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The document directs designers to key sources such as TOPSwitch data sheets, design notes, and reference design/evaluation board documentation before starting. It organizes guidance around example power supply circuits, drain clamping, PC layout practices, transformer design considerations, efficiency optimization, thermal design, auto-restart behavior, protection and duty-cycle topics, control-loop methods, and EMI advantages.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/topswitch-tips-techniques-and-troubleshooting-guide-application-note-an-14/562858/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/topswitch-tips-techniques-and-troubleshooting-guide-application-note-an-14/562858.png","ImageObject",300,407,{"name":92,"@type":93},"ahduag","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-13","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"Where can the answers to common TOPSwitch technical questions be found?","Question",{"text":112,"@type":113},"The document states that answers can be found in the application note itself, the TOPSwitch data sheets, the TOPSwitch design notes, and the TOPSwitch reference design/evaluation board documentation.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What is recommended as the fastest path to successful TOPSwitch design?",{"text":117,"@type":113},"Read the TOPSwitch data sheets and this document carefully and completely before beginning the design, with AN-16 also identified as important.",{"name":119,"@type":110,"acceptedAnswer":120},"What guidance does the document provide when dealing with working power supply problems?",{"text":121,"@type":113},"For problems encountered in working power supplies, it instructs readers to refer directly to the Troubleshooting Guide.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},562858,1791841454,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},3985747870414,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","TOPSwitch 􀃒 Tips, Techniques, and Troubleshooting Guide  \nApplication Note AN-14  \nAnswers to All Common TOPSwitch Technical Questions  \ncan be found in this application note, the TOPSwitch Data Sheets, the TOPSwitch Design Notes, and the TOPSwitch reference design/evaluation board documentation. The fastest path to TOPSwitch success is to read the TOPSwitch data sheets, AN-16 and this document carefully and completely before beginning the design. Detailed information on specific application circuits can be found in the Application Notes, Design Notes and Reference Design/Evaluation Board documentation listed below. Purchasing a Reference Design/  \nOther Design/Application Notes  \nAN-15: TOPSwitch Power Supply Design Techniques for EMI and Safety  \nAN-16: TOPSwitch Flyback Design Methodology  \nAN-17: Flyback Transformer Design for TOPSwitch Power Supplies  \nAN-18: TOPSwitch Flyback Transformer Construction Guide AN-19: TOPSwitch Flyback Power Supply Efficiency  \nAN-20: Transient Suppression Techniques for TOPSwitch Power Supplies  \nEvaluation Board is strongly recommended and will dramatically reduce design, breadboarding, and debugging time. For information on specific subjects including PC design, Drain Voltage Clamping, and Recommended Transformer Inductance, find the appropriate section in the table of contentson the next page. For problems encountered in working power supplies, refer directly to the Troubleshooting Guide. For technical questions not covered by any TOPSwitch literature, fill out a copy of the TOPFAX form given at the end of this application note and FAX to Power Integrations, Inc.  \nDN-7: Power Factor Correction Using TOPSwitch  \nDN-8: Simple Bias Supplies Using the TOP200  \nDN-11: A Low-Cost, Low Part Count TOPSwitch Supply DN-12: Non-isolated Flyback Supplies Using TOPSwitch  \nDN-14: Constant Current/Constant Power Regulation Circuits for TOPSwitch  \nDN-15: TOPSwitch Power Supply for Echelon PLT-21 Power Line Transceiver  \nDN-16: DC to DC Converters Using TOPSwitch for Telecom and Cablecom Applications  \nReference Design/Evaluation Board Documentation  \nST200: TOP200 Reference Design Board  \n95 to 370 Volt DC Input; 5V, 5W Output  \n(Replaced by RD1)  \nST202A: TOP202 Reference Design Board  \nUniversal AC Input; 7.5V, 15W Output  \nST204A: TOP204 Reference Design Board  \nUniversal AC Input; 15V, 30W Output  \nRD-1: TOP210 Reference Design Board  \n104 to 370 VDC Input, 4W Output  \nRD-2: TOP210 Reference Design Board  \n85 to 132 VAC or 170 to 265 VAC input; 8W Output  \nAN-14  \nTable of Contents  \n1. Troubleshooting Guide.................................................................................................................................................................. 3  \n2. Example Power Supply Circuits  \n2.1 DC Input, 5V, 5W, Bias Winding Control Using the TOP200 ............................................................................................... 7  \n2.2 Universal Input, 7.5V, 15W, Optocoupler/Zener Control Using the TOP202 ....................................................................... 8  \n2.3 Universal Input, 15V, 30W, Optocoupler/TL431 Control Using the TOP204 ....................................................................... 9  \n3. Drain Clamping............................................................................................................................................................................ 10  \n4. PC Layout  \n4.1 Single Point Grounding......................................................................................................................................................... 11  \n4.2 Ideal Component Placement................................................................................................................................................. 11  \n4.3 PC Layout Checklist............................................................................................................................................................","cbCaibNBAhWxjdja","https://ap.wps.com/l/cbCaibNBAhWxjdja","pdf",186775,28,"English","# 1. Troubleshooting Guide\n# 2. Example Power Supply Circuits\n## 2.1 DC Input, 5V, 5W, Bias Winding Control Using the TOP200\n## 2.2 Universal Input, 7.5V, 15W, Optocoupler/Zener Control Using the TOP202\n## 2.3 Universal Input, 15V, 30W, Optocoupler/TL431 Control Using the TOP204\n# 3. Drain Clamping\n# 4. PC Layout\n## 4.1 Single Point Grounding\n## 4.2 Ideal Component Placement\n## 4.3 PC Layout Checklist\n# 5. Flyback Power Supply Transformer\n## 5.1 Power and Inductance Ranges\n## 5.2 Transformer Turns Ratio Curves\n# 6. Optimizing Power Supply Efficiency\n# 7. Thermal Design\n# 8. Auto-Restart\n# 9. Output Overvoltage Protection\n# 10. Current to Duty Cycle Conversion\n# 11. Minimum Duty Cycle Operation\n# 12. Control Loop\n## 12.1 Basic Techniques\n## 12.2 Enhanced Bandwidth\n# 13. EMI\n## 13.1 TOPSwitch Advantages","[{\"question\":\"Where can the answers to common TOPSwitch technical questions be found?\",\"answer\":\"The document states that answers can be found in the application note itself, the TOPSwitch data sheets, the TOPSwitch design notes, and the TOPSwitch reference design/evaluation board documentation.\"},{\"question\":\"What is recommended as the fastest path to successful TOPSwitch design?\",\"answer\":\"Read the TOPSwitch data sheets and this document carefully and completely before beginning the design, with AN-16 also identified as important.\"},{\"question\":\"What guidance does the document provide when dealing with working power supply problems?\",\"answer\":\"For problems encountered in working power supplies, it instructs readers to refer directly to the Troubleshooting Guide.\"}]","TOPSwitch - Tips, Techniques, and Troubleshooting Guide - Application Note AN-14 | PDF",1791809914,71]