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50瓦特内部总线结构(IBA)电源
摘要：本文讨论一个12V/50W的总线转换器，它从48V总线转换得到一个稳定、高效、隔离的12V输出。用到的拓扑结构是带同步整流的单开关正激转换器。在此设计中MAX5003为PWM控制器，经...
2009-05-07 899
用于ADSL2+芯片组的2.2MHz降压或升压变换电源
摘要：本应用笔记介绍了MAX5072 DC-DC变换器―专为解决ADSL2+调制解调器的电源管理问题而设计的器件。还提供了有关升压、降压或升-降压变换器的设计指南，并给出了经过验证的电路...
2009-05-07 1062
建立比较器的外部滞回电压
摘要：长期以来, 模拟比较器的使用一直处在它的“同伴”――运算放大器的阴影之中。设计人员发表了大量针对运算放大器的应用笔记, 而关于比较器的应用笔记较少。正是由于缺...
2009-05-07 2650
新增高电压能力的MAX471/MAX472高侧电流检测放大器
Abstract: An avalanche diode and current source provide a floating power supply to allow high-side current sense amplifiers to work at up to 300V. The MAX471 and MAX472 are complete bi-directional high-side current sense ...
2009-05-06 1755
精密监视负电源电流的电路
摘要：该电流检测电路监视负电源，并提供一个正比于负载电流的正输出电压。 在一个高可靠系统中，电源电流监视通常是一项必备功能，因为电流过大会给系统造成...
2009-05-06 1526
高可靠性系统中电流检测的实际考虑
摘要：电流检测最简单的方法是依据欧姆定律：电阻两端的压降和流过电阻的电流成正比。本文讨论了基于电阻的电流检测在实际设计中的问题，列举了一些典型实例，如：电流保...
2009-05-06 474
Extend Current-Sense Amplifier
Abstract: Adding a charge pump provides ±5V supply rails to the operational amplifier internal to a high-side current-sense amplifier. This modification enables that amplifier to sense currents down to 0V common-mode inputs. The circuit c...
2009-05-06 1357
利用0至1V模拟乘法器实现电池供电系统的精确功率管理
摘要：有些系统要求测量输出到负载的功率，这比通过传统的电流检测放大器简单测量电流更为重要。负载功率测量可以精确管理电池或交流适配器供电设备的功率。该应用笔记显...
2009-05-06 1442
利用精密仪表放大器实现负压电流检测
摘要：ISDN、电信等系统需要一个负压电流检测放大器。本应用笔记介绍了一种设计负压电流检测放大器的方法。这种方法非常灵活，经过简单修改即可用于不同的负压电流检测。本...
2009-05-06 936
模拟乘法器提高高边电流检测的测量精度
摘要：将模拟乘法器和高边电流检测放大器相结合，能够在笔记本电脑或其它便携仪器中实现电池充、放电电流的测量。本文讨论将模/数转换器(ADC)的基准电压加到模拟乘法器的一...
2009-05-06 600
Light Is On When Power Is Out
Abstract: A loss of AC power during darkness (sensed by a photoresistor) turns on an array of battery-powered white LEDs. To conserve power, a timer turns off the LEDs after a particular period of time (for example, 10 minutes). ...
2009-05-06 952
建立比较器的外部滞回电压
摘要：长期以来, 模拟比较器的使用一直处在它的“同伴”――运算放大器的阴影之中。设计人员发表了大量针对运算放大器的应用笔记, 而关于比较器的应用笔记较少。正是由于缺...
2009-05-06 873
微电路的正电源电流监视器-Micropower Circui
Abstract: The following application note shows a circuit that converts the load current of a positive power supply into a ground referenced signal voltage using the ICL7612 operational amplifier. The inexpensive circuit o...
2009-05-06 875
手持给出系统柔性电路故障保护-Handy Circuit G
Abstract: When it is necessary to plug in a board into a system that is currently powered, it is critical to control the inrush current to prevent damage/system fault conditions. This application provides a simple circuit to achieve this f...
