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參數(shù)資料
| 型號： | LM3488MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大小： | 626K |
| 代理商： | LM3488MMX |
Functional Description
(Continued)
FREQUENCY
ADJUST/SYNCHRONIZATION/SHUTDOWN
The switching frequency of LM3488 can be adjusted be-
tween 100kHz and 1MHz using a single external resistor.
This resistor must be connected between FA/SYNC/SD pin
and ground, as shown in
Figure 6
. Please refer to the typical
performance characteristics to determine the value of the
resistor required for a desired switching frequency.
The LM3488 can be synchronized to an external clock. The
external clock must be connected to the FA/SYNC/SD pin
through a resistor, R
SYNC
as shown in
Figure 7
. The value of
this resistor is dependent on the off time of the synchroniza-
tion pulse, T
.
Table 1
shows the range of resistors
to be used for a given T
OFF(SYNC)
.
TABLE 1.
T
OFF(SYNC)
(μsec)
1
2
3
R
SYNC
range (k
)
5 to 13
20 to 40
40 to 65
10138813
FIGURE 4. Increasing the Slope of the Compensation Ramp
10138851
FIGURE 5.
V
SL
vs R
SL
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3488MMX/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| LM3488Q | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Efficiency Low-Side N-Channel Controller for Switching Regulators |
| LM3488-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Efficiency Low-Side N-Channel Controller for Switching Regulators |
| LM3488QMM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Efficiency Low-Side N-Channel Controller for Switching Regulators |
| LM3488QMM/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
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