This reference design is a low-side, bidirectional current shunt monitor using high-speed amplifiers. It is intended for applications that could benefit from faster fault detection, single shunt motor control, higher switching frequencies, higher gain, and or reduced general ADC sampling noise. This design featuresthe OPA365-Q1, OPA2836-Q1, and OPA607 in 10 V/ V of gain to monitor a 1-mΩ shunt.The default configuration is for ≤45-A systems, and accurately senses transients up to ±50x Vcc, for a Vcc range of 2.2 V to 5.5 V. The default configuration achieves <250 ns settling time for the typical acquisition period of the 3.3-V, 12-bit internal ADC of most TI motor microcontrollers. This design guide will review necessary considerations for fast and accurate current sensing, and for system safety and efficiency.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | High-Speed Low-Side Current Sense Reference Design (Rev. C) | PDF | HTML | Aug. 23, 2022 |
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