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LM4041C: build a constant current source with LM4041c

Wayne Wang20
Expert 4360 points
Part Number: LM4041C
Other Parts Discussed in Thread: TL431, LM4041-N

Hi team,

My customer wants to build a constant current source with LM4041C. The current will go into a PT100 to sense the temperature. I noticed in our TL431 datasheet, we have a constant current sink example as below picture. But the structure of LM4041C is different from TL431 and customer wants a current source instead of a current sink. So could you please help design a constant current source circuit with LM4041C? Thanks.

Best regards,

Wayne

  • 0
    TI__Mastermind 19550 points
    Hi Wayne,

    Is this the adjustable version (ADJ) version of the LM4041C?
    If so then figure 26 on the LM4041-N datasheet shows a current source configuration.
    www.ti.com/.../lm4041-n-q1.pdf

    We have 2 version of the LM4041.
    LM4041: TI designed version
    LM4041-N: Acquired from the national acquisition.

    If this is the fixed version then we have to make a separate schematic that will be less accurate than the ADJ.

    -Marcoo