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Current Sensing Circuit Concepts and Fundamentals

2010-2011 Microchip Technology 1AN1332 INTRODUCTIONC urrent Sensing is a fundamental requirement in a widerange of electronic applications. Typical applications that benefit from Current sensinginclude: Battery life indicators and chargers Overcurrent protection and supervising circuits Current and voltage regulators DC/DC converters Ground fault detectors Linear and switch-mode power supplies Proportional solenoid control, linear or PWM Medical diagnostic equipment Handheld communications devices Automotive power electronics Motor speed controls and overload protectionThis application note focuses on the Concepts andfundamentals of Current Sensing circuits. It introducescurrent Sensing resistors, Current Sensing techniquesand describes three typical high-side Current sensingimplementations, with their advantages and disadvan-tages.

Thus, according to the MCP6H01 data sheet (DS22243), it is VCMRH = VDD– 2.3V =13.7V, VCMRL =VSS–0.3V = -0.3V. Based on Equation 2, the acceptable VCM of the Difference amplifier is from -0.5V to 27.3V. The advantages and disadvantages of Difference amplifiers include: a) Advantages:

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  Sheet, Data, Mcp6h01, Mcp6h01 data sheet

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Transcription of Current Sensing Circuit Concepts and Fundamentals