[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-343274-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-343274-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","top221-227-three-terminal-off-line-pwm-switch","TOP221-227 - Three-Terminal Off-Line PWM Switch","","TOPSwitch-II family TOP221-227 is a three-terminal off-line PWM power switch built as a self-biased, protected current-to-duty-cycle converter with open-drain output. It targets high efficiency through CMOS integration, reducing bias currents and eliminating external current-sense and start-up resistors. The document details product highlights, application range for flyback/forward/boost/buck topologies, conduction modes, pin functions, thermal shutdown and auto-restart behavior, plus an output power table across TO-220 and DIP/SMD packages.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/top221-227-three-terminal-off-line-pwm-switch/343274/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/top221-227-three-terminal-off-line-pwm-switch/343274.png","ImageObject",300,407,{"name":42,"@type":43},"Patrick","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-26","2026-09-22",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",9,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What are the key benefits highlighted for the TOP221-227 switch?","Question",{"text":63,"@type":64},"The highlights emphasize lowest cost and component count, very low AC/DC losses with up to 90% efficiency, built-in auto-restart and current limiting, latching thermal shutdown for protection, and support for multiple converter topologies.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"Which circuit topologies does TOPSwitch-II implement with the TOP221-227 family?",{"text":68,"@type":64},"The document states it implements Flyback, Forward, Boost, or Buck topology and can work with primary or opto feedback, in discontinuous or continuous conduction modes.",{"name":70,"@type":61,"acceptedAnswer":71},"What are the main functions of the DRAIN, CONTROL, and SOURCE pins?",{"text":72,"@type":64},"DRAIN provides the MOSFET drain connection and internal bias current during start-up. CONTROL carries the error amplifier and feedback current input for duty-cycle control. SOURCE provides the output MOSFET source connection and serves as the primary-side common/reference point, with an additional SOURCE (HV RTN) pin for P and G packages.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},343274,1790436240,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,105,110,115,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":103,"slug":104},6,50,"technology",{"id":106,"doc_module":4,"doc_module_name":25,"category_name":107,"show_sort_weight":108,"slug":109},7,"Healthcare",40,"healthcare",{"id":111,"doc_module":4,"doc_module_name":25,"category_name":112,"show_sort_weight":113,"slug":114},8,"Research & Report",30,"research-report",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":102,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":117,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":143,"read_time":103},549758146520,"https://ap-avatar.wpscdn.com/avatar/80002397d8c0411e94?_k=1775819394049821470","This product is not recommended for new designs.  \nTOP221-227  \nTOPSwitch-II Family  \nThree-Terminal Off-Line PWM Switch  \nProduct Highlights  \n• Lowest cost, lowest component count switcher solution  \n• Cost competitive with linears above 5 W  \n• Very low AC/DC losses – up to 90% efficiency  \n• Built-in Auto-restart and Current limiting  \n• Latching Thermal shutdown for system level protection  \n• Implements Flyback, Forward, Boost or Buck topology  \n• Works with primary or opto feedback  \n• Stable in discontinuous or continuous conduction mode  \n• Source connected tab for low EMI  \n• Circuit simplicity and Design Tools reduce time to market  \nDescription  \nThe second generation TOPSwitch™-II family is more cost effective and provides several enhancements over the first generation TOPSwitch family. The TOPSwitch-II family extends the power range from 100W to 150W for 100/115/  \n230 VAC input and from 50W to 90W for 85-265 VAC universal input. This brings TOPSwitch technology advantages to many new applications, i.e. TV, Monitor, Audio amplifiers, etc. Many significant circuit enhancements that reduce the sensitivity to board layout and line transients now make the design even easier. The standard 8L PDIP package option  \nPI-1951-091996  \nFigure 1. Typical Flyback Application.  \nreduces cost in lower power, high efficiency applications. The internal lead frame of this package uses six of its pins to transfer heat from the chip directly to the board, eliminating the cost of a heat sink. TOPSwitch incorporates all functions necessary for a switched mode control system into a three terminal monolithic IC: power MOSFET, PWM controller, high voltage start up circuit, loop compensation and fault protection circuitry.  \n\n| Output Power Table |  |  |  |  |  |  |  |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| TO-220 (Y) Package1 |  |  | 8L PDIP (P) or 8L SMD (G) Package2 |  |  |  |  |  |\n| PART\u003Cbr>ORDER\u003Cbr>NUMBER | Single Voltage Input 3 100/115/230 VAC ±15% | Wide Range Input 85 to 265 VAC | PART\u003Cbr>ORDER\u003Cbr>NUMBER | Single Voltage Input3 100/115/230 VAC ±15% |  |  | Wide Range Input 85 to 265 VAC |  |\n|  | PMAX4,6 | PMAX4,6 |  | |  | PMAX5,6  |  | PMAX5,6 |\n| TOP221YN | 12 W | 7 W | TOP221PN or TOP221GN |  | 9 W |  |  | 6 W |\n| TOP222YN | 25 W | 15 W | TOP222PN or TOP222GN |  | 15 W |  |  | 10 W |\n| TOP223YN | 50 W | 30 W | TOP223PN or TOP223GN |  | 25 W |  |  | 15 W |\n| TOP224YN | 75 W | 45 W | TOP224PN or TOP224GN |  | 30 W |  |  | 20 W |\n| TOP225YN | 100 W | 60 W |  |  |  |  |  |  |\n| TOP226YN | 125 W | 75 W |  |  |  |  |  |  |\n| TOP227YN | 150 W | 90 W |  |  |  |  |  |  |\n\nNotes: 1. Package outline: TO-220/3 2. Package Outline: DIP-8 or SMD-8 3. 100/115 VAC with doubler input 4. Assumes appropriate heat sinking to keep the maximum TOPSwitch junction temperature below 100 °C. 5. Soldered to 1 sq. in. (6 .45 cm2), 2 oz. copper clad (610 gm/m2) 6. PMAX is the maximum practical continuous power output level for conditions shown. The continuous power capability in a given application depends on thermal environment, transformer design, efficiency required, minimum specified input voltage, input storage capacitance, etc. 7. Refer to key application considerations section when using TOPSwitch-II inan existing TOPSwitch design.  \n[www.power.com](www.power.com) August 2016  \nThis Product is Covered by Patents and/or Pending Patent Applications.  \nTOP221-227  \n\n| CONTROL | | DRAIN\u003Cbr>SOURCE |\n| --- | --- | --- |\n| PI-1935-091696 |  |  |\n\nFigure 2. Functional Block Diagram.  \nPin Functional Description  \nDRAIN Pin:  \nOutput MOSFET drain connection. Provides internal bias current during start-up operation via an internal switched high-voltage current source. Internal current sense point.  \nCONTROL Pin:  \nError amplifier and feedback current input pin for duty cycle control. Internal shunt regulator connection to provide internal bias current during normal operation. It is also used asthe connection point for the supply bypass","cbCaiimQjAIJUICT","https://ap.wps.com/l/cbCaiimQjAIJUICT","pdf",1567360,"English","# Product Highlights\n# Description\n# Output Power Table\n# Control, Drain, Source and Pin Functional Description\n## DRAIN Pin\n## CONTROL Pin\n## SOURCE Pin\n## SOURCE (HV RTN) Pin\n## Pin Configuration\n# TOPSwitch-II Family Functional Description\n## Duty cycle control relationship\n## Auto-restart","[{\"question\":\"What are the key benefits highlighted for the TOP221-227 switch?\",\"answer\":\"The highlights emphasize lowest cost and component count, very low AC/DC losses with up to 90% efficiency, built-in auto-restart and current limiting, latching thermal shutdown for protection, and support for multiple converter topologies.\"},{\"question\":\"Which circuit topologies does TOPSwitch-II implement with the TOP221-227 family?\",\"answer\":\"The document states it implements Flyback, Forward, Boost, or Buck topology and can work with primary or opto feedback, in discontinuous or continuous conduction modes.\"},{\"question\":\"What are the main functions of the DRAIN, CONTROL, and SOURCE pins?\",\"answer\":\"DRAIN provides the MOSFET drain connection and internal bias current during start-up. CONTROL carries the error amplifier and feedback current input for duty-cycle control. SOURCE provides the output MOSFET source connection and serves as the primary-side common/reference point, with an additional SOURCE (HV RTN) pin for P and G packages.\"}]","TOP221-227 - Three-Terminal Off-Line PWM Switch | PDF",1790050538]