LTC6103 datasheet(21/28 Pages) AD

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LT6119-1/LT6119-2

611912f

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

applicaTions inForMaTion

Thedesiredtrippointsandfull-scaleanalogoutputvoltage

for the circuit in Figure 15 can be achieved as follows:

400mV

IOVER

VMAX – IMAX R1

( )

IMAX

400mV – IUNDER R1+R2

(

)

IUNDER

Trip points for the LT6119-2 can be set by replacing IUNDER

with a second overcurrent, IOVER2.

Hysteresis

Each comparator has a typical built-in hysteresis of 10mV

to simplify design, ensure stable operation in the pres-

ence of noise at the inputs, and to reject supply noise that

might be induced by state change load transients. The

hysteresis is designed such that the threshold voltage is

altered when the output is transitioning from low to high

as is shown in Figure 14.

External positive feedback circuitry can be employed

to increase the effective hysteresis if desired, but such

circuitry will have an effect on both the rising and fall-

ing input thresholds, VTH (the actual internal threshold

remains unaffected).

Figure 15 shows how to add additional hysteresis to a

noninverting comparator.

R6canbecalculatedfromtheextrahysteresisbeingadded,

VHYS(EXTRA) and the amplifier output current which you

want to cause the comparator output to trip, IUNDER. Note

that the hysteresis being added, VHYS(EXTRA),isinaddition

to the typical 10mV of built-in hysteresis.

400mV – VHYS(EXTRA)

IUNDER

Figure 14. Comparator Output Transfer Characteristics

Figure 15. Noninverting Comparator with Added Hysteresis

VHYS

OUTC1

(LT6119-1/LT6119-2)

OUTC2

(LT6119-2)

OUTC2

(LT6119-1)

VHYS

VTH

INCREASING

VINC1,2

611912 F14

V+

V–

INC2

V–

611912 F15

OUTA

V+

SENSEHI

LT6119-1

RIN

RSENSE

ILOAD

V+

SENSELO

OUTC2

400mV

REFERENCE

R1 VTH

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