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AN-23

更新时间： 2024-01-11 08:38:05

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TinySwitch Flyback Design Methodology

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TinySwitch Flyback Design

Methodology

Application Note AN-23

Design Flow

Introduction

Figures 2A, B and C present a design flow chart showing the

complete design procedure in 22 steps. The logic behind this

Design Methodology can be summarized as follows:

This document describes a simple Design Methodology for

flyback power supply design using the TinySwitch family of

integrated off-line switchers. The objective of this Design

Methodologyistoprovidepowersupplyengineersahandytool

that not only eases the design task but also delivers design

optimization in cost and efficiency for most applications.

1. Calculate minimum reflected voltage, V_OR, allowed by a

given output diode.

2. Designfordiscontinuousmodeoperationusingthiscalculated

V_OR. If necessary, increase V_OR.

Basic Circuit Configuration

Because of the high level integration of TinySwitch, flyback

power supply design is greatly simplified. As a result, the basic

circuit configuration of TinySwitch flyback power supplies

remainsunchangedfromapplicationtoapplication. Application

specific issues outside this basic configuration such as constant

current, constant power outputs, etc. are beyond the scope of

this document.

3. At V_OR= 150 V, select bigger TinySwitch to stay in

discontinuous mode or go to continuous mode design.

4. Design transformer using EE16 core.

5. Select feedback circuit and other components to complete

the design.

Figure 1 shows the basic circuit configuration in a typical

TinySwitch flyback design using TNY253.

Output capacitor

Output post filter L, C

V_O

TNY253

C_IN

Fusible

VAC

0.1 µF

Feedback Sense

Circuit

Bypass pin capacitor

Snubber Circuit

PI-2336-112098

Figure 1. Typical TinySwitch Flyback Power Supply.

July 1999

12 3 4 5 6 7...12

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