LT6109IMS-1#TRPBF Linear Technology, LT6109IMS-1#TRPBF Datasheet - Page 18

• Manufacturer Part Number: LT6109IMS-1#TRPBF
• Manufacturer: Linear Technology

Specifications of LT6109IMS-1#TRPBF

• Lead Free Status / Rohs Status: Compliant

LT6109-1/LT6109-2
APPLICATIONS INFORMATION
The desired trip points and full-scale analog output voltage
for the circuit in Figure 13 can be achieved as follows:
Trip points for the LT6109-2 can be set by replacing I
with a second overcurrent, I
Hysteresis
Each comparator has a built-in hysteresis of 10mV typically
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-
18
R1=
R2 =
R3 =
400mV
V
400mV – I
I
OVER
MAX
I
– I
MAX
MAX
I
UNDER
UNDER
( )
R1
(
V
R1+ R2
V
+
+
OVER2
R3
R
SENSE
I
LOAD
R
Figure 13. Noninverting Comparator with Added Hysteresis
)
IN
.
10
1
3
SENSEHI
SENSELO
OUTC2
LT6109-1
–
+
UNDER
V
V
+
–
R2
V
V
+
9
+
ing input thresholds, V
remains unaffected).
Figure 13 shows how to add additional hysteresis to a
noninverting comparator.
R6 can be calculated from the extra hysteresis being added,
V
want to cause the comparator output to trip, I
that the hysteresis being added, V
to the typical 10mV of built-in hysteresis.
R1 should be chosen such that R1 >> R6 so that V
does not change significantly when the comparator trips.
–
HYS(EXTRA)
+
R6 =
Figure 12. Comparator Output Transfer Characteristics
(LT6109-1/LT6109-2)
400mV
400mV – V
V
5
(LT6109-2)
(LT6109-1)
–
OUTA
INC2
and the amplifier output current which you
OUTC1
OUTC2
OUTC2
I
UNDER
8
7
HYS(EXTRA)
610912 F13
R1 VTH
TH
(the actual internal threshold
R5
R6
V
HYS(EXTRA)
HYS
V
TH
V
HYS
INCREASING
, is in addition
V
UNDER
INC1,2
610912 F12
. Note
610912f
OUTA