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| 型號： | OPA2369AIDGKRG4 |
| 英文描述： | 1.8V, 1レA max, Zer┆-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER |
| 中文描述： | 1.8，1レ阿最大，澤爾┆-交叉軌至軌I / O運算放大器 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 644K |
| 代理商： | OPA2369AIDGKRG4 |
www.ti.com
R =
V
REF
1000(I
BMAX
)
1.2V
1000(50pA)
=
= 24M
2. Choose
battery-monitoring
adequate.
3. Calculate R
1
as follows:
20M
the
W
W
(1)
For
R = R
F
= 20M
W
V
HYST
V
BATT
= 420k
W
50mV
2.4V
(2)
R
I
OPA369
V
IN
V
OUT
R
F
C
FB
C
IN
BATTERY MONITORING
The low operating voltage and quiescent current of
the OPA369 series make it an excellent choice for
battery
monitoring
applications,
Figure 26
. In this circuit, V
STATUS
is high as long as
the battery voltage remains above 2V. A low-power
reference is used to set the trip point. Resistor values
are selected as follows:
R =
-
V
THRS
V
BATT
1
R
1
1
(
)
-
1
R
1
=
-
2V
′
1.2V
(
420k
W
1
420k
W
1
)
-
1
20M
W
= 650k
W
6. Calculate R
BIAS
: The minimum supply voltage for
this circuit is 1.8V. The REF1112 has a current
requirement
of
1.2
μ
A
REF1112 with 2
μ
A of supply current assures
proper operation. Therefore:
(3)
R
=
BIAS
= 0.9M
W
V
BATTMIN
I
BIAS
=1.8V
2 A
m
(4)
REF1112
OPA369
+IN
OUT
-
IN
V
STATUS
V
BATT
V
REF
R
1
R
2
R
BIAS
I
BIAS
R
F
+
OPA369
OPA2369
SBOS414A–AUGUST 2007–REVISED SEPTEMBER 2007
In unity-gain inverter configuration, phase margin can
be reduced by the reaction between the capacitance
at the op amp input and the gain setting resistors.
Best performance is achieved by using smaller
valued
resistors.
However,
resistors cannot be avoided, a small (4pF to 6pF)
capacitor, C
FB
, can be inserted in the feedback, as
shown in
Figure 25
. This configuration significantly
reduces overshoot by compensating the effect of
capacitance, C
IN
, which includes the amplifier input
capacitance and printed circuit board (PCB) parasitic
capacitance.
1. Selecting R
F
: Select R
F
such that the current
through R
F
is approximately 1000x larger than
the maximum bias current over temperature:
when
larger
valued
hysteresis
voltage,
V
HYST
.
50mV
applications,
is
4. Select a threshold voltage for V
IN
rising (V
THRS
) =
2.0V
5. Calculate R
2
as follows:
Figure 25. Improving Stability for Large R
F
and R
IN
as
shown
in
(max).
Providing
the
Figure 26. Battery Monitor
10
Submit Documentation Feedback
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s):
OPA369 OPA2369
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