标签: mcp1650

ThischaptercontainsgeneralinformationthatwillbeusefultoknowbeforeusingtheMCP1650MultipleWhiteLEDDemoBoard.Itemsdiscussedinthischapterinclude:•DocumentLayout•ConventionsUsedinthisGuide•RecommendedReading•TheMicrochipWebSite•CustomerSupport•DocumentRevisionHistoryMCP1650MultipleWhiteLEDDemoBoardUser’sGuide2005MicrochipTechnologyInc.DS51586ANotethefollowingdetailsofthecodeprotectionfeatureonMicrochipdevices:MicrochipproductsmeetthespecificationcontainedintheirparticularMicrochipDataSheet.Microchipbelievesthatitsfamilyofproductsisoneofthemostsecurefamiliesofitskindonthemarkettoday,whenusedintheintendedmannerandundernormalconditions.Therearedishonestandpossiblyillegalmethodsusedtobreachthecodeprotectionfeature.Allofthesemethods,toourknowledge,requireusingtheMicrochipproductsinamanneroutsid……

ThissectioncontainsgeneralinformationthatwillbeusefultoknowpriortousingtheMCP1650BoostControllerEvaluationBoard.ThisboardsupportstheMCP1650/51/52/53devicefamily.Thissectioncoversthefollowingtopics:•AboutthisGuide•RecommendedReading•TheMicrochipInternetWebSite•CustomerSupportMMCP1650/1/2/3EvaluationBoardUser’sGuide2004MicrochipTechnologyInc.DS51462ANotethefollowingdetailsofthecodeprotectionfeatureonMicrochipdevices:MicrochipproductsmeetthespecificationcontainedintheirparticularMicrochipDataSheet.Microchipbelievesthatitsfamilyofproductsisoneofthemostsecurefamiliesofitskindonthemarkettoday,whenusedintheintendedmannerandundernormalconditions.Therearedishonestandpossiblyillegalmethodsusedtobreachthecodeprotectionfeature.Allofthesemethods,toourknowledge,requireusingtheMicrochipproduct……

ThischaptercontainsgeneralinformationthatwillbeusefultoknowbeforeusingtheMCP1650SEPICDemoBoard.Itemsdiscussedinthischapterinclude:•DocumentLayout•ConventionsUsedinthisGuide•RecommendedReading•TheMicrochipWebSite•CustomerSupport•DocumentRevisionHistoryMCP1650SEPICDemoBoardUser’sGuide2005MicrochipTechnologyInc.DS51581ANotethefollowingdetailsofthecodeprotectionfeatureonMicrochipdevices:MicrochipproductsmeetthespecificationcontainedintheirparticularMicrochipDataSheet.Microchipbelievesthatitsfamilyofproductsisoneofthemostsecurefamiliesofitskindonthemarkettoday,whenusedintheintendedmannerandundernormalconditions.Therearedishonestandpossiblyillegalmethodsusedtobreachthecodeprotectionfeature.Allofthesemethods,toourknowledge,requireusingtheMicrochipproductsinamanneroutsidetheoperatingspecificationscontainedinMicrochi……

当今的电子电路需要许多不同的电压。为单片机或数字逻辑芯片供电的电压通常与偏置电压或驱动LED串的电压不同。一个系统中常常包含不同电压需求的电路，由于整个系统只有一个输入电压，因此需要采用电源转换器产生所需的其他电压。电源转换器可以是基于电感的开关模式电源转换器、开关电容电荷泵或线性稳压器。每一种转换器都有各自的优缺点，但特定的应用需求决定了何种转换器最合适。本应用笔记将针对基于电感的开关模式电源转换器，更确切地说应该是升压转换器拓扑结构。升压转换器是最基本的开关电源转换拓扑结构之一，另一种是降压转换器。从这两种拓扑结构可以推导出其他各种开关电源拓扑结构。降压转换用于从未经稳压的输入电源产生相对较低的稳压电压。升压转换用于从未经稳压的输入电源产生相对较高的稳压电压。我们将以Microchip的MCP1650升压控制器为例来介绍升压转换器的设计。AN980利用MCP1650设计升压直流/直流变换器作者：CliffEllison理解升压变换拓扑结构MicrochipTechnologyInc.在我们开始介绍设计示例前，有必要理解升压转换器产生的输出电压为何总是高于输入电压。因此，我们来分简介析图1中的升压转换器电路。在一个开关周期中，开关（S1）在闭合与打开两个位置间切换。如果在开关周期当今的电子电路需要许多不同的电压。为单片机或数字开始时，S1处于闭合位置（如图1B），二极管D1反逻辑芯片供电的电压通常与偏置电压或驱动LED串的电向偏置，升压电感（L1）上的电压等于VIN，L1上的电压不同。一个系统中常常包含不同电压需求的电路，由流线性增加。在此阶段，负载上的电压由输出电容于整个系统只有一个输入电压，因此需要采用电源转……