LTC6103 datasheet(13/28 Pages) AD

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LT6119-1/LT6119-2

611912f

For more information www.linear.com/LT6119-1

applicaTions inForMaTion

The low offset and corresponding large dynamic range of

theLT6119makeitmoreflexiblethanothersolutionsinthis

respect.The200µVmaximumoffsetgives68dBofdynamic

range for a sense voltage that is limited to 500mV max.

Sense Resistor Connection

Kelvin connection of the SENSEHI and SENSELO inputs

to the sense resistor should be used in all but the lowest

power applications. Solder connections and PC board

interconnections that carry high currents can cause sig-

nificant error in measurement due to their relatively large

Figure 3. LT6119-1 Typical Connection

OUTA

IOUTA

–

V+

SENSEHI

INC2

INC1

R1*

611912 F03

V–

V+

V–

LT6119-1

SENSELO

OUTC2

VLE

VPULLUP

LOAD

VSUPPLY

VSENSE

RSENSE

UNDERCURRENT

FLAG

OVERCURRENT

FLAG

RIN

–

OUTC1

*ROUT = R1 + R2 + R3

V–

V+

ISENSE =

VSENSE

RSENSE

R2*

R3*

VOUT

400mV

REFERENCE

CLC

resistances.One10mm×10mmsquaretraceof1ozcopper

is approximately 0.5mΩ. A 1mV error can be caused by as

little as 2A flowing through this small interconnect. This

will cause a 1% error for a full-scale VSENSE of 100mV. A

10A load current in the same interconnect will cause a 5%

error for the same 100mV signal. By isolating the sense

tracesfromthehighcurrentpaths,thiserrorcanbereduced

by orders of magnitude. A sense resistor with integrated

Kelvin sense terminals will give the best results. Figure 3

illustrates the recommended method for connecting the

SENSEHI and SENSELO pins to the sense resistor.

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