- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358843 > LM3411N-5.0 (NATIONAL SEMICONDUCTOR CORP) IC-VOLTAGE REGULATOR 5V PDF資料下載
參數(shù)資料
| 型號： | LM3411N-5.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | IC-VOLTAGE REGULATOR 5V |
| 中文描述： | THREE TERM VOLTAGE REFERENCE, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大小： | 350K |
| 代理商： | LM3411N-5.0 |
Product Description
The LM3411 is a shunt regulator specifically designed to be
the reference and control section in an overall feedback loop
of a regulated power supply. The regulated output voltage is
sensed between the IN pin and GROUND pin of the LM3411.
If the voltage at the IN pin is less than the LM3411 regulating
voltage (V
), the OUT pin sources no current. As the volt-
age at the IN pin approaches the V
voltage, the OUT pin
begins sourcing current. This current is then used to drive a
feedback device, (opto-coupler) or a power device, (linear
regulator, switching regulator, etc.) which servos the output
voltage to be the same value as V
REG
.
In some applications, (even under normal operating condi-
tions) the voltage on the IN pin can be forced above the
V
voltage. In these instances, the maximum voltage ap-
plied to the IN pin should not exceed 20V. In addition, an ex-
ternal resistor may be required on the OUT pin to limit the
maximum current to 20 mA.
Compensation
The inverting input of the error amplifier is brought out to al-
low overall closed-loop compensation. In many of the appli-
cations circuits shown here, compensation is provided by a
single capacitor connected from the compensation pin to the
out pin of the LM3411. The capacitor values shown in the
schematics are adequate under most conditions, but they
can be increased or decreased depending on the desired
loop response. Applying a load pulse to the output of a regu-
lator circuit and observing the resultant output voltage re-
sponse is a easy method of determining the stability of the
control loop. Analyzing more complex feedback loops re-
quires additional information.
The formula for AC gain at a frequency (f) is as follows;
where R
f
≈
52 k
for the 3.3V part, and R
f
≈
94 k
for the 5V
part.
The resistor (R
) in the formula is an internal resistor located
on the die. Since this resistor value will affect the phase mar-
gin, the worst case maximum and minimum values are im-
portant when analyzing closed loop stability. The minimum
and maximum room temperature values of this resistor are
specified in the Electrical Characteristics section of this data
sheet, and a curve showing the temperature coefficient is
shown in the curves section. In the applications shown here,
the worst case phase margin occurs with minimum values of
R
f
.
Test Circuit
The test circuit shown in Figure 2 can be used to measure
and verify various LM3411 parameters. Test conditions are
set by forcing the appropriate voltage at the V
Set test
point and selecting the appropriate R
or I
as specified in
the Electrical Characteristics section. Use a DVM at the
“measure” test points to read the data.
DS011987-14
FIGURE 2. LM3411 Test Circuit
L
www.national.com
7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3411M5-3.3 | Hook-Up Wire; Conductor Size AWG:22; No. Strands x Strand Size:7 x 30; Jacket Color:White/Red; Cable/Wire MIL SPEC:MIL-W-16878/1 Type B; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes |
| LM3411AM5-5.0 | Precision Secondary Regulator/Driver |
| LM3411AM5X-5.0 | Precision Secondary Regulator/Driver |
| LM3411M5X-5.0 | Precision Secondary Regulator/Driver |
| LM3411 | Precision Secondary Regulator/Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3414 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1A 60W Common Anode Capable Constant Current Buck LED Driver Requires No |
| LM3414HV | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1A 65V LED Driver Evaluation Board Switching frequency: 500 kHz |
| LM3414HVMR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1A 60W Common Anode Capable Constant Current Buck LED Driver Requires No |
| LM3414HVMR/NOPB | 功能描述:LED照明驅(qū)動器 COMM ANODE CAP CONST CRNT BUCK LED DRVR RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3414HVMREVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 LM3414HVMR EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。