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Mathcad Calculates Input Capac
Abstract: Step-down buck regulators are extremely popular in a variety of portable and non-portable equipment. These buck converters are terminated with an input capacitor, CIN and an output capacitor, CO, at the output. CIN provides high-...
2009-04-29 1443
获取电量计应用中的锂电池特性
摘要：精确的电池电量计量应建立在对在不同工作环境和条件下的电池各种特性的充分了解的基础上。要获取这些信息，应该在已知的条件下准确测试电池的各种特性。本应用笔记...
2009-04-29 1001
选择最佳的电压基准源
摘要：电压基准源简单、稳定的基准电压，作为电路设计的一个关键因素，电压基准源的选择需要考虑多方面的问题并作出折衷。本文讨论了不同类型的电压基准源以及它们的关键...
2009-04-29 596
电源内阻：扼杀DC-DC转换效率的元凶
摘要：DC-DC转换器常用于采用电池供电的便携式及其它高效系统，在对电源电压进行升压、降压或反相时，其效率高于95%。电源内阻是限制效率的一个重要因素。本文描述了电源内阻...
2009-04-29 607
电池的合理选择
摘要：最终用户是否满意其便携式设备的设计，很大程度上取决于电池的性能。 电池的关键指标当然是电池的使用寿命。从表面上看，这只是一个简单的规格，但它却涉及到了...
2009-04-29 467
上电复位与相关监控功能
摘要：本文讨论用于单电源或双电源处理器的上电复位功能和门限电压的选择策略，另外，还探讨了手动复位、电源失效和低电压检测等功能。文中阐述了避免使用分立POR和处理器...
2009-04-29 869
电流检测集成电路阻止过损伤-Current-Sense IC
Abstract: This application note describes the use of a current-sense amplifier to monitor the load current of a circuit supply voltage. When the current being drawn from the supply exceeds the predetermined level, an external pass transist...
2009-04-29 841
Overcurrent Monitor Operates u
Abstract: Using a current-sense amplifier, a high-side MOSFET driver, and a latching voltage monitor a circuit can be easily constructed that protects from overcurrent conditions and operates at voltages as high as 26V. W...
2009-04-29 590
断路器处理电压76V-Circuit Breaker Han
Abstract: A current-sense amplifier, comparator, external CMOS switch, and an external transistor can be used to create a circuit breaker. The simplicity of low-side current monitoring can mask the advantages of a high-si...
2009-04-29 918
超载保护电路电池和电源-Overload Circuitry
Abstract: A combination of current-sense amplifier, dual-comparator and external CMOS switches can be used to prevent the damaging effects of a reversed-polarity battery or short-circuit load. The most widely used device ...
2009-04-29 917
Snubber Circuits Suppress Volt
Abstract: The flyback dc-dc converter topology results in significant cost and space savings for multiple output power supplies with high output voltage for power levels up to 100W. Flyback topologies store and transfer energy using a tran...
2009-04-29 2241
高侧电流检测的测量：集成电路和原则-High-Side Cu
Abstract: This application note describes the use of current sense amplifiers, differential amplifiers and instrumentation amplifiers to measure battery charge and discharge currents in portable equipment, computer notebooks and USB access...
2009-04-29 1366
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...
2009-04-29 1289
Add Fault Protection to 4-20mA
Abstract: This circuit provides flexible fault protection for a 4-20mA current loop. In addition, it includes circuitry for recovering digital signals (such as the HART protocol) imposed on the loop. 4-20mA current loops ...
2009-04-29 1524
One Button Turns Microprocesso
Abstract: Combining a low-dropout (LDO) linear regulator with an OR gate produces a circuit that allows a single pushbutton to turn a microprocessor-based portable system on and off. When placing a microprocessor-based po...
2009-04-29 1010
电源备份开关-Power-Backup Switch
Abstract: A microprocessor-supervisor IC and two external MOSFET switches form a low-voltage backup power supply that can provide several amperes when the main supply fails. Every subsystem in an electronic product depend...
2009-04-29 1198
DS1870采用外接电阻时的调节范围/分辨率
摘要：DS1870用于射频(RF)功率放大器偏置控制，如果不接外部电阻，采用5V基准，其偏置电压范围为3V至5V。本应用笔记旨在展示如何利用外接电阻达到适当的范围和分辨率。可以利用...
2009-04-28 624
利用DS4303为LDMOS RF功率放大器提供偏置
摘要：LDMOS RF功率放大器因其极高的性价比在GSM和CDMA基站市场占据了主导地位。使用LDMOS放大器时，保证高性能的一个关键因素是补偿栅极偏置电压，以在温度变化时保持恒定的静态...
2009-04-28 772
数字可调电压基准源-Digitally Adjustable
A digitally adjustable voltage reference is useful in many applications. For instance, it can be used to finely tune the reference voltage when absolute accuracy is required or to adjust the reference voltage to match the full-scale voltag...
2009-04-28 1994
在便携式应用中数字调整的DC-DC转换器输出电压
There are many portable applications that optimize circuit performance by adjusting the output voltage of a DC-DC converter. For instance, many microprocessors can operate at a low voltage to save power, and then operate at a high voltage ...
2009-04-28 1221
利用数字电位器的调节降压DC-DC转换器设计-Using D
Abstract: This application note describes how to use a digital potentiometer to generate an adjustable voltage supply using a MAX1776 step-down DC-DC converter. A reference design using the DS3903 is shown that features the ability to prod...
2009-04-28 2097
利用DS1841对数电阻优化雪崩光电二极管(APD)的偏置范
摘要：本文阐述了如何使用DS1841对数电位器调节APD偏置电路的输出范围。为了使调节过程更简单，本文还提供了电子数据表。 APD偏置电路DS1841可受温度控制的...
2009-04-28 698
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). ...
2009-04-27 770
动圈式仪表措施低级电流-Moving-Coil Meter
Abstract: The MAX4172 IC substitutes a current amplifier for the shunt normally associated with a moving-coil meter. This circuit allows use of the moving-coil meter, even when the meter current is a large fraction of the current being mea...
2009-04-26 537
3V DAC在±10V中的应用
摘要：大多数现代系统中的电子器件通常采用3.3V或更低的电压供电，但有时还需提供±10V的电压驱动外部负载(工业应用中非常普遍)。尽管有些数/模转换器(DAC)能够以±10V的摆幅驱动...
2009-04-26 1971
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. ...
2009-04-25 748
4路(3路数据+1路时钟)LVDS串行器/解串器的延迟裕量测
摘要：对于MAX9209/MAX9222等多通道输入的LVDS串行/解串器，测量接收器的延迟裕量以判断它们的抖动容限是一种行之有效的方法。虽然一些文献给出了接收端的延迟定义，但还没有公认...
2009-04-25 1104
编辑推荐厂商产品技术软件/工具OS/语言教程专题
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