• 低压差线性稳压改善白光LED的亮度匹配-LDO Linear

    Abstract: A simple, tradiTIonal method of powering white light-emitTIng-diodes (LEDs) with fixed bias voltage and ballast resistors result in poor brightness matching between LEDs. This is due to wide

    led

    本站整理 . 2009-04-27 530

  • 结构紧凑,无电感升压电路调节白光LED偏置电流-Compac

    Abstract: This arTIcle shows how to use the MAX1759 buck/boost charge pump to power white LEDs for display backlighTIng in portable applicaTIons. The increasing use of color LCDs in hand-held equipmen

    led

    本站整理 . 2009-04-27 495

  • 混合电路驱动器的类型和数量的LED-Circuit Driv

    Portable systems often use LEDs of different colors-white for the display backlight, green for keypad illuminaTIon, red for power, etc., and in varying quanTITIes of each. Typically the LEDs are drive

    驱动器

    本站整理 . 2009-04-27 720

  • 单管控制第二LED阵列在开关模式LED背灯-Single F

    White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than those based on CCFL and EL technology. As a result, the white-LED backlight is increa

    led

    本站整理 . 2009-04-27 565

  • 利用LDO改善白光LED的匹配度

    摘要:白光发光二极管(LED)在各种照明设备中的应用正在稳步增长,如手持产品中的闪光灯、显示器背光等。与白炽灯相比,它们提供真正的白光、消耗更低的功耗。与荧光灯相比,它们更易于使用。批量使用时,白光LED的一致性较差,利用低成本的线性稳压器(LDO)可以改善其匹配度,即使在采用不同LED的情况下。 自从几年前发明了白光LED以来,白光LED的应用得到了稳步发展。与荧光灯相比具有使用简单、成本低的优

    led

    本站整理 . 2009-04-27 615

  • 白色LED的恒流驱动

    摘要:用白色LED为显示器或其他照明设备做背光源时,需要对其进行恒流驱动,主要原因是: 避免驱动电流超出最大额定值,影响其可靠性。 获得预期的亮度要求,并保证各个LED亮度、色度的一致性。本文描述了典型LED的参数范围和恒流驱动电路。 图1给出了六只随机挑选的白光LED (其中三只来自两家顶级产商)的正向电流随正向电压的变化关系曲线,这种情况下,如果用3.4V驱动这六只LED,相应的正向电流差别较

    led

    本站整理 . 2009-04-27 670

  • 白光LED驱动器提供64级对数调光-White-LED Dr

    Abstract: This circuit drives as many as four white LEDs in parallel from a 3.3V source, and adjusts the total LED current from 1mA to 106mA, in 64 steps of 1dB each. The circuit of Figure 1 is design

    led

    本站整理 . 2009-04-27 550

  • 负电荷泵为WLED背光应用提供堪比电感电路的高效率

    摘要:设计人员通常采用电荷泵或基于电感的boost电路提供白光LED (WLED)的正向导通偏置电压。电荷泵价格较低且使用方便,但截至目前,这种架构所能提供的效率低于基于电感的boost电路。本应用笔记介绍的负电荷泵方案能够达到基于电感的设计方案的效率,并且,由于省去了电感可大大简化系统设计并降低成本。 类似文章还发表在Maxim工程期刊,第64期(PDF,2.5MB)。 概述白光LED (WLE

    led

    本站整理 . 2009-04-27 585

  • 在静态MAX6956和MAX6957 LED驱动器中加入全球

    Abstract: This applicaTIon note discusses techniques to change the intensity of all the LED segments of a display at once (global intensity control) driven by the MAX6956 or MAX6957 staTIc LED drivers

    驱动器

    本站整理 . 2009-04-27 570

  • 选择数字和字母显示配置的MAX6954和MAX6955的SP

    Abstract: This applicaTIon note uses a web based Java program to allow an engineer to simulate the wide range of display configuraTIons of the MAX6954 and MAX6955 serial interfaced LED display drivers

    led

    本站整理 . 2009-04-27 560

  • 使用MAX6950和MAX6951LED显示驱动器的多重双数

    Abstract: This applicaTIon note discusses how to connect the MAX6950 (5 digit) and MAX6951 (8 digit) 7-segment LED display drivers to mulTIplex dual digit LED displays instead of regular single digit

    驱动器

    本站整理 . 2009-04-27 695

  • Migrating from the MAX7219 and

    Abstract: This applicaTIon note discusses the similariTIes and differences, both hardware and software, between the older MAX7219 and MAX7221 LED display drivers and the newer MAX6950 and MAX6951 driv

