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參數(shù)資料
| 型號： | LM3570 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | Low Noise White LED Driver System |
| 中文描述： | 低噪聲白光LED驅(qū)動器系統(tǒng) |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 352K |
| 代理商： | LM3570 |
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(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3570SD | Low Noise White LED Driver System |
| LM3570SDX | Low Noise White LED Driver System |
| LM358 | Dual Operation Amplifiers |
| LM358CS | Voltage-Feedback Operational Amplifier |
| LM2904DBLE | Voltage-Feedback Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3570A E WAF | 制造商:Texas Instruments 功能描述: |
| LM3570SD | 制造商:Texas Instruments 功能描述:IC WLED DRIVER POWERWISE LLP-14 |
| 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(qū)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(shù):1 內(nèi)部驅(qū)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(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)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 |
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