CONTENTS
1. INTRODUCTION................................................................................................................................
5
2. BASIC STRUCTURE OF A POWER SUPPLY IC.......................................................................
2.1 Structure of a Bipolar IC...........................................................................................................................
2.2 About Power Supply IC Equivalent Circuits..............................................................................................
5
5
6
3. BASIC CIRCUITS OF A POWER SUPPLY IC............................................................................
7
3.1 Basic Circuits ...........................................................................................................................................
7
3.2 Operating Principles of Adjustable Output Types..................................................................................... 11
3.3 Operating Principles of Low Saturation Types ......................................................................................... 12
4. POWER SUPPLY IC APPLICATION CIRCUITS .......................................................................... 13
4.1 Typical Circuit Connection........................................................................................................................ 13
4.2 Application Circuit Set.............................................................................................................................. 17
5. PRECAUTIONS ON APPLICATION ............................................................................................... 22
5.1 Shorting Input Pins and Ground Pins ....................................................................................................... 22
5.2 Floating Ground Pins ............................................................................................................................... 22
5.3 Applying Transient Voltage to Input Pins.................................................................................................. 23
5.4 Reverse Bias Between Output Pin and GND Pin..................................................................................... 23
5.5 Precautions Related to Low Saturation Types ......................................................................................... 24
5.6 Thinking on Various Protection Circuits.................................................................................................... 24
6. POWER SUPPLY IC DATA SHEET APPEARANCE AND DESIGN METHODS..................... 24
6.1 Absolute Maximum Ratings...................................................................................................................... 24
6.2 Recommended Operating Conditions ...................................................................................................... 24
6.3 Electrical Specifications............................................................................................................................ 25
6.4 Design Methods ....................................................................................................................................... 28
4
User’s Manual G12702EJ8V0UM00
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