TLV9062: How to improve current sensing accuracy?

George Zhao

Part Number: TLV9062

Hi team,

My customer is using TLV9062 for current measurement at PFC stage. Schematic shown as below.

Customer only have 1% resistors. How to evaluate or calculate the total measurement accuracy?

Apart from using higher accuracy resistors and a better amplifier, what other ways do we have to improve the system accuracy?

Thank you very much!

George

over 4 years ago

0 Tim Claycomb over 4 years ago

TI__Genius 15410 points

Hi George,

Please take a look at "±1A Single-Supply Low-Side Current Sensing Solution Reference Design". The appendix at the end of the document shows a step by step error analysis for the circuit you are showing.

Other ways to improve the circuit performance is ensure the PCB layout is optimized for low side current sensing. Please take a look at the below technical articles.

How to lay out a PCB for high performance, low side current sensing

The Basics: How to layout a PCB for an op amp

Thank you,

Tim Claycomb

0 George Zhao over 4 years ago in reply to Tim Claycomb

TI__Intellectual 1635 points

Thanks Tim, this helps.

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TLV9062: How to improve current sensing accuracy?