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UM0984: DescriptionSTEVAL-ISA081V1 demonstration board based; File Size1MB，25 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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UM0984 Overview

STEVAL-ISA081V1 demonstration board based

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UM0984

User manual

STEVAL-ISA081V1 demonstration board based on a 12 V / 1 A

isolated flyback

Introduction

The purpose of this document is to provide information on the STEVAL-ISA081V1 switched

mode power supply (SMPS) demonstration board. The STEVAL-ISA081V1 is an isolated

SMPS capable of delivering a 12 W output over a wide input voltage range. It is designed for

a mains application focused on providing a cost-effective and space saving solution.

The STEVAL-ISA081V1 SMPS generates 12 V nominal output voltage using primary

regulation. This board is based on VIPer™26LD - a monolithic converter integrating a high

voltage MOSFET and PWM controller in one package.

This document contains a fundamental technical description of the demonstration board

(schematic diagram, PCB details, and bill of materials) as well as basic measurements

(load regulation, efficiency, standby behavior, EMI and thermal behavior data).

The last section of this document contains short recommendations on how to set different

output voltages in the range of 10 to 18 V and how to improve efficiency up to 86%.

Figure 1.

Demonstration board STEVAL-ISA081V1

June 2012

Doc ID 17812 Rev 2

1/25

www.st.com

Contents

UM0984

Contents

Main characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Board connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1

3.2

Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Description of main components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2.1

3.2.2

The input section contains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

The flyback converter consists of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.3

3.4

3.5

Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

BOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1

4.2

4.3

4.4

4.5

Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Standby . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Application recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.1

5.2

Output voltage operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Improved efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2/25

Doc ID 17812 Rev 2

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