This reference design is for isolated current measurement using a shunt and isolated amplifier. By limiting the shunt voltage to 25 mV, this design is able to reduce power dissipation in the shunt and achieve a high-current measurement range of up to 200 A. Shunt voltage is further amplified by precision op amps in instrumentation amplifier-based configuration with a gain of 10 to match the input range of isolation amplifier. The output of isolation amplifier is level shifted and scaled to utilize the complete input range of 3.3-V ADC. This design uses a free-running transformer driver to generate isolated supply voltage for the high-voltage side of the circuit. Small form factor for the power supply is achieved by the operation of driver at 400 KHz.
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
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Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
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Design file that contains information on physical board layer of design PCB
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Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Shunt Based 200A Peak Current Measurement Using Isolation Amplifier Design Guide (Rev. A) | Mar. 05, 2016 |
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