[原创] Maxim MAX40056带PWM抑制双向电流检测放大器解决方案

Maxim公司的MAX40056是带PWM抑制双向电流检测放大器(CSA),输入共模范围从-0.1V到65V,负电感跳变电压保护到-5V.因此,CSA非常适合于电感负载的相电流检测如马达和螺线管,这些设备的PWM用来控制驱动电压和电流.MAX40056采用改进技术有助抑制共模模式输入PWM边沿,其转换速率高达或超过±500V/μs,共模抑制比(CMRR)典型值为60dB (50V,±500V/μs,输入)和140dB DC.-3dB带宽为300kHz,多个增益可选择:10V/V, 20V/V和50V/V,内部双向失调为1%基准电压,典型输入失调电压为5μV,轨到轨输出,单电源工作电压+2.7V到+5.5V,工作温度-40℃到+125℃,主要用在PWM H桥马达电流检测,螺线管电流检测,电感负载电流检测,电池组监视器和汽车电子.本文介绍了MAX40056主要优势和特性,简化框图,内部ESD箝位架构图,多种应用电路以及评估板MAX40056 EVK主要特性,电路图,材料清单和PCB设计图.

The MAX40056 is a bidirectional current-sense amplifierwith an input common-mode range that extends from-0.1V to +65V together with protection against negative inductive kickback voltages to -5V. This CSA is well-suitedfor phase current monitoring of inductive loads, such asmotors and solenoids, where pulse width modulation isused to control the drive voltage and current. TheMAX40056 uses an improved technique to help reject common-mode input PWM edges with slew rates up toand beyond ±500V/μs. Common mode rejection ratio(CMRR) is typically 60dB (50V, ±500V/μs input) and140dB DC, typical.
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