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參數(shù)資料
| 型號(hào)： | LM3411M5X-5.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Precision Secondary Regulator/Driver |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 5 V, PDSO5 |
| 封裝： | SOT-23, SOP-5 |
| 文件頁(yè)數(shù)： | 10/13頁(yè) |
| 文件大?。?/td> | 350K |
| 代理商： | LM3411M5X-5.0 |
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Applications Information
(Continued)
The circuit in Figure 8 shows a 3.3V low dropout regulator
using the LM3411-3.3 and several discrete components.
This circuit is capable of excellent performance with both the
dropout voltage and the ground pin current specifications im-
proved over the LM2941/LM3411 circuit.
The standard LM317 three terminal adjustable regulator cir-
cuit can greatly benefit by adding a LM3411. Performance is
increased and features are added. The circuit shown in Fig-
ure 9 provides much improved line and load regulation,
lower temperature drift, and full remote output voltage sens-
ing on both the high and low side. In addition, a precise cur-
rent limit or constant current feature is simple to add.
Current limit protection in most IC regulators is mainly to pro-
tect the IC from gross over-current conditions which could
otherwise fuse bonding wires or blow IC metalization, there-
fore not much precision is needed for the actual current limit
values. Current limit tolerances can sometimes vary from
±
10% to as high as +300% over manufacturing and tem-
perature variations. Often critical circuitry requires a much
tighter control over the amount of current the power supply
can deliver. For example, a power supply may be needed
that can deliver 100% of its design current, but can still limit
the maximum current to 110% to protect critical circuitry from
high current fault conditions.
The circuit in Figure 9 can provide a current limit accuracy
that is better than
±
4%, over all possible variations, in addi-
tion
to
having
excellent
line,
specifications.
load
and
temperature
Like the positive regulators, the performance of negative ad-
justable regulators can also be improved by adding the
LM3411. Output voltages of either 3.3V or 5V at currents up
to 1.5A (3A when using a LM333) are possible. Adding two
resistors to the circuit in Figure 10adds the precision current
limit feature as shown in Figure 11 Current limit tolerances
of
±
4% over manufacturing and temperature variations are
possible with this circuit.
DS011987-19
FIGURE 7. Precision 5V 1A Low Dropout Regulator
DS011987-20
FIGURE 8. 3.3V 0.5A Low Dropout Regulator
DS011987-21
FIGURE 9. Precision Positive Voltage Regulator with Accurate Current Limit
L
www.national.com
10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3411N-3.3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| LM3411N-5.0 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 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 |
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