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| 型號(hào)： | AN-23 |
| 英文描述： | TinySwitch Flyback Design Methodology |
| 中文描述： | 據(jù)稱，TinySwitch反激式設(shè)計(jì)方法 |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大?。?/td> | 401K |
| 代理商： | AN-23 |
July 1999
TinySwitch
Flyback Design
Methodology
Application Note AN-23
Figure 1. Typical TinySwitch Flyback Power Supply.
Introduction
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
Methodology is to provide power supply engineers a handy tool
that not only eases the design task but also delivers design
optimization in cost and efficiency for most applications.
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
remains unchanged from application to application. Application
specific issues outside this basic configuration such as constant
current, constant power outputs, etc. are beyond the scope of
this document.
Figure 1 shows the basic circuit configuration in a typical
TinySwitch
flyback design using TNY253.
Design Flow
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:
1. Calculate minimum reflected voltage, V
OR
, allowed by a
given output diode.
2. Design for discontinuous mode operation using this calculated
V
OR
. If necessary, increase V
OR
.
3. At V
= 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.
TM
PI-2336-112098
D
S
EN
BP
+
-
C
IN
0.1
μ
F
VAC
Fusible
Snubber Circuit
Output capacitor
V
O
Output post filter L, C
Bypass pin capacitor
Feedback Sense
Circuit
TNY253
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