高侧电流传感器显示正负电源-High-Side Positi
abstract: this application note uses a high-side current-sense amplifier to monitor the current from a negative supply voltage. the circuit uses the ic's wide common-mode input range to amplify a small vsense signal at the negative supply and level shift it up to a positive output voltage.
all dedicated current-sense amplifiers are designed for high-side sensing on a positive supply, but you can adapt them to monitor a negative supply (figure 1). the positive supply pin (v+) connects to the system's positive supply, and the ground pin (gnd) connects to the negative supply (vee). that arrangement monitors the negative supply while providing a positive output voltage for the external interface (typically an a/d converter). the rs+ pin of the current-sense amplifier (u1) connects to the load, and the rs- pin connects to the negative supply.
figure 1. connecting this positive-supply-current monitor (u1) as shown lets it monitor a negative current while generating a positive output voltage for the adc.
u1's current-source output drives a current that is proportional to load current flowing to ground (not to the gnd pin). output resistor ro converts the current to a voltage, which is then digitized by an adc (optional):
the maximum output voltage is limited by saturation in the internal transistors (which occurs at approximately v+ -1.2v). thus, v+ must exceed the full-scale output by at least 1.2v. if, for instance, the full-scale output is 1v, then v+ ≥ +2.2v. to meet the device's maximum and minimum operating voltages, 0 ≥ vee ≥ -(32 - v+) and (v+ - vee) ≥ +3v. figure 2 shows the variation of current-measurement accuracy with load current.
figure 2. the figure 1 current-sensing error varies with load current as shown.
不同晶体管的优缺点
目前思必驰已经有明确的上市计划，首选国内资本市场
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高侧电流传感器显示正负电源-High-Side Positi
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51Talk获得新专利，虚拟现实外语学习即将到来
all dedicated current-sense amplifiers are designed for high-side sensing on a positive supply, but you can adapt them to monitor a negative supply (figure 1). the positive supply pin (v+) connects to the system's positive supply, and the ground pin (gnd) connects to the negative supply (vee). that arrangement monitors the negative supply while providing a positive output voltage for the external interface (typically an a/d converter). the rs+ pin of the current-sense amplifier (u1) connects to the load, and the rs- pin connects to the negative supply.
figure 1. connecting this positive-supply-current monitor (u1) as shown lets it monitor a negative current while generating a positive output voltage for the adc.
u1's current-source output drives a current that is proportional to load current flowing to ground (not to the gnd pin). output resistor ro converts the current to a voltage, which is then digitized by an adc (optional):
the maximum output voltage is limited by saturation in the internal transistors (which occurs at approximately v+ -1.2v). thus, v+ must exceed the full-scale output by at least 1.2v. if, for instance, the full-scale output is 1v, then v+ ≥ +2.2v. to meet the device's maximum and minimum operating voltages, 0 ≥ vee ≥ -(32 - v+) and (v+ - vee) ≥ +3v. figure 2 shows the variation of current-measurement accuracy with load current.
figure 2. the figure 1 current-sensing error varies with load current as shown.
不同晶体管的优缺点
目前思必驰已经有明确的上市计划，首选国内资本市场
应用机器视觉系统进行导航机器人的设计
YCR单向可控硅系列
物联网技术正在加速推动着零售行业转型升级
高侧电流传感器显示正负电源-High-Side Positi
fireflyFace-RK3399主板I2C控制器介绍
车载芯片的发展趋势是什么？GPU和ASIC的发展方向与应用的概述
预计爱立信年底全球5G用户数达1.9亿，到2025年底将达到28亿
高频/射频信号及视频压缩编码的基本概念
莱姆电子携新品再现CIGEE德维斯智电展
Cypress全新West Bridge控制器支持USB 3.0
当无人驾驶汽车闯了红灯 谁该买单？
脚本语言和编程语言的区别
VR将成为数字化工业重要环节
Overstock旗下区块链风投子公司Medic即将推出首个加密代币交易平台
业界要闻：奥士康上半年营收1亿元、和舰A股挂牌、印度通膨5月创新高
德媒：中国今年卫星发射已达20次打破历史纪录
信利光电在上市大考前夕突遇变数
51Talk获得新专利，虚拟现实外语学习即将到来