UCC28050 Datasheet

IC型號(hào)：
UCC28050
PDF描述：
Transition Mode PFC Controller
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PDF頁數(shù)：
24頁
芯片廠家：
ETC

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UCC28050, UCC28051

UCC38050, UCC38051

SLUS515B鈥揝EPTEMBER 2002 鈥?REVISED JUNE 2003

TRANSITION MODE PFC CONTROLLER

FEATURES

Transition Mode PFC Controller for Low

Implementation Cost

Industry Pin Compatibility With Improved

Feature Set

Improved Transient Response With

Slew-Rate Comparator

Zero Power Detect to Prevent OVP During

Light Load Conditions

Accurate Internal V

REF

for Tight Output

Regulation

Two UVLO Options

Overvoltage Protection (OVP),

Open-Feedback Protection and Enable

Circuits

鹵

750-mA Peak Gate Drive Current

Low Start-Up and Operating Currents

APPLICATIONS

Switch-Mode Power Supplies for Desktops,

Monitors, TVs and Set Top Boxes (STBs)

AC Adapter Front-End Power Supplies

Electronic Ballasts

DESCRIPTION

The UCC38050 and UCC38051 are PFC

controllers for low-to-medium power applications

requiring compliance with IEC 1000-3-2 harmonic

reduction standard. It is designed for controlling a

boost preregulator operating in transition mode

(also referred to as boundary conduction mode or

critical conduction mode operation). It features a

transconductance voltage amplifier for feedback

error processing, a simple multiplier for

generating a current command proportional to the

input

voltage,

current-sense

(PWM)

comparator, PWM logic and a totem-pole driver

for driving an external FET.

SIMPLIFIED APPLICATION DIAGRAM

UCC38050

VO_SNS VCC

COMP

DRV

GND

ZCD

MULTIN

UDG鈥?2125

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

錚?/div>

2002, Texas Instruments Incorporated

www.ti.com

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