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參數資料
| 型號： | LM3570SD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅動器 |
| 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： | 9/13頁 |
| 文件大?。?/td> | 352K |
| 代理商： | LM3570SD |
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
相關PDF資料 |
PDF描述 |
|---|---|
| LM3570SDX | Low Noise White LED Driver System |
| LM358 | Dual Operation Amplifiers |
| LM358CS | Voltage-Feedback Operational Amplifier |
| LM2904DBLE | Voltage-Feedback Operational Amplifier |
| LM2904S | Voltage-Feedback Operational Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM3570SD/NOPB | 功能描述:IC LED DRIVR WHITE BCKLGT 14-LLP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅動器 系列:PowerWise® 標準包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓撲:PWM，切換式電容器（充電泵） 輸出數:1 內部驅動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應商設備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| LM3570SDX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Noise White LED Driver System |
| 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/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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