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參數(shù)資料
| 型號： | C3216X7R1E105K |
| 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溝道場效應(yīng)管同步降壓穩(wěn)壓控制器輸出電壓低 |
| 文件頁數(shù)： | 17/22頁 |
| 文件大?。?/td> | 602K |
| 代理商： | C3216X7R1E105K |
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
L
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 |
|---|---|
| C3216X7R1E105K /8 | 制造商:TDK CORPORATION OF AMERICA 功能描述:Cap Ceramic 1uF 25V X7R 10% SMD 1206 125?C T/R |
| C3216X7R1E105K/0.85 | 功能描述:多層陶瓷電容器MLCC - SMD/SMT 1206 1.0uF 25V X7R 10% RoHS:否 制造商:American Technical Ceramics (ATC) 電容:10 pF 容差:1 % 電壓額定值:250 V 溫度系數(shù)/代碼:C0G (NP0) 外殼代碼 - in:0505 外殼代碼 - mm:1414 工作溫度范圍:- 55 C to + 125 C 產(chǎn)品:Low ESR MLCCs 封裝:Reel |
| C3216X7R1E105K/1.60 | 功能描述:多層陶瓷電容器MLCC - SMD/SMT 1uF 10% 25Volts RoHS:否 制造商:American Technical Ceramics (ATC) 電容:10 pF 容差:1 % 電壓額定值:250 V 溫度系數(shù)/代碼:C0G (NP0) 外殼代碼 - in:0505 外殼代碼 - mm:1414 工作溫度范圍:- 55 C to + 125 C 產(chǎn)品:Low ESR MLCCs 封裝:Reel |
| C3216X7R1E105K/10 | 制造商:TDK CORPORATION OF AMERICA 功能描述:MLCC |
| C3216X7R1E105K/8 | 功能描述:CAP CER 1UF 25V 10% X7R 1206 RoHS:是 類別:電容器 >> 陶瓷 系列:C 標(biāo)準(zhǔn)包裝:4,000 系列:- 電容:1000pF 電壓 - 額定:50V 容差:±10% 溫度系數(shù):X7R 安裝類型:表面貼裝，MLCC 工作溫度:-55°C ~ 125°C 應(yīng)用:自動 額定值:AEC-Q200 封裝/外殼:0805（2012 公制） 尺寸/尺寸:0.079" L x 0.047" W（2.00mm x 1.20mm） 高度 - 座高（最大）:- 厚度（最大）:- 引線間隔:- 特點(diǎn):- 包裝:帶卷 (TR) 引線型:- |
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