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參數資料
| 型號： | OPA237NA250 |
| 英文描述： | SINGLE-SUPPLY OPERATIONAL AMPLIFIERS MicroAmplifier⑩ Series |
| 中文描述： | 單電源運算放大器MicroAmplifier⑩系列 |
| 文件頁數： | 10/19頁 |
| 文件大?。?/td> | 1364K |
| 代理商： | OPA237NA250 |
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SBOS057A OCTOBER 1996 REVISED FEBRUARY 2007
www.ti.com
10
APPLICATION INFORMATION
OPA237 series op amps are unity-gain stable and suitable
for a wide range of general-purpose applications. Power
supply pins should be bypassed with 10nF ceramic
capacitors.
OPERATING VOLTAGE
OPA237 series op amps operate from single (+2.7V to
+36V) or dual (
±
1.35V to
±
18V) supplies with excellent
performance.
Most behavior remains unchanged
throughout the full operating voltage range. Parameters
which vary significantly with operating voltage are shown
in typical performance curves. Specifications are
production tested with +2.7V, +5V, and
±
15V supplies.
OUTPUT CURRENT AND STABILITY
OPA237 series op amps can drive large capacitive loads.
However, under certain limited output conditions any op
amp may become unstable. Figure 1 shows the region
where the OPA237 has a potential for instability. These
load conditions are rarely encountered, especially for
single supply applications. For example, take the case
when a +5V supply with a 10k
load to V
S
/2 is used.
OPA237 series op amps remain stable with capacitive
loads up to 4,000pF, if sinking current and up to 10,000pF,
if sourcing current. Furthermore, in single-supply
applications where the load is connected to ground, the op
amp is only sourcing current, and as shown Figure 1, can
drive 10,000pF with output currents up to 1.5mA.
2
0.5
1
1.5
Output Current (mA)
2
1.5
1
0.5
0
100k
10k
1k
100
10
C
V
S
= +2.7V
V
S
= +5V,
±
15V
OPERATION NOT
RECOMMENDED
Figure 1. Stability-Capacitive Load vs Output
Current
R
L
10
A1
OPA237
+
R
1
38.3k
R
3
38.3k
R
5
383k
R
6
10k
R
7
9.09k
R
4
20k
R
2
19.1k
A2
OPA237
R
8
100k
R
H
10
I
H
V+
V
V+
V
2.7V to =
±
15V
V+ for A
1
, A
2
In
+In
In
+In
V
O
= 10
I
H
R
H
To Load
To Load
V
O
= 10
I
L
R
L
Commonmode range of A2
extends to V
for lowside sensing
Optional for I
B
Cancellation
(R
7
= R
6
II R
8
)
R
and R
divide down the
commonmode input to A1.
LowSide
Current Sense
HighSide
Current Sense
Out
Out
NOTE: Low and highside sensing circuits can be used independently.
V
for A
1
, A
2
I
L
Figure 2. Low and High-Side Battery Current Sensing
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| OPA237NA-250 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
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| OPA237NA3KE4 | 制造商:BB 制造商全稱:BB 功能描述:SINGLE-SUPPLY OPERATIONAL AMPLIFIERS MicroAmplifier⑩ Series |
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