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參數(shù)資料
| 型號： | LTC1843I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Hex Inverter 14-SOIC -40 to 85 |
| 中文描述： | 超低功耗雙比較參考 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 249K |
| 代理商： | LTC1843I |
9
LTC1841/LTC1842/LTC1843
APPLICATIO
S I
FOR
ATIO
U
W
U
U
1.
Choose the required hysteresis voltage band and
calculate values for R4 and R5 according to the formu-
las in the hysteresis section. In this example,
±
5mV of
hysteresis has been added at the comparator input
(V
H
= V
HB
/2). Note that the hysteresis apparent at V
IN
will be larger because of the input resistor divider.
2. Select R1. The leakage current into IN B
–
is under 1nA
so the current through R1 should exceed 100nA, to
ensure threshold accuracy. R1 values up to about 10M
can be used, but values in the 100k to 1M range are
usually easier to deal with. In this example choose
R1 = 294k.
3. Calculate R2 + R3. The overvoltage threshold should be
set at 5.5V. The design equation is as follows:
R
R
R
V
V
V
k
M
UTH
+
REF
H
5 5
2
3
1
1
294
1 182 0 005
.
1
1 068
.
+
=
=
=
–
.
.
–
4. Calculate R2. The undervoltage threshold should be set
at 4.5V. The design equation is as follows:
R
R
(
(
R
R
V
V
V
1 182 0 005
4 5
.
R
k
M
k
k
REF
H
LTH
.
2
1
2
3
1
294
1 068
.
294
62 2
=
+
+
)
=
+
)
=
–
–
– .
–
.
Choose R2 = 61.9k (1% standard value)
5. Calculate R3:
R3 = (R2 + R3) – R2
= 1.068M – 61.9k
= 1.006M
Choose R3 = 1M (1% standard value)
6. Verify the resistor values. The equations are as
follows, evaluated for the above example:
Overvoltage threshold:
V
V
V
R
R
R
R
V
OTH
REF
H
=
+
(
5 474
.
)
+
+
=
1
2
1
3
Undervoltage threshold:
V
V
V
R
R
+
1
R
R
R
V
UTH
REF
H
=
(
=
)
+
+
–
.
1
2
3
2
4 484
where the hysteresis voltage
V
V
R
R
H
REF
=
(
)
5
4
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