Datasheet UC1846, UC1847, UC2846 UC2847, UC3846, UC3847 (Texas Instruments) - 2

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UC1846, UC1847 , UC2846 UC2847, UC3846 , UC3847
SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015
www.ti.com Table of Contents 1 Features
.. 1 7.4 Device Functional Modes.. 10
2 Applications
... 1
8 Application and Implementation
.. 11 8.1 Application Information.. 11
3 Description
... 1 8.2 Typical Application ... 11
4 Revision History
... 2
9 Power Supply Recommendations
.. 15
5 Pin Configuration and Functions
... 3
10 Layout
... 16
6 Specifications
... 4 10.1 Layout Guidelines ... 16 6.1 Absolute Maximum Ratings .. 4 10.2 Layout Example .. 16 6.2 ESD Ratings.. 4
11 Device and Documentation Support
... 17 6.3 Recommended Operating Conditions ... 4 11.1 Related Links .. 17 6.4 Thermal Information .. 4 11.2 Community Resources.. 17 6.5 Electrical Characteristics... 5 11.3 Trademarks ... 17 6.6 Typical Characteristics .. 7 11.4 Electrostatic Discharge Caution .. 17
7 Detailed Description
.. 8 11.5 Glossary .. 17 7.1 Overview ... 8
12 Mechanical, Packaging, and Orderable
7.2 Functional Block Diagram ... 8
Information
... 17 7.3 Feature Description... 8
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (July 2010) to Revision C 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 • Removed soldering temperature ... 4
Changes from Revision A (February 2002) to Revision B Page
• Updated Block Diagram. .. 1 2 Submit Documentation Feedback Copyright © 1997–2015, Texas Instruments Incorporated Product Folder Links: UC1846 UC1847 UC2846 UC2847 UC3846 UC3847 Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 ESD Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 Electrical Characteristics 6.6 Typical Characteristics 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Current Sense Amplifier 7.3.2 Oscillator 7.4 Device Functional Modes 7.4.1 Current Limit 7.4.2 Shutdown 8 Application and Implementation 8.1 Application Information 8.2 Typical Application 8.2.1 Design Requirements 8.2.2 Detailed Design Procedure 8.2.2.1 Design Switching Frequency 8.2.2.2 Error Amplifier Output Configuration 8.2.2.3 Parallel Operation Configuration 8.2.2.4 Design Pulse by Pulse Current Limit Threshold 8.2.2.5 Soft-Start and Shutdown, Restart Function Design 8.2.3 Application Curves 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.2 Layout Example 11 Device and Documentation Support 11.1 Related Links 11.2 Community Resources 11.3 Trademarks 11.4 Electrostatic Discharge Caution 11.5 Glossary 12 Mechanical, Packaging, and Orderable Information