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UCC38051 Datasheet Preview

UCC38051 Datasheet

Transition Mode PFC Controller

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UCC28050, UCC28051, UCC38050, UCC38051
SLUS515G – SEPTEMBER 2002 – REVISED DECEMBER 2015
UCC2805x, UCC3805x Transition Mode PFC Controller
1 Features
1 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 Overvoltage
Protection (OVP) During Light Load Conditions
• Accurate Internal VREF for Tight Output
Regulation
• Two UVLO Options
• OVP, Open-Feedback Protection, and Enable
Circuits
• ±750-mA Peak Gate Drive Current
• Low Start-Up and Operating Currents
• Lead (Pb)-Free Packages
3 Description
The UCC38050 and UCC38051 are PFC controllers
for low-to-medium power applications requiring
compliance with IEC 1000-3-2 harmonic reduction
standard. The controllers are designed for a boost
preregulator operating in transition mode (also
referred to as boundary-conduction mode or critical
conduction-mode operation). They feature a
transconductance voltage amplifier for feedback error
processing, a simple multiplier for generating a
current command proportional to the input voltage, a
current-sense (PWM) comparator, PWM logic, and a
totem-pole driver for driving an external FET.
In the transition mode operation, the PWM circuit is
self-oscillating, with the turnon being governed by an
inductor zero-current detector (ZCD pin), and the
turnoff being governed by the current-sense
comparator. Additionally, the controller provides
features such as peak current limit, default timer,
overvoltage protection (OVP) and enable.
2 Applications
• Single-Stage PFC Flyback Converters for Lighting
and Motor Drives
• Switch-Mode Power Supplies for Desktops,
Monitors, TVs, and Set Top Boxes (STBs)
• AC Adapter Front-End Power Supplies
• Electronic Ballasts
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC28050,
UCC28051,
UCC38050,
UCC38051
SOIC (8)
PDIP (8)
3.91 mm × 4.90 mm
6.35 mm × 9.81 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Diagram
UCC38050
1 VO_SNS VCC 8
2 COMP
DRV 7
3 MULTIN
GND 6
4 CS
ZCD 5
UDG−02125
1
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. PRODUCTION DATA.




etcTI

UCC38051 Datasheet Preview

UCC38051 Datasheet

Transition Mode PFC Controller

No Preview Available !

UCC28050, UCC28051, UCC38050, UCC38051
SLUS515G – SEPTEMBER 2002 – REVISED DECEMBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 11
7.3 Feature Description................................................. 12
7.4 Device Functional Modes........................................ 14
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application ................................................. 16
9 Power Supply Recommendations...................... 21
10 Layout................................................................... 22
10.1 Layout Guidelines ................................................. 22
10.2 Layout Example .................................................... 22
11 Device and Documentation Support ................. 23
11.1 Device Support...................................................... 23
11.2 Related Links ........................................................ 23
11.3 Community Resources.......................................... 23
11.4 Trademarks ........................................................... 23
11.5 Electrostatic Discharge Caution ............................ 23
11.6 Glossary ................................................................ 23
12 Mechanical, Packaging, and Orderable
Information ........................................................... 24
4 Revision History
Changes from Revision F (March 2009) to Revision G
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................ 1
2 Submit Documentation Feedback
Copyright © 2002–2015, Texas Instruments Incorporated
Product Folder Links: UCC28050 UCC28051 UCC38050 UCC38051


Part Number UCC38051
Description Transition Mode PFC Controller
Maker etcTI
Total Page 30 Pages
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