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參數(shù)資料
| 型號： | LPV511 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | 880 nA, Rail-to-Rail Input and Output Operational Amplifier |
| 中文描述： | 880 nA的，軌到軌輸入和輸出運(yùn)算放大器 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 836K |
| 代理商： | LPV511 |
Application Notes
The LPV511 is fabricated with National Semiconductor’s
state-of-the-art VIP50C process.
INPUT STAGE
The LPV511 has a rail-to-rail input which provides more
flexibility for the system designer. As can be seen from the
simplified schematic, rail-to-rail input is achieved by using in
parallel, one PNP differential pair and one NPN differential
pair. When the common mode input voltage (V
CM
) is near
V
+
, the NPN pair is on and the PNP pair is off. When V
CM
is
near V
, the NPN pair is off and the PNP pair is on. When
V
CM
is between V
+
and V
, internal logic decides how much
current each differential pair will get. This special logic en-
sures stable and low distortion amplifier operation within the
entire common mode voltage range.
Because both input stages have their own offset voltage
(V
) characteristic, the offset voltage of the LPV511 be-
comes a function of V
. V
OS
has a crossover point at 1.0V
below V
+
. Refer to the ’V
vs. V
’ curve in the Typical
Performance Characteristics section. Caution should be
taken in situations where the input signal amplitude is com-
parable to the V
value and/or the design requires high
accuracy. In these situations, it is necessary for the input
signal to avoid the crossover point.
The input bias current, I
will change in value and polarity as
the input crosses the transition region. In addition, param-
eters such as PSRR and CMRR which involve the input
offset voltage will also be affected by changes in V
CM
across
the differential pair transition region.
Differential input voltage is the difference in voltage between
the non-inverting (+) input and the inverting input () of the
op amp. Due to the three series diodes across the two
inputs, the absolute maximum differential input voltage is
±
2.1V. This may not be a problem to most conventional op
amp designs; however, designers should avoid using the
LPV511 as a comparator.
OUTPUT STAGE
The LPV511 output voltage swing 100 mV from rails
@
3V
supply, which provides the maximum possible dynamic
range at the output. This is particularly important when op-
erating on low supply voltages.
The LPV511 Maximum Output Voltage Swing defines the
maximum swing possible under a particular output load. The
LPV511 output swings 110 mV from the rail
@
5V supply with
an output load of 100 k
.
DRIVING CAPACITIVE LOAD
The LPV511 is unity gain stable. However, the unity gain
follower is the most sensitive configuration to capacitive
load. Direct capacitive loading reduces the phase margin of
the op amp. When the output is required to drive a large
capacitive load, greater than 100 pF, a small series resistor
at the output of the amplifier improves the phase margin (see
Figure 1
).
POWER SUPPLIES AND LAYOUT
The LPV511 operates from a single 2.7V to 12V power
supply. It is recommended to bypass the power supplies with
a 0.1 μF ceramic capacitor placed close to the V
+
and V
pins.
Ground layout improves performance by decreasing the
amount of stray capacitance and noise at the op amp’s
inputs and outputs. To decrease stray capacitance, minimize
PC board trace lengths and resistor leads, and place exter-
nal components close to the op amps’s pins.
Typical Applications
BATTERY CURRENT SENSING
The rail-to-rail common mode input range and the very low
quiescent current make the LPV511 ideal to use in high side
and low side battery current sensing applications. The high
side current sensing circuit in
Figure 2
is commonly used in
a battery charger to monitor the charging current in order to
prevent over charging.Asense resistor R
SENSE
is connected
to the battery directly.
20117025
FIGURE 1. Resistive Isolation of Capacitive Load
20117003
FIGURE 2. High Side Current Sensing
L
www.national.com
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LPV511MG | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LPV511MG/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 MICROPOWER RRIO OP AMP RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LPV511MGX | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LPV511MGX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LPV521 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Nanopower, 1.8V, RRIO, CMOS Input, Operational Amplifier |
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