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參數(shù)資料
| 型號： | LM3407MY |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs |
| 中文描述： | LED DISPLAY DRIVER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 321K |
| 代理商： | LM3407MY |
PRINTED CIRCUIT BOARD DESIGN
Since the copper traces of PCBs carry resistance and para-
sitic inductance, the longer the copper trace, the higher the
resistance and inductance. These factors introduce voltage
and current spikes to the switching nodes and may impair cir-
cuit performance. To optimize the performance of the
LM3407, the rule of thumb is to keep the connections between
components as short and direct as possible. Since true aver-
age current regulation is achieved by detecting the average
switch current, the current setting resistor R
must be lo-
cated as close as possible to the LM3407 to reduce the
parasitic inductance of the copper trace and avoid noise pick-
up. The connections between the LX pin, rectifier D1, inductor
L1, and output capacitor C
should be kept as short as
possible to reduce the voltage spikes at the LX pin. It is rec-
ommended that C
, the output filter capacitor for the inter-
nal linear regulator of the LM3407, be placed close to the VCC
pin. The input filter capacitor C
IN
should be located close to
L1 and the cathode of D1. If C
is connected to the VIN pin
by a long trace, a 0.1μF capacitor should be added close to
VIN pin for noise filtering. In normal operation, heat will be
generated inside the LM3407 and may damage the device if
no thermal management is applied. For more details on
switching power supply layout considerations see Application
Note AN-1149: Layout Guidelines for Switching Power Sup-
plies.
30046626
FIGURE 7. Typical Application Schematic for 6 LEDs
30046627
FIGURE 8. Typical Application Schematic for 1 LED
13
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3407MY/NOPB | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 350MA,CONST CRNT OUT SWITCHING CONVERTER RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| LM3407MYX | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4.5V to 30V 8-Pin MSOP EP T/R |
| LM3407MYX/NOPB | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| LM3409 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PFET Buck Controller for High Power LED Drives |
| LM3409_10 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PFET Buck Controller for High Power LED Drives |
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