Silabs Si85xx开关电源电流检测方案

Silabs 公司的Si85xx开关电源电流检测器，满刻度值为5A，10A和20A，初级串通电阻小于1.3毫欧姆，电感小于2nH，输入频率从50 kHz 到1 MHz，具有一流的噪音抑制特性，工作温度–40 到125℃，主要用在电源（AC/DC和DC/DC转换器），UPS系统，马达控制，照明设备以及工业设备。本文介绍了Si85xx主要特性，功能方框图，多种应用电路以及三种目标板电路图和相应的材料清单（BOM）。

The Si85xx products are unidirectional ac current sensors available in full-scale ranges of 5, 10, and 20 A. Si85xx products are ideal upgrades for older currentsensing technologies offering size, performance, and cost advantages over current transformers, Hall effect devices, DCR circuits, and other approaches. The Si85xx are extremely low-loss, adding less than 1.3 mohm of series resistance and less than 2 nH series inductance in the sensing path at 25℃. Current-sensing terminals are isolated from the other package pins, providing up to 5 kVRMS isolation level per safety approval ratings.

Si85xx主要特性：
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Single-chip ac current sensor
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Low loss: <1.3 mohm primary series resistance and <2 nH inductance
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Leading-edge noise suppression eliminates need for leading-edge blanking
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"Ping-Pong" output version allows one Si85xx to replace two current transformers in full-bridge designs
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