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參數(shù)資料
| 型號： | LM3152MH-5.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 479K |
| 代理商： | LM3152MH-5.0 |
Thermal Protection
The LM3151/2/3 should be operated such that the junction
temperature does not exceed the maximum operating junc-
tion temperature. An internal thermal shutdown circuit, which
activates at 165°C (typical), takes the controller to a low-pow-
er reset state by disabling the buck switch and the on-timer,
and grounding the SS pin. This feature helps prevent catas-
trophic failures from accidental device overheating. When the
junction temperature falls back below 150°C the SS pin is re-
leased and normal operation resumes.
Design Guide
The design guide provides the equations required to design
with the LM3151/2/3 SIMPLE SWITCHER Controller.
WEBENCH design tool can be used with or in place of this
section for a more complete and simplified design process.
1. Define Power Supply Operating Conditions
a. Maximum and Minimum DC Input voltage
b. Maximum Expected Load Current during normal operation
c. Target Switching Frequency
2. Determine which IC Controller to Use
The desired input voltage range will determine which version
of the LM3151/2/3 controller will be chosen. The higher
switching frequency options allow for physically smaller in-
ductors but efficiency may decrease.
3. Determine Inductor Required Using Figure 2
To use the nomograph below calculate the inductor volt-mi-
crosecond constant ET from the following formula:
Where f
S is in kHz units. The intersection of the Load Current
and the Volt-microseconds lines on the chart below will de-
termine which inductors are capable for use in the design. The
chart shows a sample of parts that can be used. The offline
calculator tools and WEBENCH will fully calculate the re-
quirements for the components needed for the design.
30053252
FIGURE 2. Inductor Nomograph
11
www.national.com
LM3151/LM3152/LM3153
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| LM3151MHE-2.5 | SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO14 |
| LM3153MHE-5.0 | SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PDSO14 |
| LM3151MHX-2.5 | SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO14 |
| LM329BH#PBF | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.9 V, MBCY2 |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM3152MHE-3.3 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:SIMPLE SWITCHER 6~42V 14TSSOP |
| LM3152MHE-3.3/NOPB | 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 |
| LM3152MHX-3.3 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER? CONTROLLER, High Input Voltage Synchronous Step-Down |
| LM3152MHX-3.3/NOPB | 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 |
| LM3153 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER? CONTROLLER, High Input Voltage Synchronous Step-Down |
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