2009-05-06 995
硅双极宽带锁相环积木块集成电路-A Silicon Bipo
Abstract: A broadband phase-lock loop (PLL) building block integrated circuit (IC) that can accommodate signal frequencies from 0.5GHz to 9GHz is presented. The design integrates a prescaler with selectable divide ratio, a phase detector, ...
2009-05-06 873
创建非线性传递函数与线性电位器电路-Creating Non
Abstract: Linear digital potentiometers (pots) can be used in non-linear applications such as adjusting volume control in audio applications. This article discusses how to create a "pseudo-logarithmic" taper digital pot by simply adding a ...
2009-05-05 815
低噪声音频电源电路-Low Noise Audio Powe
Abstract: Audio application note describes a simple, compact scheme that provides a low noise, low ripple power source for use in audio amplifiers, microphones, headphone amplifiers, CODECs and other audio circuits. ...
2009-05-05 1160
利用Direc tDrive技术从3.3V单电源产生2VRM
摘要：本应用笔记将Maxim的DirectDrive技术与传统的单电源供电音频线驱动器相比较，给出了DirectDrive结构的优点，特别是在机顶盒和电缆调制解调器应用中的优势。 ...
2009-05-05 654
自动电平控制简介
摘要：自动电平控制(ALC)是一种自动控制输出给扬声器的功率的技术。ALC可防止扬声器过载并优化动态范围。本应用笔记简单介绍ALC技术，并展示了其在MAX9756/MAX9757/MAX9758立体声扬声...
2009-05-05 1764
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...
2009-05-05 1202
参数测量单元(PMU)的布线指南
摘要：本应用笔记讨论了多种措施来指导系统设计人员采用正确的布局和信号走线技术。对布线设计和元件的相关介绍将减少用户在使用PMU时的噪声，并有助于处理散热问题。 ...
2009-05-05 1227
节电模式降低继电器驱动功耗
摘要：本应用笔记讨论具有内置节电电路、能降低总功耗的继电器驱动器MAX4822/MAX4824。在典型应用中，总节电范围能达5.5%至68.5%，具体数值取决于所使用的继电器类型。节电模式还...
2009-05-05 1203
MAX9979管脚电子IC中PMU模式操作
摘要：该应用笔记结合各种模式的等效电路图介绍了MAX9979参数测量单元(PMU)最常用的四种工作模式(FVMI、FVMV、FIMI和FIMV)。关于各种功能的详细介绍和模式操作请参考MAX9979数据资料。 ...
2009-05-05 1831
简单的电路保护系统过热-Simple Circuit Pro
Abstract: Using a temperature switch and fan driver IC along with a remote diode temperature switch provides thermal protection and simple fan drive functions for a system. This 2-chip circuit provides fan control, over-t...
2009-05-04 596
多电压系统需要电源电压测序-Multiple Voltage
Abstract: The following application note discusses multiple solutions for sequencing power supplies and sequencing reset outputs. It discusses the advantage and disadvantages of using a discrete solution versus a more integrated solution. ...
2009-05-04 731
选择合适的系列电压基准源的绝对精度电压输出数模转换器设计-S
Abstract: This article provides an in depth analysis, procedure, and selection tables for selecting the optimum series voltage reference for voltage output DACs. It covers all of the important parameters such as: input supply voltage, refe...
2009-05-04 1829
Current Limited DC-DC Controll
Abstract: USB powered devices require a regulated supply. Unfortunately, the USB bus voltage can vary from 4V to 9V. Configuring the MAX668 boost controller into step-up/step-down topology can generate a current-limited regulated supply. ...
2009-05-04 1632
Proper Layout and Component Se
正确的布局和元件选择控制电磁干扰 Abstract: Understanding the physics of voltage regulator topologies is important in designing power systems for EMI and EMC compliance. In particular, the physical principl...
2009-05-04 1252
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