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APR348

How to Simplify Synchronous Rectification

By Richard Lin, AC-DC Business Unit Manager, Diodes Inc.

With tens of billions of new devices expected to come online soon, including all the billions more that won't be connected, the need for small and efficient external power conversion continues to increase.

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Looking Beyond the Datasheet New Ways to Use Devices

Looking Beyond the Datasheet – New Ways to Use Devices

By Isaac Sibson, Diodes Incorporated

Current regulators are a basic building block that can be used wherever a circuit or device needs a steady and stable source of current. They will often be used when an unstable supply can have a negative impact. 

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Why Logic Makes Sense

Invisible Logic is What We Want to See

By Johnny Lu, PTC Marketing Director, Diodes Inc.

Widespread in use, standard logic devices are often the preferred way to conjoin parts of a circuit where reliable connections are required, or even when there’s a need to overcome a design challenge within a system.

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Blog post on smaller packages graphic

Great Things Come in Small (Outline) Packages

By Shane Timmons -  Product Marketing Manager,  Diodes Incorporated 

Gordon Moore’s prescient prediction of the ever-growing density of components on integrated circuits (ICs) continues to be proved right. Even if the recent growth is slowing down, the trend towards smaller packages continues apace.

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Diodes AP3917 image

Efficient Offline Power for Small Online Appliances

By Richard Lin, AC-DC Business Unit Manager, Diodes Incorporated.

It is widely acknowledged that, at its heart, the Internet of Things (IoT) comprises countless sensors, actuators, and other devices that add ‘intelligence’ to the connected world. For the IoT to work as intended, many of these devices must be switched on and connected 24 hours a day, seven days a week.

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Diodes Incorporateds Synchronous Buck AP6320x

Minimizing EMI in Switched-mode PSUs

By Tu Bui – Senior Marketing/Application Manager, Diodes Incorporated.

Developers of applications that feature power conversion elements, including home appliances, power tools, industrial and office equipment, will know only too well that electromagnetic interference (EMI) is largely unavoidable. However, they should also know that it can be managed, so that its effects are minimized to the point that they no longer present a problem.

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DIO 6883 AP356xQ MR image

How Hall Effect Switches Enable Autonomous Vehicles

By Charles Kuo, Sensor Marketing Manager, Diodes Incorporated.

Automotive engineers around the world are immersed in harnessing the latest technologies to bring smart, autonomous vehicles to our roads. Those technologies will also enhance the driver and passenger experience far beyond today’s norm, through intuitive human-machine interfaces and highly personalized cockpits.

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Ultra Low Power Omnipolar Hall Effect Switch DIO 6824 MR Image AH191121

Why Hall Effect Switches Play a Crucial Role in IoT

By Charles Kuo, Worldwide Sensor Marketing Manager, Diodes Incorporated.

Many words have been written about how the Internet of Things (IoT) will transform the lives of everyone. What is less often said is that at the heart of the IoT is the humble sensor, which enables previously inanimate objects to communicate with each other and to be controlled and monitored.

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High Voltage Buck Converter DIO 6566 PR Image AL17050 MR

