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參數(shù)資料
| 型號： | LMV710 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運算放大器 |
| 英文描述： | Low Power, RRIO Operational Amplifiers with High Output Current Drive and Shutdown Option |
| 中文描述： | 低功耗，RRIO運算放大器具有高輸出電流驅(qū)動和關(guān)機選項 |
| 文件頁數(shù)： | 13/19頁 |
| 文件大?。?/td> | 708K |
| 代理商： | LMV710 |
Application Note
(Continued)
The capacitor C
1
is first discharged by applying a positive
pulse to the reset transistor. When a positive voltage V
IN
is
applied to the input, the input voltage is higher than the
voltage across C
. The output of the op amp goes high and
forward biases the diode D
. The capacitor C
is charged to
V
. When the input becomes less than the current capacitor
voltage, the output of the op amp A1 goes low and the diode
D
is reverse biased. This isolates the C
and leaves it with
the charge equivalent to the peak of the input voltage. The
follower prevents unintentional discharging of C
1
by loading
from the following circuit.
R
and C
are properly selected so that the capacitor is
charged rapidly to V
. During the holding period, the capaci-
tor slowly discharge through C
, via leakage of the capacitor
and the reverse-biased diode, or op amp bias currents. In
any cases the discharging time constant is much larger than
the charge time constant. And the capacitor can hold its
voltage long enough to minimize the output ripple.
Resistors R
and R
limit the current into the inverting input
of A1 and the non-inverting input of A2 when power is
disconnected from the circuit. The discharging current from
C
1
during power off may damage the input circuitry of the op
amps.
The peak detector can be reset by applying a positive pulse
to the reset transistor. The charge on the capacitor is
dumped into ground, and the detector is ready for another
cycle.
The maximum input voltage to this detector should be less
than (V
+
- V
), where V
is the forward voltage drop of the
diode. Otherwise, the input voltage should be scaled down
before applying to the circuit.
HIGH SIDE CURRENT SENSING
The high side current sensing circuit (
Figure 8
) is commonly
used in a battery charger to monitor charging current to
prevent over-charging. A sense resistor R
sense
is connected
to the battery directly. This system requires an op amp with
rail-to-rail input. The LMV710/711/715 are ideal for this ap-
plication because its common mode input range can go
beyond the positive rail.
10132523
FIGURE 7. Peak Detector
10132513
FIGURE 8. High Side Current Sensing
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV710IDBVR | 功能描述:運算放大器 - 運放 Sngl Lo-Pwr RRIO Hi Out Crnt Drv/Shtdwn 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 |
| LMV710IDBVRE4 | 功能描述:運算放大器 - 運放 Sngl Lo-Pwr RRIO Hi Out Crnt Drv/Shtdwn 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 |
| LMV710IDBVRG4 | 功能描述:運算放大器 - 運放 Sgl Low-Pwr 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 |
| LMV710IDCKR | 功能描述:運算放大器 - 運放 Sngl Lo-Pwr RRIO Hi Out Crnt Drv/Shtdwn 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 |
| LMV710IDCKRE4 | 功能描述:運算放大器 - 運放 Sngl Lo-Pwr RRIO Hi Out Crnt Drv/Shtdwn 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 |
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