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參數(shù)資料
| 型號(hào)： | LM3557SD-2 |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Step-Up Converter for White LED Applications |
| 中文描述： | 1.1 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 1 MM HEIGHT, LLP-8 |
| 文件頁(yè)數(shù)： | 10/11頁(yè) |
| 文件大?。?/td> | 642K |
| 代理商： | LM3557SD-2 |
Application Information
(Continued)
junction capacitance magnitudes (C
J
or C
T
or C
D
) are con-
ducive to high efficiency. The chosen diode must have a
reverse breakdown voltage rating (V
R
and/or V
RRM
) that is
larger than the output voltage (V
OUT
). No matter what type of
diode is chosen, Schottky or not, certain selection criteria
must be followed:
1.
V
R
and V
RRM
>
V
OUT
2.
I
F
or I
O
≥
I
LOAD
or I
OUT
3.
I
FRM
≥
I
Lpeak
Some recommended diode manufacturers are as follows:
Vishay [www.vishay.com]
Diodes, Inc [www.diodes.com]
On Semiconductor [www.onsemi.com]
LAYOUT CONSIDERATIONS
All components, except for the white LEDs, must be placed
as close as possible to the LM3557. The die attach pad
(DAP) must be soldered to the ground plane.
The input capacitor, Cin, must be placed close to the
LM3557. Placing Cin close to the device will reduce the
metal trace resistance effect on input voltage ripple. The
feedback current setting resistor R2 must be placed close to
the Fb and Sw2 pins. The output capacitor, Cout, must be
placed close to the Ovp and Gnd pin connections. Trace
connections to the inductor should be short and wide to
reduce power dissipation, increase overall efficiency, and
reduce EMI radiation. The diode, like the inductor, should
have trace connections that are short and wide to reduce
power dissipation and increase overall efficiency. For more
details regarding layout guidelines for switching regulators
refer to Applications Note AN-1149.
L
www.national.com
10
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3557SDX-2 | Step-Up Converter for White LED Applications |
| LM3557 | Step-Up Converter for White LED Applications |
| LM3570 | Low Noise White LED Driver System |
| LM3570SD | Low Noise White LED Driver System |
| LM3570SDX | Low Noise White LED Driver System |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3557SD-2 | 制造商:Texas Instruments 功能描述:IC W LED DRIVER POWERWISE LLP-8 |
| LM3557SD-2/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3557SDX-2 | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3557SDX-2/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM3559EVAL/NOPB | 制造商:Texas Instruments 功能描述:SYNCHRONOUS BOOST FLASH DRIVER WITH DUAL - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:EVAL BOARD FOR LM3559 |
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