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Design Example Report
Title Specification Application Author Document Number Date Revision
Objective
This report lists a design for a single output offline non-isolated power supply for white goods low cost applications. * * * * * * Highly integrated solution Lowest possible component count No optocoupler or zener diode required for regulation Integrated thermal overload protection with automatic recovery Less then 300mW no-load consumption Very high efficiency at full load
1.8W non-isolated Power Supply using LNK304 Input: 85-265VAC Output: 12V/150mA Home Appliance Power Integrations Applications Department DER-45 April 8, 2005 1.0
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-45
LNK304 Single Output Supply
April 8, 2005
Table Of Contents
Introduction................................................................................................................. 3 Power Supply Specification ........................................................................................ 3 Schematic................................................................................................................... 4 Circuit Description ...................................................................................................... 4 Bill Of Materials .......................................................................................................... 5 Performance Data ...................................................................................................... 6 6.1 Efficiency............................................................................................................. 6 6.1.1 Full load efficiency........................................................................................ 6 6.1.2 No load consumption ................................................................................... 6 6.2 Regulation ........................................................................................................... 7 6.2.1 Line regulation.............................................................................................. 7 6.2.2 Load regulation ............................................................................................ 7 7 Revision History ......................................................................................................... 8 1 2 3 4 5 6
Important Note: This board is designed to be non-isolated. Please take necessary safety precautions. 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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Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-45
LNK304 Single Output Supply
April 8, 2005
1 Introduction
This document is an engineering report describing a 12V, 150mA non-isolated power supply using a LNK304 from Power Integrations. This document contains the power supply specification, schematic, bill of materials and measurements results.
2 Power Supply Specification
Description Input Voltage Frequency Outputs Output Voltage Output Ripple Voltage Output Current Total Output Power Continuous Output Power Peak Output Power Ambient Temperature Symbol VIN fLINE Min 85 47 Typ Max 265 63 Units VAC Hz Comment
50/60
VOUT VRIPPLE IOUT POUT POUT_PEAK TAMB 0
12 n.sp. 150 1.8
V mV mA W W
[10%] 20 MHz Bandwidth
70
o
C
Open frame
Table 1 - Power Supply Specifications
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Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-45
LNK304 Single Output Supply
April 8, 2005
3 Schematic
Rfb C1 Rfuse 10R 2 W fusible 85 ... 265 Vac Din 1N4007 Cin1 4.7 uF 400 V
FB BP
Lin 1mH
100 nF 50 V
S
13 k 1% Rbias 2.2 k 1%
D
Cfb 1 uF 50 V D1 UF4005
D2 1N4007
12 V 150 mA Rload 2.4 k 0.25 W
U1 LNK304 L1 Cin2 1 mH 220 mArms 4.7 uF 400 V
C2 47 uF 50 V Low ESR
+
Figure 1 - Complete Schematic
4 Circuit Description
The LNK304 is used in a non-isolated buck-boost topology. The voltage across L1 is rectified and smoothed by D1 and C2 during U1's off-time. To a first order the forward voltage drop of D2 (slow diode used in the tests) and D1 (must be an ultrafast) can be considered similar. Therefore the voltage across Cfb tracks the output voltage. The voltage across Cfb is sensed and regulated via the resistor divider Rfb-Rbias connected to U1's FB pin. The LNK304 switching algorithm regulates the FB pin to 1.65V +/- 7% over temperature. A small pre-load resistor has been added (Rload with 5mA current consumption) for operation down to 0mA output current.
