UC2854AL

更新时间： 2024-11-22 23:38:55

品牌	Logo	应用领域
德州仪器 - TI		模拟IC
页数	文件大小	规格书
7页	190K
描述
Analog IC

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中文翻译

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数据手册

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UC2854AL 数据手册

UC1854A/B

UC2854A/B

UC3854A/B

Enhanced High Power Factor Preregulator

FEATURES

DESCRIPTION

•

Controls Boost PWM to Near Unity

The UC1854A/B products are pin compatible enhanced versions of the

UC1854. Like the UC1854, these products provide all of 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 the AC input line voltage. To do this

the UC1854A/B uses average current mode control. Average current

mode control maintains stable, low distortion sinusoidal line current

Power Factor

•

Limits Line Current Distortion To <3%

World-Wide Operation Without Switches

Accurate Power Limiting

Fixed Frequency Average Current Mode without the need for slope compensation, unlike peak current mode

Control

control.

•

High Bandwidth (5MHz), Low Offset

Current Amplifier

The UC1854A/B products improve upon the UC1854 by offering a wide

bandwidth, low offset Current Amplifier, a faster responding and

improved accuracy enable comparator, a VREF "good" comparator,

UVLO threshold options (16/10V for offline, 10.5/10V for startup from

an auxiliary 12V regulator), lower startup supply current, and an

enhanced multiply/divide circuit. New features like the amplifier output

clamps, improved amplifier current sinking capability, and low offset

VAC pin reduce the external component count while improving

performance. Improved common mode input range of the Multiplier

output/Current Amp input allow the designer greater flexibility in

choosing a method for current sensing. Unlike its predecessor, RSET

controls only oscillator charging current and has no effect on clamping

the maximum multiplier output current. This current is now clamped to

Integrated Current and Voltage Amp

Output Clamps

Multiplier Improvements: Linearity,

500mV VAC Offset (eliminates external

resistor), 0-5V Multout Common Mode

Range

•

VREF "GOOD" Comparator

Faster and Improved Accuracy ENABLE

Comparator

a maximum of 2 IAC at all times which simplifies the design process

and provides foldback power limiting during brownout and extreme low

line conditions.

•

UVLO Threshold Options

(16/10V / 10.5/10V)

300µA Startup Supply Current

A 1% 7.5V reference, fixed frequency oscillator, PWM, Voltage

Amplifier with softstart, line voltage feedforward (VRMS squarer), input

supply voltage clamp, and over current comparator round out the list of

features.

UVLO Turn on UVLO Turn off

UC1854A

UC1854B

16V

10V

10.5V

BLOCK DIAGRAM

UDG-93001-1

6/98

12 3 4 5 6 7

中文翻译

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与UC2854AL相关器件

型号	品牌	获取价格	描述	数据表
UC2854AN	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC2854ANG4	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC2854AQ	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC2854AQTR	TI	获取价格	Power Factor Controller
UC2854B	TI	获取价格	Enhanced High Power Factor Preregulator
UC2854BDW	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC2854BDWG4	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC2854BDWTR	TI	获取价格	Power Factor Controller
UC2854BDWTRG4	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC2854B-EP	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR

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