- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄361031 > LM611D-SERIES Optoelectronic PDF資料下載
參數(shù)資料
| 型號(hào)： | LM611D-SERIES |
| 英文描述： | Optoelectronic |
| 中文描述： | 光電 |
| 文件頁(yè)數(shù)： | 11/17頁(yè) |
| 文件大?。?/td> | 735K |
| 代理商： | LM611D-SERIES |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)
Application Information
(Continued)
The reference equivalent circuit reveals how V
is held at the
constant 1.2V by feedback, and how the FEEDBACK pin
passes little current.
To generate the required reverse current, typically a resistor
is connected from a supply voltage higher than the reference
voltage. Varying that voltage, and so varying I
, has small ef-
fect with the equivalent series resistance of less than an ohm
at the higher currents.Alternatively, an active current source,
such as the LM134 series, may generate I
r
.
Capacitors in parallel with the reference are allowed. See the
Reference AC Stability Range curve for capacitance
values— from 20 μA to 3 mA any capacitor value is stable.
With the reference’s wide stability range with resistive and
capacitive loads, a wide range of RC filter values will perform
noise filtering.
Adjustable Reference
The FEEDBACK pin allows the reference output voltage,
V
, to vary from 1.24V to 6.3V. The reference attempts to
hold V
at 1.24V. If V
is above 1.24V, the reference will con-
duct current from Cathode to Anode; FEEDBACK current al-
ways remains low. If FEEDBACK is connected to Anode,
then V
= V
= 1.24V. For higher voltages FEEDBACK is
held at a constant voltage above Anode— say 3.76V for V
ro
=5V. Connecting a resistor across the constant V
generates
a current I=R1/V
flowing from Cathode into FEEDBACK
node.AThevenin equivalent 3.76V is generated from FEED-
BACK to Anode with R2=3.76/I. Keep I greater than one
thousand times larger than FEEDBACK bias current for
<
0.1% error— I
≥
32 μAfor the military grade over the military
temperature range (I
≥
5.5 μA for a 1% untrimmed error for a
commercial part.)
R1 = Vr/I = 1.24/32μ = 39k
R2 = R1 {(Vro/Vr) 1} = 39k {(5/1.24) 1)} = 118k
Understanding that V
is fixed and that voltage sources, re-
sistors, and capacitors may be tied to the FEEDBACK pin, a
range of V
r
temperature coefficients may be synthesized.
DS009221-15
FIGURE 2. Reference Equivalent Circuit
DS009221-16
FIGURE 3. 1.2V Reference
DS009221-17
FIGURE 4. Thevenin Equivalent of
Reference with 5V Output
DS009221-18
FIGURE 5. Resistors R1 and R2 Program
Reference Output Voltage to be 5V
DS009221-19
FIGURE 6. Output Voltage has Negative Temperature
Coefficient (TC) if R2 has Negative TC
DS009221-20
FIGURE 7. Output Voltage has Positive TC
if R1 has Negative TC
www.national.com
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM611IMX | Voltage-Feedback Operational Amplifier |
| LM611IN | Voltage-Feedback Operational Amplifier |
| LM611MJ | Voltage-Feedback Operational Amplifier |
| LM6118H | Voltage-Feedback Operational Amplifier |
| LM6118J | Voltage-Feedback Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM611IM | 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 |
| LM611IM/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 Op Amp & Adj Ref 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 |
| LM611IM/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LM611IMX | 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 |
| LM611IMX/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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。