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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)： | 8/16頁 |
| 文件大?。?/td> | 321K |
| 代理商： | LM3407MY |
30046619
FIGURE 1. Operating Waveforms of a Floating Buck Converter
PULSE LEVEL MODULATION (PLM)
The LM3407 incorporates the innovative Pulse Level Modu-
lation technique. With an external 1% thick film resistor con-
nected to the ISNS pin, the converter output voltage can
adjust automatically as needed to deliver constant current
within 10% accuracy to a serially connected LED string of dif-
ferent number and type. Pulse Level Modulation is a novel
method to provide precise constant current control with high
efficiency. It allows the use of low side current sensing and
facilitates true average output current regulation regardless
of the input voltage and inductor value. Pulse Level Modula-
tion can be treated as a process that transforms a trapezoidal
pulse chain into a square pulse chain with an amplitude equal
to the center of inductor current ramp.
Figure 2
shows the
waveform of the converter in steady state. In the figure, I
is
the inductor current and I
is the switch current into the LX
pin. V
ISNS
is the voltage drop across the current sensing re-
sistor R
. V
is the center of the inductor current ramp
and is a reference pulse that is synchronized and has an
identical pulse width to V
ISNS
.
www.national.com
8
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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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