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LM56: LM56 divider resistance

Tommy Tzeng
Genius 5970 points
Part Number: LM56


Hi Sir,

may we learn from you,is this IC high active at low temperature? whether the voltage resistance in the below circuit meet the require -40~ -3 deg and OUT-1 output is high?

and -3 deg or more to start the power supply(OUT-2 output), turn off OUT-1 at 10 deg.

  • 0
    TI__Mastermind 44625 points

    Hi Tommy,

    LM56 can only sink 50uA to ground on its OUT pins. See Digital Outputs section, IOUT = 50uA under conditions. RH203 must be at least 66kohm when used with a 3.3V supply. 

    LM56's VREF output is only specified to source 50uA. See VREF Output section, Load Regulation Sourcing. Your resistor network draws 169uA. Your resistors need to be increased 3-4 times to reduce the current load on VREF.

    thanks,

    ren