STR-A6351

STR-A6300 Application Notes （Ver.1.2） STR-A6300 Series Application Notes(Ver. 1.2) May 15th, 2002 System Engineering Dept. Semiconductor Operations Sanken Electric Co., Ltd. Page 1 STR-A6300 Application Notes （Ver.1.2） CONTENTS 1. INTRODUCTION 2. FEATURES 3. LINE-UP OF STR-A6300 SERIES 4. OUTLINE DRAWINGS 5. BLOCK DIAGRAM 6. ELECTRICAL CHARACTERISTICS 7. FUNCTIONS OF EACH TERMINAL AND OPERATION 8. CALCULATION OF PRIMARY INDUCTANCE 9. DESIGN GUIDELINES 3 3 4 5 6 7~8 8~14 14 14~17 *Specifications and information herein are subject to change without notice. Page 2 STR-A6300 Application Notes （Ver.1.2） 1 INTRODUCTION STR-A6300 series is a hybrid IC with a built-in power MOSFET and a controller IC, designed for fly-back converter type SMPS(Switching Mode Power Supply) applications, packaged into DIP8, applicable for PRC operation only for small power SMPS. This IC realizes downsizing and standardizing of a power supply system that reduces external components count and simplifies circuit designs. (Note) PRC is abbreviation of “Pulse Ratio Control”(On-width control with fixed OFF-time). 2 FEATURES ●Small sized 8-pin DIP type full molded package, optimum IC for low-height SMPS ●Oscillator is incorporated in the monolithic control IC with adopting On-Chip-Trimming technology. ●Small temperature characteristics variation by adopting a comparator compensated for temperature in the control part ●Low start-up circuit current(50uA max) ●Built-in Active Low-Pass Filter for sta...