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參數(shù)資料
| 型號(hào)： | 4TPB220ML |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages |
| 中文描述： | N溝道場(chǎng)效應(yīng)管同步降壓穩(wěn)壓控制器輸出電壓低 |
| 文件頁(yè)數(shù)： | 9/22頁(yè) |
| 文件大?。?/td> | 602K |
| 代理商： | 4TPB220ML |
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Example Circuits (Continued)
This circuit shows the LM27x7 paired with a cost effective
solution to provide the 5V chip power supply, using no extra
components other than the LM78L05 regulator itself. The
input voltage comes from a ’brick’ power supply which does
not regulate the 12V line tightly. Additional, inexpensive 10uF
ceramic capacitors (Cinx and Cox) help isolate devices with
sensitive databands, such as DSL and cable modems, from
switching noise and harmonics.
In situations where low cost is very important, the LM27x7
can also be used as an asynchronous controller, as shown in
the above circuit. Although a a schottky diode in place of the
bottom FET will not be as efficient, it will cost much less than
the FET. The 5V at low current needed to run the LM27x7
could come from a zener diode or inexpensive regulator,
such as the one shown in Figure 7. Because the LM27x7
senses current in the low side MOSFET, the current limit
feature will not function in an asynchronous design. The
ISEN pin should be left open in this case.
20049408
FIGURE 7. 12V Unregulated to 3.3V, 3A, 750kHz
20049409
FIGURE 8. 12V to 5V, 1.8A, 100kHz
LM2727/LM2737
www.national.com
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 4TPB220ML | 制造商:SANYO Semiconductor Co Ltd 功能描述:CAPACITOR 220UF 4V |
| 4TPB330ML | 功能描述:鉭質(zhì)電容器-SMD聚合物 4volts 330uF ESR 40mohm RoHS:否 制造商:Kemet 電容:33 uF 電壓額定值:50 V ESR:40 mOhms 容差:20 % 工作溫度范圍: 外殼代碼 - in:2917 外殼代碼 - mm:7343 高度:4 mm 制造商庫(kù)存號(hào):X Case 系列:T543 產(chǎn)品: 封裝:Reel |
| 4TPB330ML | 制造商:SANYO Semiconductor Co Ltd 功能描述:CAPACITOR 330UF 4V |
| 4TPB470M | 制造商:SANYO 功能描述:CAPACITOR, 470UF, 4V 制造商:SANYO 功能描述:CAPACITOR, 470UF, 4V Bulk 制造商:SANYO Semiconductor Co Ltd 功能描述:CAPACITOR 470UF 4V 制造商:SANYO Semiconductor Co Ltd 功能描述:CAPACITOR, 470UF, 4V |
| 4TPB470M | 制造商:SANYO Semiconductor Co Ltd 功能描述:CAPACITOR 470UF 4V |
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