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LP8860 Rsense

Kei Sato73562
Expert 2310 points

Hello,

How should the resistance of Iset calculate?

Must I use 25mohm for Rsense?

Best Regards,

Kei

 

  • 0
    TI__Prodigy 460 points

    Hello Kei,

    Kei Sato73562 said:
    How should the resistance of Iset calculate?

    Formula is on page 26 DS.

    Basically for 150mA/ch scale and DISP_CL1_CURRENT=0xFFF (max current) formula can be simplified: ILED= (24/RISET)*150, where RISET kOhms. ILED mA

    Kei Sato73562 said:
    Must I use 25mohm for Rsense?

    Not necessary, but you have to be aware BOOST_IMAX_SEL current will be scaled.

    During design time all parameter were simulated with 25 mOhms.

    Best regards,

    Vladimir