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參數(shù)資料
| 型號： | LM34910SD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 1.5 A SWITCHING REGULATOR, DSO10 |
| 封裝： | 4 X 4 MM, LLP-10 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 583K |
| 代理商： | LM34910SD |
Applications Information
(Continued)
C4:
The recommended value for C4 is 0.022 μF. A high
quality ceramic capacitor with low ESR is recommended as
C4 supplies a surge current to charge the buck switch gate
at turn-on.Alow ESR also helps ensure a complete recharge
during each off-time.
C6:
The capacitor at the SS pin determines the softstart
time, i.e. the time for the reference voltage at the regulation
comparator, and the output voltage, to reach their final value.
The time is determined from the following:
PC BOARD LAYOUT
The LM34910 regulation, over-voltage, and current limit
comparators are very fast, and respond to short duration
noise pulses. Layout considerations are therefore critical for
optimum performance. The layout must be as neat and
compact as possible, and all of the components must be as
close as possible to their associated pins. The current loop
formed by D1, L1, C2 and the S
and I
pins should be
as small as possible. The ground connection from C2 to C1
should be as short and direct as possible.
If it is expected that the internal dissipation of the LM34910
will produce excessive junction temperatures during normal
operation, good use of the PC board’s ground plane can help
considerably to dissipate heat. The exposed pad on the
bottom of the IC package can be soldered to a ground plane,
and that plane should extend out from beneath the IC, and
be connected to ground plane on the board’s other side with
several vias, to help dissipate the heat. The exposed pad is
internally connected to the IC substrate. Additionally the use
of wide PC board traces, where possible, can help conduct
heat away from the IC. Judicious positioning of the PC board
within the end product, along with the use of any available air
flow (forced or natural convection) can help reduce the junc-
tion temperatures.
L
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM34910SD/NOPB | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM34910SDX | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM34910SDX/NOPB | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM34914 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Ultra Small 1.25A Step-Down Switching Regulator with Intelligent Current Limit |
| LM34914EVAL | 功能描述:電源管理IC開發(fā)工具 LM34914 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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