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參數(shù)資料
| 型號(hào)： | LM3488MMX |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 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(yè)數(shù)： | 20/24頁(yè) |
| 文件大?。?/td> | 626K |
| 代理商： | LM3488MMX |
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Designing SEPIC Using LM3488
(Continued)
The duty cycle of a SEPIC is given by:
In the above equation, V
Q
is the on-state voltage of the
MOSFET, Q, and V
DIODE
is the forward voltage drop of the
diode.
POWER MOSFET SELECTION
As in boost converter, the parameters governing the selec-
tion of the MOSFET are the minimum threshold voltage,
V
TH(MIN)
, the on-resistance, R
DS(ON)
, the total gate charge,
Q
RSS
, and the maxi-
mum drain to source voltage, V
DS(MAX)
voltage in a SEPIC is given by:
V
SW(PEAK)
= V
IN
+ V
OUT
+ V
DIODE
The selected MOSFET should satisfy the condition:
V
DS(MAX)
>
V
SW(PEAK)
The peak switch current is given by:
The rms current through the switch is given by:
POWER DIODE SELECTION
The Power diode must be selected to handle the peak
current and the peak reverse voltage. In a SEPIC, the diode
peak current is the same as the switch peak current. The
off-state voltage or peak reverse voltage of the diode is V
IN
+ V
. Similar to the boost converter, the average diode
current is equal to the output current. Schottky diodes are
recommended.
SELECTION OF INDUCTORS L1 AND L2
Proper selection of the inductors L1 and L2 to maintain
constant current mode requires calculations of the following
parameters.
Average current in the inductors:
I
L2AVE
= I
OUT
Peak to peak ripple current, to calculate core loss if neces-
sary:
maintains the condition I
L
>
i
L
to ensure constant current
mode.
10138844
FIGURE 14. Typical SEPIC Converter
L
www.national.com
20
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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(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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(chēng):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(chēng):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(chēng):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(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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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