    MAX7219

    本站整理 . 2009-04-27 600

  • Charlieplexing - Reduced Pin-C

    Abstract: This applicaTIon note discusses "Charlieplexing" -- a pin-count reducing mulTIplex technique used by the MAX6950, MAX6951, MAX6954, MAX6955, MAX6958, and MAX6959 LED display drivers. This ap

    led

    本站整理 . 2009-04-27 630

  • 驾驶4-1/2数字仪表显示与MAX6958/59LED驱动器

    Abstract: This applicaTIon note provides details on how to connect the MAX6958 and MAX6959 LED display drivers to 5-digit LED displays for panel meter applicaTIons requiring the display range -19999 t

    驱动器

    本站整理 . 2009-04-27 680

  • 快速入门:使用MAX6954驱动7段LED显示器

    摘要:本文旨在帮助工程师快速掌握MAX6954驱动7段单色LED驱动器的使用方法。 MAX6954是一个通用显示驱动器,能够通过一个串口控制多个分立、7段、14段或16段LED显示器。本篇应用笔记介绍驱动8位单色、7段LED显示器的典型应用与配置。 有关MAX6954的详细信息请参考MAX6954的数据资料。 应用笔记"快速入门:使用MAX6954驱动16段LED显示器" 和"快速入门:使用MAX

    显示器

    本站整理 . 2009-04-27 665

  • 快速入门:使用MAX6954驱动14段LED显示器

    摘要:本文旨在帮助工程师快速掌握MAX6954驱动14段单色LED显示器的使用方法。 MAX6954是一个通用显示驱动器,能够通过一个串口控制多个分立、7段、14段或16段LED显示器。本篇应用笔记介绍驱动8位单色、14段LED显示器的典型应用与配置。 有关MAX6954的详细信息请参考MAX6954的数据资料。 应用笔记"快速入门:使用MAX6954驱动7段LED显示器"和"快速入门:使用MAX

    显示器

    本站整理 . 2009-04-27 625

  • 快速入门:使用MAX6954驱动16段LED显示器

    摘要:本文旨在帮助工程师快速掌握MAX6954驱动16段单色LED显示器的使用方法。 MAX6954是一个通用显示驱动器,能够通过一个串口控制多个分立、7段、14段或16段LED显示器。本篇应用笔记介绍驱动8位单色、16段LED显示器的典型应用与配置。 有关MAX6954的详细信息请参考MAX6954的数据资料。 应用笔记"快速入门: 使用MAX6954驱动7段LED显示器" 和"快速入门: 使用

    显示器

    本站整理 . 2009-04-27 645

  • 输出的脉宽调制集液晶/LED驱动器

    Abstract: The digital, pulse-width-modulaTIon (PWM) output available from many microprocessors is based on an internal 8- or 16-bit counter and features a programmable duty cycle. It is suitable for a

    驱动器

    本站整理 . 2009-04-27 630

  • 高电压的LED驱动器提供软件控制强度-High-Voltag

    Abstract: This circuit adapts a bias-supply IC for avalanche photodiodes (APDs) to drive a high-voltage string of LEDs, thereby providing adjustable current, software shutdown, and logic indicaTIon of

    驱动器

    本站整理 . 2009-04-27 705

  • 设计非隔离型反激LED驱动器

    摘要:本应用笔记提供了一个驱动高亮度LED的简单电路,只需很少的外围元件,并提供了线性和PWM亮度调节的功能。非常适合Osram、Lumiled、Cree和Nichia LED。 概述反激型LED驱动器比较通用,因为该结构可以用于输入电压高于或低于所要求的输出电压。此外,当反激电路工作在非连续电感电流模式时,能够保持LED电流恒定,无需额外的控制回路。本应用笔记所描述的电路基于高度集成的MAX16

    驱动器

    本站整理 . 2009-04-27 755

  • 1
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989990991992993994995996997998999100010011002100310041005100610071008100910101011101210131014101510161017101810191020102110221023102410251026102710281029103010311032103310341035103610371038103910401041104210431044104510461047104810491050105110521053105410551056105710581059106010611062106310641065106610671068106910701071107210731074107510761077107810791080108110821083108410851086108710881089109010911092109310941095109610971098109911001101110211031104110511061107110811091110111111121113111411151116111711181119112011211122112311241125112611271128112911301131113211331134113511361137113811391140114111421143114411451146114711481149115011511152115311541155115611571158115911601161116211631164116511661167116811691170117111721173117411751176117711781179118011811182118311841185118611871188118911901191119211931194119511961197119811991200120112021203120412051206120712081209121012111212121312141215121612171218121912201221122212231224122512261227122812291230123112321233123412351236123712381239124012411242124312441245124612471248124912501251125212531254125512561257125812591260126112621263126412651266126712681269127012711272