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參數(shù)資料
| 型號(hào)： | LM3407 |
| 廠(chǎng)商： | National Semiconductor Corporation |
| 英文描述： | 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs |
| 中文描述： | 350毫安，恒流輸出浮點(diǎn)高功率LED的降壓開(kāi)關(guān)轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大?。?/td> | 321K |
| 代理商： | LM3407 |
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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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| LM3407MY | 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3407_09 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs |
| LM3407_11 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:LM3407 350 mA, Constant Current Output Floating Buck Switching Converter |
| LM3407EVAL | 功能描述:BOARD EVALUATION FOR LM3407 RoHS:否 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - LED 驅(qū)動(dòng)器 系列:PowerWise® 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類(lèi)型:1，非隔離 輸出電壓:17V 特點(diǎn):可調(diào)光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關(guān)產(chǎn)品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
| LM3407EVAL/NOPB | 功能描述:電源管理IC開(kāi)發(fā)工具 LM3407 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM3407MY | 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 制造商:Texas Instruments 功能描述:BUCK SW CONVERTER, 350MA, POWERWISE |
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