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參數(shù)資料
| 型號： | LM2677T-ADJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator with Sync |
| 中文描述： | 8.75 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, ZFM7 |
| 封裝： | TO-220, 7 PIN |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 847K |
| 代理商： | LM2677T-ADJ |
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Application Hints
(Continued)
DESIGN CONSIDERATIONS
Power supply design using the LM2677 is greatly simplified
by using recommended external components. A wide range
of inductors, capacitors and Schottky diodes from several
manufacturers have been evaluated for use in designs that
cover the full range of capabilities (input voltage, output
voltage and load current) of the LM2677. A simple design
procedure using nomographs and component tables pro-
vided in this data sheet leads to a working design with very
little effort. Alternatively, the design software,
LM267X Made
Simple
(version 6.0), can also be used to provide instant
component selection, circuit performance calculations for
evaluation, a bill of materials component list and a circuit
schematic.
The individual components from the various manufacturers
called out for use are still just a small sample of the vast
array of components available in the industry. While these
components are recommended, they are not exclusively the
only components for use in a design. After a close compari-
son of component specifications, equivalent devices from
other manufacturers could be substituted for use in an ap-
plication.
Important considerations for each external component and
an explanation of how the nomographs and selection tables
were developed follows.
INDUCTOR
The inductor is the key component in a switching regulator.
For efficiency the inductor stores energy during the switch
ON time and then transfers energy to the load while the
switch is OFF.
Nomographs are used to select the inductance value re-
quired for a given set of operating conditions. The nomo-
graphs assume that the circuit is operating in continuous
mode (the current flowing through the inductor never falls to
zero). The magnitude of inductance is selected to maintain a
10130107
FIGURE 1. Basic circuit for fixed output voltage applications.
10130108
FIGURE 2. Basic circuit for adjustable output voltage applications
L
www.national.com
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2678SX-ADJ | SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| LM2678SD-ADJ | SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| LM2678S-12 | IC LOGIC 125 LOW-VOLTAGE SINGLE FET 8-OHM BUS SWITCH -40+85C SOT-23-5 3000/REEL |
| LM2678S-3.3 | 3.0V, SOTiny, 0.4-Ohm Dual SPDT Analog Switch |
| LM2678S-5.0 | 3.0V, SOTiny, 0.8-Ohms Dual SPDT Analog Switch with -1.0V to 3.3V Operating Range |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2677T-ADJ/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM2678 | 制造商:Texas Instruments 功能描述: |
| LM2678_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER㈢ High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-12 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
| LM2678-3.3 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator |
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