• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 29 subscribers
  • Views 168 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8702-Q1: Wrong VIO when calculating chopping current on spec

Alvin Zheng
Intellectual 900 points
Part Number: DRV8702-Q1

Hello, Team

Customer reported a wrong VIO refer when calculating chopping current on spec. Please check.

In DRV8702-Q1 datasheet, The VIO is listed as typically 5mV in the table below.

While in the Equation 1 in page 24, it was assumed as 50mV. Could you share with me how it was assumed? I am confused about it. Thanks!

 

  • 0
    TI__Guru** 114905 points

    Hi Alvin,

    The paragraph after Equation 1 has a typo.

    For example, if a 50-mΩ sense resistor and a VREF value of 3.3 V are selected, the full-scale chopping current is 3.28 A. The AV is 19.8 V/V and VIO is assumed to be 50 mV in this example.

    The 50mV should be 5mV, which is the Input-referred offset only.

    50mV would be (VIO * AV)