Sanken Electric Co., Ltd. STR3A453D | Demoboard DEE0009

Description

This document describes the design example of a power supply using the STR3A453D intended for the non-isolated buck converter that supports universal inputs and a 15 V/0.7 A output (0.8 A peak). The STR3A453D is a current mode PWM control IC with a built-in power MOSFET, developed for isolated flyback converters. However, the IC is also suitable for configuring non-isolated buck converters. In addition, the design example uses the SJPD-L5 as a fast recovery diode for the freewheeling diode, and the SJPD-D5 as a fast recovery diode for the IC’s power supply.This document contains the following: the specifications of the design example, circuit diagrams, the bill of materials, the setting examples of component constants, a pattern layout example, and the evaluation results of the power supply characteristics. For more details on the parts listed in this document, refer to the corresponding data sheets.

Features

• Reduced Number of External Components (Built-in Startup Circuit)
• High Efficiency in All Load Ranges Achieved by Load-based Auto-shifting Operation Modes Normal Operation: PWM Mode, 65 kHz (Typ.) Light-load Operation: Green Mode Standby Operation: Burst Oscillation Mode
• Efficiency: 84.3% (230 VAC, 10.5 W)
• Input Power at No Load: 42.8 mW (230 VAC)
• Reduced EMI Noise (Random Switching Function)

Typical applications

• Small Home Appliance, Large Home Appliance
• Auxiliary Power Supply, Other SMPSs (Switching Mode Power Supplies)
• Power Supply for Motor Control

More information

• Datasheet
• IC product information