如何让无线互联连网物联网装置的功率系统降低待机功耗并提高整合度

作者:Diodes 公司 LED 照明事业部经理 Allan Lin   全世界的家庭和工厂都在拥抱智能技术,通讯与控制系统的连网程度藉由各种无线技术而不断提升,要将便利性与效率带入每个人的生活中。进入物联网 (IoT) 的世界后,我们随时随地都能存取致动器和传感器,用更细腻的角度去检视设备状态,进而将数据传送到云端进行分析,在系统故障之前预先进行维修。例如,我们可以透过 Wi-Fi、Zigbee 或蓝牙低功耗,实时遥控 LED 灯泡,以及选择适合环境的光线色温。 所有这些智能连网装置都需要低待机功耗,这对功率系统设计人员来说是一大挑战。功率转换需在所有负载下维持高效率,包括无线收发器在收发数据封包,或致动器启动时。但是,这些动作其实不常发生,智能系统多数时间都在闲置及等待接收指令,这种「闲置负载」的待机状况对功率转换不佳的系统来说尤其浪费能源。 极大的挑战,便是开发针对各种负载范围将效率优化,拥有恒定稳定输出电压的功率转换器。但由于输出电压会随消耗电流改变,因此这可说是一项相当复杂的设计工作。   法规挑战 对这类系统的开发人员来说,还有除了功率子系统效能以外的更多挑战。全世界有许多不同的法规环境,各个不同国家/地区为了满足其待机功耗、瞬态要求和其他法规,都需要略为不同的功率系统版本。 对智能连网功率系统的开发人员来说,这项设计挑战极为复杂,另外对成本敏感的应用也同样艰难。一个能满足所有要求的设计,其成本可能相当高昂,而且能源效率也可能比针对特定国家/地区优化的装置更低。但若是针对不同地区设计个别的产品与拓扑,要管理所有不同的版本又会产生额外的成本。   高整合度 想要解决这些挑战,我们需要提高智能连网装置功率系统内芯片的整合度。透过在同一封装内整合高电压 MOSFET 开关与功率控制器,不只能满足全球所有的法规要求,还能提供功率效率,并降低待机功耗,花很少的钱就能满足设计人员所需。 例如,AL17050 降压转换器可应用于 85V AC 至 265V AC 的 AC 输入电压范围,无论身处任何地区,皆能安心使用此产品。它可产生 3....

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Pierce oscillator using CMOS inverter from Diodes Incorporated

晶体振荡器:简易、低成本且高准确度的频率来源

作者:Diodes 公司应用工程部经理 Qin Zhuang   许多电子电路都需要振荡器来同步活动或提供频率参考。 以微控制器为例,频率讯号用于控制数据来往内存的移动、指令的执行,以及外部通讯的速度。另外在无线电系统中,振荡器则提供固定频率,以供发射器与接收器进行通讯。 除了频率,还有一些与振荡器有关的重要属性。像准确度与稳定性 (以百万分之一或 ppm 指定) 对通讯协议和时间记录极为重要。对于便携设备或电池供电的应用来说,低功耗可能是关键的因素。其他需要考虑的特性还有成本,以及频率是否可调。 振荡器会使用某些谐振电路类型的反馈来产生固定频率的输出,谐振电路可作为电阻电容 (RC) 或电感电容 (LC) 网络。这些装置较为简单,且能在宽广的范围内变更频率。但从另一方面来看,这些装置无法提供许多应用所需要的准确度与稳定性。 像是石英等晶体,则因为压电效应,因此可用作谐振器。对晶体施加压力时,晶体内部会产生电压,施加电压时,晶体则会变形。将晶体搭配反馈,便可作为高准确度和稳定性的谐振器,而其自然频率则取决于晶体的大小和裁切方式。     图 1:使用 CMOS 逆变器的皮尔斯振荡器 简单的晶体振荡器 晶体本身是一种被动式组件,需搭配振荡器电路使用。晶体通常整合到需要频率讯号的装置内,例如,微控制器一般会有两个脚位,用来连接晶体和一些外部的负载电容器。这些电容器需与指定的晶体负载电容 (CL) 匹配,确保其能以正确的频率振荡。 变更负载电容器的数值,也会稍微改变振荡频率。我们可以利用电压控制型晶体振荡器 (VCXO) 达到此效果,因为这种振荡器会使用可变电容组件 (变容二极管) 调整频率。 您可用独立型装置来打造外部振荡器,像是使用晶体管或反向逻辑闸极提供放大和反馈。不过,虽然晶体厂商会提供设计指南,但想从头打造出高质量的振荡器却极为复杂。 直接使用现成的振荡器模块,通常会比较方便。振荡器模块包含晶体和振荡器电路,您唯一需要做的,就是为其提供电源。振荡器模块的准确度通常比目标装置内整合的基本电路更为出色。 但尽管晶体非常稳定,但振荡器的频率却可能因供应电压和温度影响而产生变化。要将这些影响降低,可以使用温度补偿晶体振荡器 (TCXO) 模块。TCXO 模块的内部电路可调整频率,藉此补偿温度变化的效应。模块经常也会内含整合式电压稳压器,用于降低外部供应电压变动的效应。TCXO 可达到 2ppm 以上的稳定性。 晶体振荡器提供简易、低成本且高准确度的频率来源,适用于宽广的频率范围,是许多应用类型的合适选择。若要深入了解,请参阅我们关于石英晶体振荡器技术的白皮书,或参阅 Diodes 公司产品页面。      ...

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