电源设计应用
DAC and Op Amp Generate Variab
Abstract: This design idea describes a simple circuit to generate a programmable negative control voltage. It takes the output of a single supply digital-to-analog converter (DAC) and produces a variable negative voltage. The DAC output fr...
2009-05-07 2247
Rail-to-Rail Outputs and Beyon
Abstract: When does the input voltage range of a low power/low voltage op amp become important? What operational amplifier should you choose when designing a battery powered handheld system? To optimize performance in tod...
2009-05-07 2787
监测一小步变化的直流电压-Monitoring a Smal
Abstract: Simple level shifting circuit using a precision op amp tracks small DC voltage changes. When we want to capture a low level, long duration signal riding on a much higher DC level, we need to have adequate resolu...
2009-05-07 1239
审议“ Deboo ”单电源集成-Consider the
Abstract: The "Deboo" Integrator simplifies the use of single-supplies by ground-referencing both the input and the output. The design of standard inverting integrators is simple when bipolar supplies are available, but i...
2009-05-07 844
Negative Resistor Cancels Op A
Abstract: Canceling the load allows the op amp the capability for high output current while maintaining all the other high-accuracy specifications such as very high open-loop gain, low offset voltage and current, low offset-voltage and off...
2009-05-07 1350
交点分析运算放大器电路-Nodal Analysis of
Abstract: The creation of the op amp introduced a new fundamental component and marked a change in thinking for analog designers. Since it is so widely used, pretty much any op amp circuit that an engineer needs to implement has already be...
2009-05-07 752
三运放架构对仪表放大器的制约
摘要：一直以来，三运放仪表放大器作为工业标准被用于那些要求高增益和/或高CMRR的精密应用场合。然而，当此类放大器工作在当前绝大多数应用所要求的单电源供电系统时，存在...
2009-05-07 1973
带有输入串联电阻的电流检测放大器的性能
摘要：本篇应用笔记阐述了高边电流检测放大器的性能特性。本文论述了在放大器的检测输入端如何使用串联电阻。该设计方法特别适用于需要对高压线路上检测电阻两端的小信号...
2009-05-07 789
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...
2009-05-07 2468
采用简单的稳压电路为高边电流监测器提供恒定电压
摘要：在典型的光电二极管电流监测应用中，电流监测器和雪崩光电二极管(APD)之间的压降随温度和电流而变化，由此改变了总增益。本应用笔记介绍了一种利用稳压电路保持电流检...
2009-05-07 791
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...
2009-05-07 804
特种氩弧焊机电源的实现
讨论了一种用于氩弧焊机的电源系统。该系统解决了现有焊接电源存在的引弧困难、电流控制精度低等问题；电源随工控机控制的给定焊接电流参数而变化，提高了设备的自动化程...
2009-05-06 3424
Autozero Noise Filtering Impro
Abstract: This article shows a simple technique to reduce the output noise of an autozero, indirect current-feedback instrumentation amplifier. The MAX4209 instrumentation amplifier serves as design example. A similar art...
2009-05-06 1159
High-Side Current-Sense Amplif
Abstract: This circuit modifies a standard 32V high-side current monitor to measure load current (to 30mA) while accommodating any level of high voltage, subject to limitations in the external components. (The components shown allow measur...
2009-05-06 2033
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...
2009-05-06 1006
电流限制电路的降压稳压器-Current-Limit Cir
Abstract: This article demonstrates how to achieve current limit for the MAX1692 PWM step-down regulator by using a MAX4173H current-sense amplifier. Additional Information: Quick View Data Sheet for the MAX16...
2009-05-06 1248
High-Accuracy Current-Sense Am
Abstract: Current sharing between DC/DC converter modules enables several modules to be paralleled. In recent years, tight tolerances for current sharing have made discrete current-sense circuit designs a formidable challenge. This applica...
2009-05-06 1464
高侧电流传感器输出周期-High-Side Current
Abstract: The MAX4374 high-side current sense amplifier with two internal comparators is used to produce a pulse-width output signal proportional to the current being sensed. This simple circuit eliminates the need for a discrete A/D conve...
2009-05-06 1336
Practical Data Acquisition usi
Abstract: This application note describes the design of a PC-based, 14-bit data acquisition system. It takes a system approach, includes all the necessary building blocks: analog, digital, hardware, and software. It discusses each step, te...
2009-05-06 1459
混合电路驱动器的类型和数量的LED-Circuit Driv
Portable systems often use LEDs of different colors-white for the display backlight, green for keypad illumination, red for power, etc., and in varying quantities of each. Typically the LEDs are driven by at least two power supplies, one f...
2009-05-06 905
用两个单向电流检测放大器组成一个双向电流检测放大器
摘要：许多电池电流监测应用中需要双向电流检测功能，以测量电池的充电和放电电流。本文介绍了怎样用两个单向电流检测放大器，比如MAX4172和MAX4173，组成一个双向电流检测放大...
2009-05-06 2917
简单的、输出锁定的过流故障检测器，具有快速的响应时间
摘要：本文介绍了一个简单、具有快速响应时间的过流故障检测器，用于低压系统的电路保护。该方案与专用的热插拔控制器不同，专用的热插拔控制器跳出欠压状态后往往具有较...
2009-05-06 1217
带有输入串联电阻的电流检测放大器的性能
摘要：本篇应用笔记阐述了高边电流检测放大器的性能特性。本文论述了在放大器的检测输入端如何使用串联电阻。该设计方法特别适用于需要对高压线路上检测电阻两端的小信号...
2009-05-06 1003
采用简单的稳压电路为高边电流监测器提供恒定电压
摘要：在典型的光电二极管电流监测应用中，电流监测器和雪崩光电二极管(APD)之间的压降随温度和电流而变化，由此改变了总增益。本应用笔记介绍了一种利用稳压电路保持电流检...
2009-05-06 735
电路简单双打输入频率-Simple Circuit Doub
Abstract: A simple circuit consisting of a comparator and an exclusive-OR gate is sufficient to double the frequency of a reference signal. The versatile phase-locked loop (PLL) allows multiplication of a reference freque...
2009-05-06 1522
阅读隔离数字国家的电力消耗-Read Isolated Di
Abstract: A simple circuit employs a small transformer and latched comparator to sense the state of a digital line without drawing power from the line. Electronic systems must often isolate their inputs or outputs from th...
2009-05-06 727
pFET线性稳压低压差-pFET Linear Regula
P-channel MOSFETs (pFETs), though more expensive than pnp transistors, are free of the dissipation loss associated with base drive in a pnp circuit. pFETs also have a lower saturation voltage at light loads (Figure 1). In fact, the low RDS...
2009-05-06 1660
升压转换器具有较高的轻负载效率-Boost Converte
In most DC-DC converters, the normal supply currents do not allow high efficiency at low load currents. The circuit in Figure 1, however, contains micropower components that enable it to maintain 90% efficiency for load currents as low as ...
2009-05-06 1095
EPOT应用：偏移调整的运算放大器电路-EPOT Appli
Abstract: In some electronic systems, a DC offset voltage at the inputs will contribute a significant error to the output. This is especially true in high gain configurations. An offset adjustment circuit can be added to "null" out the off...
2009-05-06 997
EPOT应用：增益调整的运算放大器电路-EPOT Appli
Variable gain amplifiers often use a mechanical potentiometer to set the gain. An example is a volume control dial. However, when the analog signal path is digitally controlled, a digital potentiometer might be used to control gain. This a...
2009-05-06 649
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