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參數(shù)資料
| 型號： | LM3478MM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Low-Side N-Channel Controller for Switching Regulator |
| 中文描述： | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 624K |
| 代理商： | LM3478MM |
Functional Description
(Continued)
The compensation ramp has been added internally in
LM3478. The slope of this compensation ramp has been
selected to satisfy most of the applications. The slope of the
internal compensation ramp depends on the frequency. This
slope can be calculated using the formula:
M
C
= V
SL
.F
S
Volts/second
In the above equation, V
SL
is the amplitude of the internal
compensation ramp. Limits for V
SL
have been specified in
the electrical characteristics.
In order to provide the user additional flexibility, a patented
scheme has been implemented inside the IC to increase the
slope of the compensation ramp externally, if the need
arises. Adding a single external resistor, R
(as shown in
Figure 4
) increases the slope of the compensation ramp, M
C
by :
In this equation,
V
SL
is equal to 40.10
-6
R
SL
. Hence,
V
versus R
SL
has been plotted in
Figure 5
for different
frequencies.
10135511
FIGURE 3. Compensation Ramp Avoids Sub-Harmonic Oscillation
L
www.national.com
11
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM3478MM/E7001794 | 制造商:Texas Instruments 功能描述: |
| LM3478MM/NOPB | 功能描述:DC/DC 開關控制器 HI EFF LOW-SIDE N CH CONTROLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3478MM/NOPB | 制造商:Texas Instruments 功能描述:Pulse Width Modulation (PWM) Controller |
| LM3478MMX | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM3478MMX/HALF | 制造商:Texas Instruments 功能描述: |
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