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UCC28056

SLUSD37E – OCTOBER 2017 – REVISED NOVEMBER 2019

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Copyright © 2017–2019, Texas Instruments Incorporated

Table of Contents

1

Features .................................................................. 1

2

Applications ........................................................... 1

3

Description ............................................................. 1

4

Revision History..................................................... 2

5

Device Comparison Tables................................... 4

6

Pin Configuration and Functions ......................... 5

7

Specifications......................................................... 6

7.1

Absolute Maximum Ratings ...................................... 6

7.2

ESD Ratings.............................................................. 6

7.3

Recommended Operating Conditions ....................... 6

7.4

Thermal Information .................................................. 6

7.5

Electrical Characteristics........................................... 7

7.6

Typical Characteristics ............................................ 11

8

Detailed Description ............................................ 14

8.1

Overview ................................................................. 14

8.2

Functional Block Diagram ....................................... 15

8.3

Feature Description................................................. 16

8.4

Controller Functional Modes ................................... 25

9

Application and Implementation ........................ 27

9.1

Application Information............................................ 27

9.2

Typical Application ................................................. 27

10

Power Supply Recommendations ..................... 44

11

Layout................................................................... 44

11.1

Layout Guidelines ................................................. 44

11.2

Layout Example .................................................... 44

12

Device and Documentation Support ................. 47

12.1

Custom Design With WEBENCH® Tools ............. 47

12.2

Receiving Notification of Documentation Updates 47

12.3

Community Resources.......................................... 47

12.4

Trademarks ........................................................... 47

12.5

Electrostatic Discharge Caution ............................ 47

12.6

Glossary ................................................................ 47

13

Mechanical, Packaging, and Orderable

Information ........................................................... 47

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision D (April, 2019) to Revision E

Page

•

Added target market applications. ......................................................................................................................................... 4

•

Added explanation for ZCD noise immunity. ......................................................................................................................... 4

•

Changed new variant of LLC controller. ............................................................................................................................... 14

•

Added burst mode modified.................................................................................................................................................. 14

•

Added burst mode levels for versions. ................................................................................................................................ 25

•

Added burst modes for different versions............................................................................................................................. 25

•

Changed boost inductance calculation. ............................................................................................................................... 30

•

Changed inductor requirements. ......................................................................................................................................... 31

Changes from Revision C (February 2018) to Revision D

Page

•

Added Link to UCC256403/4 LLC controller .......................................................................................................................... 1

•

Added Link to UCC24624 synchronous rectifier controller..................................................................................................... 1

•

Updated Description section................................................................................................................................................... 1

•

Updated Description section................................................................................................................................................... 1

•

Added Device Comparison Table........................................................................................................................................... 4

•

Changed VBSTFall graph into normalized graph. .................................................................................................................... 12

•

Changed VBSTRise graph into normalized graph. ................................................................................................................... 12

•

Changed VOSNSOVP1Rise graph into normalized graph............................................................................................................ 13

•

Changed VOSNSOVP1Fall graph into normalized graph............................................................................................................. 13

Changes from Revision B (January 2018) to Revision C

Page

•

Updated Description section .................................................................................................................................................. 1