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參數(shù)資料
| 型號(hào)： | LM3570SDX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Low Noise White LED Driver System |
| 中文描述： | LED DISPLAY DRIVER, DSO14 |
| 封裝： | 4 X 3 MM, 0.80 MM HEIGHT, LLP-14 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 352K |
| 代理商： | LM3570SDX |
Detailed Block Diagram
20085003
Circuit Description
The LM3570 is a low noise white LED driver system. The LM3570 system revolves around a highly efficient regulated three
halves CMOS charge pump producing a output voltage (V
) of 4.35V. For input voltages between 3.0V to 5.5V, regulation of
the output voltage is achieved through the use of a pre-regulation loop that produces a stable output voltage while also minimizing
conducted noise on the input rail. For voltages between 2.7V and 3.0V, the LM3570 behaves like an open loop 3/2 charge pump
where the output will be 1.5X the input voltage minus the losses associated with the output resistance (R
OUT
≈
4
).
Connected to the regulated output are three internal tightly matched current sources ideal for driving white LEDs. The amount of
current driven through the LEDs is user selectable through the use of one external R
resistor. Current matching between
adjacent outputs on the LM3570 is +/-0.3%(typ.) allowing for uniform brightness across the LEDs. The LM3570 is capable of
delivering up to 80mA of total output current. Current may be pulled out of the dedicated current outputs (I
) or from V
. The
fixed output voltage rail is ideal for driving keypad LEDs in voltage mode through the use of external current limit resistors.
L
www.national.com
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3578 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Switching Regulator |
| LM3578A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Switching Regulator |
| LM3578AM | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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(fēng)格:SMD/SMT |
| LM3578AM | 制造商:Texas Instruments 功能描述:SWITCHED MODE REG SMD 3578 SOIC8 |
| LM3578AM/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 SWITCHING REGULATOR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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(fēng)格:SMD/SMT |
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