Datasheet > UC3854

UC3854

更新时间： 2024-11-03 14:55:43

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
6页	304K
描述
enhanced high power factor preregulator

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UC3854 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UC3854

Advance

CMOS IC

ENHANCED HIGH POWER

FACTOR PREREGULATOR



DESCRIPTION

The UTC UC3854 provide 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 AC input line voltage. Average current mode

control maintains stable, low distortion sinusoidal line current

without the need for slope compensation, unlike peak current mode

control.

SOP-16

Designed in UTC’s Bipolar process, the UTC UC3854 offers

new features such as wide bandwidth, low offset Current Amplifier,

a faster responding and improved accuracy enable comparator, a

V_REF"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 improved amplifier current sinking capability,

amplifier output clamps, 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, the maximum multiplier output

current is now clamped to a maximum of 2 * I_ACat all times.

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

Amplifier with softstart, line voltage feedforward (V_RMSsquarer),

input supply voltage clamp, and over current comparator round out

the list of features.



FEATURES

* Controls Boost Preregulator to Near Unity Power Factor

* Limits Line Distortion

* World-Wide Line Operation

* Accurate Power Limiting

* Fixed Frequency Average Current Mode Control

* High Bandwidth (5MHz), Low Offset Current Amplifier

* 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

* 300uA Startup Supply Current

www.unisonic.com.tw

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与UC3854相关器件

型号	品牌	获取价格	描述	数据表
UC3854A	TI	获取价格	Enhanced High Power Factor Preregulator
UC3854A/B	TI	获取价格	ADVANCED PFC/PWW COMBINATION CONTROLLER WITH TRAILING-EDGE/TRAILING-EDGE MODULATION
UC3854ADW	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC3854ADWG4	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC3854ADWTR	TI	获取价格	Power Factor Controller
UC3854ADWTRG4	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC3854AJ	TI	获取价格	Analog IC
UC3854AL	TI	获取价格	Analog IC
UC3854AN	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR
UC3854ANG4	TI	获取价格	ADVANCED HIGH-POWER FACTOR PREREGULATOR