Design Example Report
Title
4.9W power supply using TNY266P
Input: 90 – 265 VAC
Specification
Output: 5V/1.5A, 3.3V/1.5A, 12V/0.5A,
-12V/15mA
Application
Author
Document
Number
Date
Revision
DVD Player
Power Integrations Applications Department
DER-10
February 4, 2004
1.0
Summary and Features
•
•
•
•
•
•
•
Low cost
no common-mode choke
no Y-cap
no X-cap
low EMI even with output grounded
good output cross-regulation even with no TL431
~ 200 mW input power during standby using low-cost “DC Switch”
The products and applications illustrated herein (including circuits external to the products and transformer
construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign
patent applications assigned to Power Integrations. A complete list of Power Integrations’ patents may be found
at
www.powerint.com.
Power Integrations
5245 Hellyer Avenue, San Jose, CA 95138 USA.
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
DER-10
4.9W DVD power supply using TNY266P
February 4, 2004
Table Of Contents
Introduction................................................................................................................. 3
Photograph................................................................................................................. 4
Power Supply Specification ........................................................................................ 5
Schematic................................................................................................................... 6
Circuit Description ...................................................................................................... 7
5.1
Input EMI Filtering ............................................................................................... 7
5.2
Primary Clamp Snubber ...................................................................................... 7
5.3
Output filtering..................................................................................................... 7
5.4
Output Feedback................................................................................................. 7
5.5
“DC Switch” ......................................................................................................... 7
6 PCB Layout ................................................................................................................ 8
7 Bill Of Materials .......................................................................................................... 9
8 Transformer Specification......................................................................................... 10
8.1
Electrical Diagram ............................................................................................. 10
8.2
Electrical Specifications..................................................................................... 10
8.3
Materials............................................................................................................ 10
8.4
Transformer Build Diagram ............................................................................... 11
8.5
Copper Foil Preparation .................................................................................... 11
8.6
Transformer Construction.................................................................................. 12
9 Transformer Spreadsheets....................................................................................... 13
Performance Data................................................................................................. 16
10
10.1 Standby Input Power during DC switch off operation ........................................ 16
10.2 Full-load Efficiency ............................................................................................ 16
10.3 Input Power Consumption during Standby ........................................................ 16
10.4 Cross Regulation............................................................................................... 17
Thermal Performance............................................................................................... 17
11
Minimum Operating Voltage and Peak Power Margin .......................................... 17
12
Output ripple and Noise Waveforms ..................................................................... 18
Conducted EMI ..................................................................................................... 20
13
14
Revision History.................................................................................................... 21
Important Notes:
Although this board is designed to satisfy safety isolation requirements, the engineering
prototype has not been agency approved. Therefore, all testing should be performed
using an isolation transformer to provide the AC input to the prototype board.
Design Reports contain a power supply design specification, schematic, bill of materials,
and transformer documentation. Performance data and typical operation characteristics
are included. Typically only a single prototype has been built.
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5
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
Page 2 of 22
DER-10
4.9W DVD power supply using TNY266P
February 4, 2004
1 Introduction
This document is an engineering report describing an 4.9W (8.5 W peak) multiple output
power supply utilizing a TNY266P for a DVD player.
This design is low cost and meets EMI with no common-mode choke, no X-cap, and no
Y-cap. This is possible with TinySwitch-II because of its built-in frequency jitter.
Cross-regulation is tight in spite of having a simple low-cost zener regulation scheme.
This is possible with TinySwitch-II because of its unique feedback scheme.
A low-cost non-Safety rated “DC Switch” allows shutdown with ~200 mW consumption at
230 Vac. This is possible with TinySwitch-II because of its
EcoSmart
features.
This document contains the power supply specification, schematic, bill of materials,
transformer documentation, printed circuit layout, and performance data.
Page 3 of 22
Power Integrations
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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