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INA213: Current loop using the INA213 and LM258 Question

KUO WENYUNG
Intellectual 285 points
Part Number: INA213
Other Parts Discussed in Thread: LM258, LM235

Tool/software:

Dear TIer,

I would like to design a constant current mode Buck converter and implement the current loop using the INA213 and LM258.

Could you help me review the R-C values in the circuit to ensure they are appropriate for proper operation? Thank you!

BR,

KUO

CC mode test.pdf

  • 0
    TI__Mastermind 32395 points

    Hello Cherished Engineer,

    I am looking over your question and will respond soon.

    Sincerely,

    Peter

  • 0
    TI__Mastermind 32395 points

    Hey Kuo,

    The optimal R-C (feedback pole) depends upon buck converter and the speed at which you want to correct for current overshoot. The best thing is to provide the RC at INA213 output and a feedback capacitor at LM235 so you can adjust these values during a prototype testing.

    Foe the output of INA213 you would need more isolation resistance to drive a 0.1uF capacitor, probably more than 50 Ohm in order to avoid output stability.

    Sincerely,

    Peter