參數(shù)資料
型號(hào)： LT6109IMS-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO10
封裝： LEAD FREE, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 10/28頁(yè)
文件大小： 370K
代理商： LT6109IMS-1#PBF
LT6109-1/LT6109-2
18
610912f
APPLICATIONS INFORMATION
Thedesiredtrippointsandfull-scaleanalogoutputvoltage
for the circuit in Figure 13 can be achieved as follows:
R1
=
400mV
IOVER
R2
=
VMAX –IMAX R1
( )
IMAX
R3
=
400mV – IUNDER R1+ R2
(
)
IUNDER
Trip points for the LT6109-2 can be set by replacing IUNDER
with a second overcurrent, IOVER2.
Hysteresis
Eachcomparatorhasabuilt-inhysteresisof10mVtypically
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 12.
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 13 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.
R6
=
400mV – VHYS(EXTRA)
IUNDER
R1 should be chosen such that R1 >> R6 so that VOUTA
does not change significantly when the comparator trips.
Figure 12. Comparator Output Transfer Characteristics
Figure 13. Noninverting Comparator with Added Hysteresis
VHYS
OUTC1
(LT6109-1/LT6109-2)
OUTC2
(LT6109-2)
OUTC2
(LT6109-1)
VHYS
VTH
INCREASING
VINC1,2
610912 F12
–
+
V+
V–
INC2
V–
5
610912 F13
OUTA
7
8
V+
SENSEHI
9
10
1
3
LT6109-1
RIN
RSENSE
ILOAD
R3
V+
SENSELO
OUTC2
400mV
R5
R6
R1 VTH
R2
+
–
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