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參數資料
| 型號： | LMV324MX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | General Purpose, Low Voltage, Rail-to-Rail Output Operational Amplifiers |
| 中文描述： | QUAD OP-AMP, 9000 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁數： | 20/27頁 |
| 文件大小： | 1151K |
| 代理商： | LMV324MX |
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Application Notes
(Continued)
4.6 CURRENT SOURCE AND SINK
The LMV321/358/324 can be used in feedback loops which
regulate the current in external PNP transistors to provide
current sources or in external NPN transistors to provide
current sinks.
4.6.1 Fixed Current Source
A multiple fixed current source is show in
Figure 20
. A
voltage (V
= 2V) is established across resistor R
by the
voltage divider (R
and R
). Negative feedback is used to
cause the voltage drop across R
to be equal to V
. This
controls the emitter current of transistor Q
and if we neglect
the base current of Q
and Q
, essentially this same current
is available out of the collector of Q
1
.
Large input resistors can be used to reduce current loss and
a Darlington connection can be used to reduce errors due to
the
β
of Q
1
.
The resistor, R
, can be used to scale the collector current of
Q
2
either above or below the 1mA reference value.
4.6.2 High Compliance Current Sink
A current sink circuit is shown in
Figure 21
. The circuit
requires only one resistor (R
E
) and supplies an output cur-
rent which is directly proportional to this resistor value.
4.7 POWER AMPLIFIER
A power amplifier is illustrated in
Figure 22
. This circuit can
provide a higher output current because a transistor follower
is added to the output of the op amp.
4.8 LED DRIVER
The LMV321/358/324 can be used to drive an LED as shown
in
Figure 23
.
10006076
FIGURE 19. Squarewave Generator
10006080
FIGURE 20. Fixed Current Source
10006082
FIGURE 21. High Compliance Current Sink
10006079
FIGURE 22. Power Amplifier
10006084
FIGURE 23. LED Driver
L
www.national.com
20
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMV324MX/NOPB | 功能描述:運算放大器 - 運放 GEN PURP, LOW VLTG, RRO OP AMP RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV324PW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-VOLTAGE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS |
| LMV324Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-VOLTAGE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS |
| LMV324-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-VOLTAGE RAIL-TO-RAIL OUTPUT OPERATIONAL AMPLIFIERS |
| LMV324Q1MA/NOPB | 功能描述:運算放大器 - 運放 Auto Quad Lo-Vtg RR Output Op Amp RoHS:否 制造商:STMicroelectronics 通道數量: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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