

amplitude of the UC1854 minimize noise sensitivity

while fast PWM elements permit chopping

frequencies above 200 kHz. The UC1854 is used in

single-phase and three-phase systems with line

voltages that vary from 75 V to 275 V and line

frequencies across the 50-Hz to 400-Hz range. To

reduce the burden on the circuitry that supplies power

to this device, the UC1854 features low starting

supply current.

These devices are available packaged in 16-pin

plastic and ceramic dual in-line packages, and a

variety of surface-mount packages.