SH47DRN90S4/IS

工業(yè)系統(tǒng)中經(jīng)常使用到低壓側(cè)電流傳感和傳感器接口。由于與這些電路相關(guān)的差分信號(hào)非常小，因此設(shè)計(jì)人員需要高精度的運(yùn)算放大器。

圖 1 為用于檢測過流情況的低壓側(cè)電流傳感電路，該電路常用于反饋控制。圖中一個(gè)低阻值檢測電阻器（<100 毫歐 (mΩ)）與對地負(fù)載串聯(lián)。該電阻器的低阻值可以減少功率損耗和發(fā)熱，但也會(huì)相應(yīng)導(dǎo)致小壓降。精密零漂移運(yùn)算放大器可以用來放大檢測電阻上的壓降，增益由外部電阻 R1、R2、R3 和 R4 設(shè)定（其中 R1=R2、R3=R4）。高精度需要精密電阻器，設(shè)置增益是為了利用模數(shù)轉(zhuǎn)換器 (ADC) 的滿量程以獲得高的分辨率。

SH47DRN90S4/IS 

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