电源设计应用
估算涓流充电实时时钟的超级电容备份时间
摘要：Maxim实时时钟(RTC)系列产品包含了几款带涓流充电器的器件，涓流充电器可以为第二个备份电池或电容充电。电池或电容用来在VCC掉电时维持时钟工作。储存在电容内的能量需...
2009-04-21 1308
投币锂电池：寿命预测中的应用-Lithium Coin-Ce
Abstract: This application note discusses various contributors to battery capacity consumption in a battery-backed application, and how to predict battery lifetime in a system. A designer should be able to use this application note to dete...
2009-04-21 693
Problems and Solutions for Adj
Abstract: Recent U.S. legislation increased the daylight saving time (DST) period by four weeks. This change will affect systems that adjust for DST by using real-time clocks (RTCs) with an integrated DST adjustment. This note discusses is...
2009-04-21 985
DS1375 Power Line to 60Hz Cloc
Abstract: The DS1375 2-wire digital real-time clock (RTC) is a low-power, clock/calendar that can operate from a digital clock input at one of four frequencies: 32.768kHz, 8.192kHz, 60Hz, or 50Hz. This application note shows how to derive ...
2009-04-21 1215
充电电池和单机快速充电器概述
摘要：本应用笔记简单介绍了镍镉(NiCd)、镍氢(NiMH)和锂离子(Li-Ion，Li+)可充电电池, 讨论它们的性能，并说明在不需要微控制器的情况下如何构建单机结构，安全、快速地为镍氢和锂...
2009-04-21 1164
下一代视频滤波放大器，延长了手持式视频系统的电池使用时间
要：越来越多的便携式设备，例如数码相机、蜂窝电话和便携式媒体播放器等，都开始逐渐增加复合视频输出的连接功能。这类设备中，视频数/模转换器(DAC)产生复合视频信号，在...
2009-04-21 413
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...
2009-04-21 786
Keep Power Consumption in Chec
Abstract: Portable electronic devices usually include a single 3- or 4-connector jack which can be a stereo headphone jack, a mono headphone jack with microphone input and hook switch, or a stereo headphone jack with microphone/hook-switch...
2009-04-21 1135
选择高亮度LED驱动器用于汽车照明应用
Abstract: This application note provides an overview of HB LED driver selection criteria for automotive lighting applications. It reviews HB LED driver topologies and recommends configurations for various automotive lighting applications, ...
2009-04-21 495
ResourceSmart™ (Green) I
Abstract: As consumers demand environmentally friendly ("green," or ResourceSmart) electronics, design engineers must seek new design techniques, standards, and products. This application note lists links to a variety of government, indust...
2009-04-21 459
Designing a 4-20mA Current Loo
Abstract: Current-mode data transmission is the preferred technique in many environments, particularly in industrial applications. This application note describes the design of a 4-20mA current loop using the MAX1459 sensor signal conditio...
2009-04-20 2821
Buffered Linear-Ramp Generator
Abstract: A precision ramp generator produces a 0 to 5V ramp while operating from a single 5V supply. Using standard circuits and no auxiliary voltage generators, such as charge pumps or inductive DC-DC converters, it is ...
2009-04-20 1918
DS1090频率计算器
摘要：本应用笔记提供一个简单易用的频率计算器，用于确定适当的型号、偏置电阻以及DS1090低频、电阻可编程、扩频EconOscillator™的输入设置。DS1090可提供125kHz至8MHz的扩频、方...
2009-04-20 448
Analog Switches Operate With 3
Abstract: By adding a voltage doubler and voltage inverter, a single 3V or 5V power supply can produce the voltages necessary to improve the performance on a dual voltage analog switch. With the higher power supplies and wider range, the o...
2009-04-20 918
Minimizing Total Harmonic Dist
Abstract: Analog switches are commonly used in audio systems to switch low-level inputs or adjust audio filter characteristics. Selecting the proper analog switch can help optimize the total harmonic distortion (THD) of a system within the...
2009-04-20 1118
Analog Switch Lowers Relay Pow
Abstract: Design idea outlining a method to use an analog switch and discrete components to reduce the power dissipated in relay actuation. Relays are often used as electrically controlled switches. Unlike transistors, th...
2009-04-20 1654
Selectable-Range Current Loop
Abstract: This article shows an example of implementing a 4-20mA or 0-20mA current-loop output using a voltage output digital-to-analog converter (DAC) and a V to I converter. Current-loop signals, as opposed to voltage s...
2009-04-20 1040
Fault Protection Saves Multipl
Abstract: Discrete components are available to protect against faults caused when a voltage applied to the input of a switch, mux, or signal-line circuit protector exceeds the voltage at the power supply pins. A more practical approach to ...
2009-04-20 2198
Selecting the Right CMOS Analo
Abstract: This tutorial outlines the basic construction, operation, and applications of analog switches. On-resistance, flatness, and charge-injection, each a performance-related specification, are defined. Application-specific features in...
2009-04-20 1080
Multiplexer Enables Pseudomult
Abstract: A circuit is described that allows four remote RS-232 transceivers to share a single UART. A dual four-to-one multiplexer permits transceiver IC1 to form a network with the four remote transceivers. RS-232 commu...
2009-04-20 1117
High-Speed Pulse Generator Has
Abstract: As integrated circuits (ICs) speed up, the rise/fall times of most pulse and function generators (5ns typical) become inadequate for measuring time intervals below 20ns. You can overcome this limitation with analog switches or ad...
2009-04-20 1576
低电压故障保护
摘要：本应用笔记讨论过压保护在连接系统电路的开关和复用器中的必要性。MAX4711/MAX4712/MAX4713模拟开关工作在2.7V至11V，集成了故障保护功能。本文还介绍了其它几种故障保护方案...
2009-04-20 1025
Protecting Against Momentary P
Abstract: Impact or vibration can cause momentary interruptions when batteries lose contact. To ensure continuity of power in battery-powered systems, add this three-IC circuit. When you drop a battery-powered device, the...
2009-04-20 514
电池与PWM充电电源短路保护
摘要：本应用笔记提供了一个简单的蜂窝电话电池充电系统的保护方案，避免在基带处理器闭锁时损坏电池。该电路通过监视处理器和插接操作，避免电池与PWM充电电源短路。 ...
2009-04-20 1867
Using DS4510/DS4520/DS4550 to
Abstract: Many high-reliability systems maintain a backup copy of their flash memory should a new software download become unusable for any reason. This application note describes how the DS4510, DS4520, and DS4550 non-volatile I/O expande...
2009-04-20 1080
Driving White LEDs in Clamshel
Abstract: A switching-converter IC—designed as a white-LED driver—and an analog switch control three forms of LED illumination in a mobile (clamshell) phone. This circuit multiplexes the drive to three sets of LEDs fo...
2009-04-20 661
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| 直流电机 | PID | MOSFET | 传感器 | 人工智能 | 物联网 | NXP | 赛灵思 |
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| 伺服电机 | SVPWM | 光伏发电 | UPS | AR | 智能电网 | 国民技术 | Microchip |
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