DRV5053: AC Current sensing 0 to 50A

Yes, and here is a reference design: http://www.ti.com/tool/TIDA-00218

The max current sensed depends on the flux concentrator used, the air gap, and the distance to the wire.

The DRV411 is more specifically targeted at current sensing, and can give much higher accuracy and bandwidth.

Best regards,
RE

Thanks for your prompt reply.

As u said , if i use flux concentrator and other guidelines, can i use DRV5053 to measure upto 50A AC current? Will DRV411 will also support upto 50A? do we need to follow any precautions for high current sensing?
As the reference design posted in TI states " Maximum measured error less than 5% from 1-A to 10-A rms", i have doubted that is it only for max error % or current range. As the design document/datasheet has no info about max sensing range, i have posted this query.

There's actually an easy way to achieve more current range in that reference design.  The DRV5053VA was used, which has 90mV/mT typical gain.  The other device versions produce lower gain, and the output won't saturate until more flux density is applied.

I reached out to the DRV411 expert, and he should be replying soon.

Best regards,
RE

Hello Muthukumar,

The DRV411 and the DRV421 can measure above 50A.  Both require cores with windings which will determine the measurement range.  Both of these devices are closed loop systems that require the winding and core to complete the loop.    Both have reference designs in the range you are looking for.

DRV411 Reference designs:
±50A Current Sensor using Closed-Loop Compensated Hall Element Reference Design
100A Closed-Loop Current Sensor Reference Design using Bi-Polar Supplies

DRV421 Reference designs:
Fluxgate Magnetic Current Sensing Reference Design with High Linearity for 3–Phase Inverters (50A)
±15A Current Sensor using Closed-Loop Compensated Fluxgate Sensor Reference Design

The DRV421 magnetic core is more involved and we have a system parameter tool to help with the design and other application notes found here.

Each of these devices (DRV421 and DRV411) have their tradeoffs(cost, design time) but both require a magnetic core design.

Please let me know if you have any specific questions.

Regards,

Javier