Datasheet > UC2853A_16

UC2853A_16

更新时间： 2024-11-05 02:58:51

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
10页	411K
描述
High Power Factor Preregulator

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UC2853A_16 数据手册

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INFO

UC2853A

available

High Power Factor Preregulator

DESCRIPTION

FEATURES

•

Complete 8-pin Power Factor

Solution

The UC2853A provides simple, yet high performance active power factor

correction. Using the same control technique as the UC1854, this 8-pin de-

vice exploits a simplified architecture and an internal oscillator to minimize

external component count. The UC2853A incorporates a precision multi-

plier/squarer/divider circuit, voltage and current loop error amplifiers, and a

precision voltage reference to implement average current mode control

with RMS line voltage compensation. This control technique maintains con-

stant loop gain with changes in input voltage, which minimizes input line

current distortion over the worldwide input voltage range.

•

Reduced External Components

RMS Line Voltage Compensation

Precision Multiplier/Squarer/Divider

Internal 63kHz Synchronizable

Oscillator

The internal 63kHz oscillator includes an external clock input, allowing syn-

chronization to downstream converters. Additionally, the device features an

overvoltage protection comparator, a clamped MOSFET gate driver which

self-biases low during undervoltage lockout, and low startup and supply

•

Average Current Mode PWM

Control

•

Overvoltage Protection Comparator

High Current, Clamped Gate Driver current.

The UC2853A is identical to the UC2853 except the internal oscillator fre-

quency has been reduced from 75kHz to 63kHz. The switching frequency

is lowered in order to keep the second harmonic of the switching frequency

below a 150kHz. For EMI specifications at 150kHz this makes it easier for

a design to meet system requirements.

These devices are available in 8-pin PDIP (P) and SOIC (D) packages. The

UC2853A is specified for operation from –40°C to 105°C.

BLOCK DIAGRAM

UDG-94120-1

SLUS650A - FEBRUARY 2005 - REVISED JANUARY 2006

12 3 4 5 6 7...10

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