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Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-45
LNK304 Single Output Supply
April 8, 2005
5 Bill Of Materials
Ref Rfuse Din Cin1, Cin2 Lin C1 D1 Rbias Rfb Cfb D2 Rload L1 C2 U1 Description 10R 2W fusible 1N4007 4u7 400V 1mH 100nF UF4005 2K2 1% 13K 1% 1uF 50V 1N4007 2K4 5% 0.25W 1mH 220mArms 47uF 50V LNK304P Uprice 0.0400 0.0072 0.0570 0.0290 0.0100 0.0450 0.0033 0.0033 0.0100 0.0072 0.0015 0.0700 0.0450 0.0000 QTY 1 1 2 1 1 1 1 1 1 1 1 1 1 1
Table 2 - Bill of Materials
Page 5 of 9
Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-45
LNK304 Single Output Supply
April 8, 2005
6 Performance Data
All measurements performed at room temperature, 50 Hz input frequency. 6.1 Efficiency
6.1.1 Full load efficiency
70.0 67.5 65.0 62.5 60.0 90 150 210 270
Figure 2 - Efficiency measurements vs. input voltage (@150mA load)
6.1.2 No load consumption
300.0
200.0
100.0
0.0 90 140 190 240
Figure 3 - Input power in mW at no load output
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Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-45
LNK304 Single Output Supply
April 8, 2005
6.2
Regulation
6.2.1 Line regulation
105.0 102.5 100.0 97.5 95.0 90 150 no load 60mA load 210 150mA load 270
Figure 4 - Output voltage tolerance (in % of the nominal output voltage level)
Vs. input voltage, @ 0.150mA load
6.2.2 Load regulation
103.00 102.00 101.00 100.00 99.00 98.00 97.00 96.00 95.00 0 20 40 60 90Vac input 80 100 250Vac input 120 140
Figure 5 - Load regulation (in % of the nominal output voltage level)
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Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-45
LNK304 Single Output Supply
April 8, 2005
7 Revision History
Date 4/8/05 Author TP Revision 1.0 Description & changes Initial release Reviewed VC/JC / AM
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Power Integrations Tel: +1 408 414 9200 Fax: +1 408 414 9201 www.powerint.com
DER-45
LNK304 Single Output Supply
April 8, 2005
For the latest updates, visit our Web site: www.powerint.com PATENT INFORMATION Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any license under its patent rights or the rights of others. 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. The PI Logo, TOPSwitch, TinySwitch, LinkSwitch, and EcoSmart are registered trademarks of Power Integrations. PI Expert and DPA-Switch are trademarks of Power Integrations. (c) Copyright 2003, Power Integrations.
WORLD HEADQUARTERS Power Integrations 5245 Hellyer Avenue, San Jose, CA 95138, USA Main: +1-408-414-9200 Customer Service: Phone: +1-408-414-9665 Fax: +1-408-414-9765 e-mail: usasales@powerint.com AMERICAS Power Integrations, Inc. 4335 South Lee Street, Suite G, Buford, GA 30518, USA Phone: +1-678-714-6033 Fax: +1-678-714-6012 e-mail: usasales@powerint.com
CHINA (SHENZHEN) Power Integrations International Holdings, Inc. Rm# 1705, Bao Hua Bldg. 1016 Hua Qiang Bei Lu, Shenzhen, Guangdong, 518031, China Phone: +86-755-8367-5143 Fax: +86-755-8377-9610 e-mail: chinasales@powerint.com GERMANY Power Integrations, GmbH Rueckerstrasse 3, D-80336, Munich, Germany Phone: +49-895-527-3910 Fax: +49-895-527-3920 e-mail: eurosales@powerint.com
ITALY Power Integrations s.r.l. Via Vittorio Veneto 12, Bresso, Milano, 20091, Italy Phone: +39-028-928-6001 Fax: +39-028-928-6009 e-mail: eurosales@powerint.com JAPAN Power Integrations, K.K. Keihin-Tatemono 1st Bldg. 12-20 Shin-Yokohama, 2-Chome, Kohoku-ku, Yokohama-shi, Kanagawa 222-0033, Japan Phone: +81-45-471-1021 Fax: +81-45-471-3717 e-mail: japansales@powerint.com KOREA Power Integrations International Holdings, Inc. 8th Floor, DongSung Bldg. 17-8 Yoido-dong, Youngdeungpo-gu, Seoul, 150-874, Korea Phone: +82-2-782-2840 Fax: +82-2-782-4427 e-mail: koreasales@powerint.com
SINGAPORE (ASIA PACIFIC HEADQUARTERS) Power Integrations, Singapore 51 Newton Road, #15-08/10 Goldhill Plaza, Singapore, 308900 Phone: +65-6358-2160 Fax: +65-6358-2015 e-mail: singaporesales@powerint.com TAIWAN Power Integrations International Holdings, Inc. 17F-3, No. 510, Chung Hsiao E. Rd., Sec. 5, Taipei, Taiwan 110, R.O.C. Phone: +886-2-2727-1221 Fax: +886-2-2727-1223 e-mail: taiwansales@powerint.com UK (EUROPE & AFRICA HEADQUARTERS) 1st Floor, St. James's House East Street Farnham, Surrey GU9 7TJ United Kingdom Phone: +44-1252-730-140 Fax: +44-1252-727-689 e-mail: eurosales@powerint.com
CHINA (SHANGHAI) Power Integrations International Holdings, Inc. Rm 807, Pacheer, Commercial Centre, 555 Nanjing West Road, Shanghai, 200041, China Phone: +86-21-6215-5548 Fax: +86-21-6215-2468 e-mail: chinasales@powerint.com APPLICATIONS HOTLINE World Wide +1-408-414-9660
INDIA (TECHNICAL SUPPORT) Innovatech 261/A, Ground Floor 7th Main, 17th Cross, Sadashivanagar Bangalore, India, 560080 Phone: +91-80-5113-8020 Fax: +91-80-5113-8023 e-mail: indiasales@powerint.com
APPLICATIONS FAX World Wide +1-408-414-9760
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