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REF3312 データシート(PDF) 11 Page - Texas Instruments

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部品番号 REF3312
部品情報  0.9-V to 6.5-V, Nanopower Comparator
PDF  24 Pages
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

REF3312 データシート(HTML) 11 Page - Texas Instruments

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+V
+5 V
CC
R
100 k
LOAD
W
V
O
R3
1 MW
R2
1 MW
R1
1 MW
V
IN
V
A
5 V
0 V
1.67 V
3.33 V
V
A2
V
A1
V
IN
V
O High
+V
CC
V
O Low
+V
CC
V
A1
R1
R2
R3
V
A2
R1
R2
R3
D
-
V = V
V
A
A1
A2
V
= V
A2
CC
´
R2 || R3
R1 + (R2 || R3)
V
= V
A1
CC
´
R2
(R1 || R3) + R2
TLV3691
www.ti.com
SBOS694 – DECEMBER 2013
Inverting Comparator With Hysteresis
The inverting comparator with hysteresis requires a three-resistor network that is referenced to the comparator
supply voltage (VCC), as shown in Figure 29. When VIN at the inverting input is less than VA, the output voltage is
high (for simplicity, assume VO switches as high as VCC). The three network resistors can be represented as R1
|| R3 in series with R2. The high to low trip voltage (VA1) is defined by Equation 1:
(1)
When VIN is greater than VA, the output voltage is low, very close to ground. In this case, the three network
resistors can be presented as R2 || R3 in series with R1. The low to high trip voltage (VA2) is defined by
Equation 2:
(2)
The total hysteresis provided by the network is defined by Equation 3:
(3)
Figure 29. TLV3691 in an Inverting Configuration with Hysteresis
Copyright © 2013, Texas Instruments Incorporated
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