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LDO current regulator for power LED Challenge You've got a power LED? Great! Build a flash light! What does the spec say? "Voltage: 3.6 .. 3.8 V, power 3 W." Okay. This means that it draws some 800 mA. Three mignon cells give 4.5 V for at least…
转自蜗窝科技:http://www.wowotech.net/pm_subsystem/regulator_framework_overview.html 1. 前言 Regulator,中文名翻译为“稳定器”,在电子工程中,是voltage regulator(稳压器)或者current regulator(稳流器)的简称,指可以自动维持恒定电压(或电流)的装置. voltage regulator最早应用于功放电路中,主要用于滤除电源纹波(100或者120Hz)和噪声,以及避免“输出电压随负…
http://www.planetanalog.com/author.asp?section_id=3041&doc_id=563055 Jonathan Harris, Product Applications Engineer, Analog Devices, 6/2/2014 As I thought about where to go with the next blog, I looked over the comments and questions from my previous…
本文作为一个提纲挈领的介绍性文档,后面会以此展开,逐渐丰富. 1. 前言 在 <开发流程>中介绍了PM开发的一般流程,重点是好的模型.简单有效的接口参数.可量化的测试环境以及可独性强的输出. 内核中功耗开发无论是新模型开发还是已有模型的调优,都需要了解现有的框架,遵循已有框架,简单有效的修改.这就需要了解<Android/Linux内核Power Management知识点>,关于Linux省电,从开机-->运行-->suspend-->关机这四种状态,开机/关机…
前言 1.  什么是regulator?      regulator翻译为"调节器",分为voltage regulator(电压调节器)和current(电流调节器).一般电源管理芯片(Power Management IC)中会包含一个甚至多个regulator.   2.  regulator有什么作用?     通常的作用是给电子设备供电.大多数regulator可以启用(enable)和禁用(disable)其输出,同时也可以控制其输出电压(voltage)和电流(curr…
Current Sourcing and Sinking Current sourcing and sinking is often mentioned in relation to electronics, digital systems and microcontrollers, but what is current sourcing and what is current sinking? Current sourcing and sinking refers to the way th…
概念:Regulator : 电源芯片, 比如电压转换芯片Consumer : 消费者,使用电源的部件, Regulator是给Consumer供电的machine : 单板,上面焊接有Regulator和ConsumerConstraints : 约束, 比如某个电源管理芯片输出的电压范围Supply : 提供电源的部件, Regulator就是一个Supply; Regulator A可以给Regulator B供电, 那么Regulator B的Supply就是A regulator 电源…
Transmit Spectrum Mask Specification – 802.11b SpecificationFor 802.11b 18.4.7.3The transmitted spectral products shall be less than –30dBc for fc-22MHz < f < fc-11MHz, fc+11MHz < f < fc+22MHz, -50dBc for f < fc-22MHz, and f > fc+22MHz,…
一.sdhci core说明 1.sdhci说明 具体参考<host(第一章)--概述> SDHC:Secure Digital(SD) Host Controller,是指一套sd host控制器的设计标准,其寄存器偏移以及意义都有一定的规范,并且提供了对应的驱动程序,方便vendor进行host controller的开发. vendor按照这套标准设计host controller之后,可以直接使用sdhci driver来实现host controller的使用,(qcom和samsu…
原文网址:http://www.cnblogs.com/kulin/archive/2013/01/04/linux-core.html Linux内核裁减 (1)安装新内核: i)将新内核copy到/usr/src下, #tar xzvf linux-2.6.38.4.tar.gz -----解压缩. ii) 将名为linux的符号链接删掉,这是旧版本内核的符号链接. #ln -s linux-2.6.38.4 linux ------建立linux-2.6.38.4的符号链接linux. (…