1756-OF8H
1756-OF8H过压保护电路
图2显示电流检测放大器的过压保护基本连接。当差分输入电压超过指定放大器的最大额定值时，放大器就可能会将电流拉入内部保护二极管。若输入引脚之间存在大差分电压信号，则额外的串联电阻R1和R2可防止大电流流入内部保护二极管。
图2. 基本过压保护电路
保护电路能够承受的最大额定电压和最大输入电流随器件而不同。一般经验法则是，流过内部差分保护二极管的电流应以3 mA为限，除非规格书指明可接受更大的电流值。将该值代入以下等式，计算R1和R2的值：
其中：VIN_MAX是预计最大差分电压。VRATED_MAX是最大额定电压(0.7 V)。R是总串联电阻(R1 + R2)。例如，假设预计最大瞬态输入电压为10 V，则等式为：
1756-OF8H
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