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VOSNS

VCC

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GND

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. ADVANCE INFORMATION for pre-production products; subject to

change without notice.

UCC28056

SLUSD37 – OCTOBER 2017

UCC28056 6-Pin Single-Phase Transition-Mode PFC Controller

1

1 Features

1

•

Transition Mode PFC

–

Good Efficiency

–

Low EMI at High Output Power

•

Unified Algorithm for Working in CrM and DCM

(with high power factor across the entire operating

range)

•

Fast, Enhanced Dynamic Response

•

1.0-A and 0.7-A Drive Capability

•

User Adjustable Valley Switching

•

Industry Best Audibility Performance Over Entire

Load Range

•

Industry Best Light-Load Efficiency with Advanced

Frequency Shaping in DCM and CrM

•

Small Footprint 6-pin SOT-23(6) Package

•

No ZCD Winding for Valley Detection

•

Helps Enable Compliance to IEC61000-3-2

2 Applications

•

Desktop Computing

•

Digital TV SMPS

•

Gaming

•

Set Top Box

•

AC Adapter Front End

•

Electronic Lamp Ballast

•

Entry-Level Server and Web Server

3 Description

UCC28056 is a fully featured PFC controller offering

excellent light load efficiency and standby power.

UCC28056 simplifies the design of power supply

system’s requiring good power factor, that must also

be capable of meeting today's tough standards for

efficiency and standby power. At full load, UCC28056

operates the PFC power stage at maximum switching

frequency in Transition Mode. At reduced load, the

part

transitions

seamlessly

into

Discontinuous

Conduction mode, automatically reducing switching

frequency for maximum efficiency. At light load, DCM

operation is combined with Burst Mode operation to

further improve light load efficiency and standby

power.

UCC28056

integrates

all

the

features

necessary to implement a high performance and

robust PFC stage into a 6-pin package and requires a

minimal number of external components to interface

with the power stage.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

UCC28056

SOT-23(6)

2.90 mm x 1.6 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Simplified Schematic

Standby Power