• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 47 subscribers
  • Views 210 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

LMV951: constant-current source circuit OPA solution check

Bo Xian Yeh
Intellectual 1425 points
Part Number: LMV951


Tool/software:

Hi Expert,

Customer would like to design a constant-current source circuit with 1V / 10A.

For OPA, Does LMV951 can support 1V input voltage?

If there is any better device, please also suggest. Thanks.

  • 0
    TI__Guru**** 167546 points

    Hello Bo,

    The supply voltage is 12V and LMV951 is one our lowest voltage range op amps. So that won't work. Offset voltage can be as high as 3mV, that's a 300mA output current error. Kelvin connection on both sides of R3 is needed. Therefore U1 needs a difference amplifier setup. What is the voltage at IN? Q2 can get incredibly hot.

    I think we should start over. What is the load at "IN"? I think a switching current driver will be a better solution.