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參數資料
| 型號： | LM2707MFX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅動器 |
| 英文描述： | Inductive-Boost Series LED Driver with Programmable Oscillator Frequency |
| 中文描述： | LED DISPLAY DRIVER, PDSO8 |
| 封裝： | SOT-23, 8 PIN |
| 文件頁數： | 1/19頁 |
| 文件大?。?/td> | 1039K |
| 代理商： | LM2707MFX |
LM2707
Inductive-Boost Series LED Driver with Programmable
Oscillator Frequency
General Description
The LM2707 is a magnetic boost regulator specifically de-
signed for white LED drive applications. Tightly regulated
LED currents, exceptional LED brightness uniformity, and
very high LED-drive power efficiency (
>
80%) can all be
achieved by stacking the LEDs in series between the
LM2707 output and the low-voltage feedback pin (0.515V).
The LM2707 requires only a few small external components.
A small inductor with a low saturation current rating can
safely be used because the tightly controlled current limit
circuit prevents large inductor current spikes, even at start-
up. The output capacitor can also be small due to the tightly
controlled output over-voltage protection circuit.
The LM2707 is an excellent choice for display backlighting
and other general-purpose lighting functions in battery pow-
ered applications. The 2.3V-to-7V input voltage range of the
device easily accommodates single-cell Lithium-Ion batter-
ies and battery chargers.
The LM2707 features 18V output capability, PFM regulation,
and a high-current switching transistor (400mA peak). These
characteristics allow the part to drive a series string of 2-to-4
LEDs with forward currents between 0 and 40mA. LED
brightness can be adjusted dynamically simply by applying a
PWM signal to the enable (EN) pin. The PWM signal can be
as fast as 50kHz because the LM2707 has a fast turn-on
time.
In addition to LED-drive applications, the LM2707 can also
be used as a general purpose DC-DC voltage regulator in
boost converter applications.
The LM2707 is available in a SOT23-8 surface mount pack-
age.
Features
n
Excellent LED Drive Capability:
3 LED String: 30mA
4 LED String: 20 mA
6 LEDs (2 strings of 3): 15 mA
n
Very High LED Drive Efficiency:
>
80%
n
Low Feedback Voltage: 515mV
n
Low-Resistance NMOS Power Switch: 0.6
n
High-Speed PWM Brightness Control Capability
n
Over-Voltage Protection (18V min, 19V typ, 20V max)
n
Inrush and Inductor Current Limiting
n
2.3V - 7V Input Voltage Range
n
Requires Only a Few External Components
n
No External Compensation Needed
n
Programmable Oscillator Frequency
n
ON/OFF Pin
n
Small SOT23-8 Package
Applications
n
White LED Drive for Display Backlights
n
LED Flashlights
n
General Purpose LED Lighting
n
Step-up DC/DC Voltage Conversion
Typical Application Circuit
20099225
February 2005
L
2005 National Semiconductor Corporation
DS200992
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2707MFX/NOPB | 功能描述:IC LED DRVR WHITE BCKLGT SOT23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅動器 系列:- 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 |
| LM2708HTLX-1.57/NOPB | 制造商:Texas Instruments 功能描述: |
| LM270WF5-SLM1 | 制造商:LG.Philips Lcd 功能描述:27" FHD,1920X1080,250 NITS, LVDS, 72% IPS - Bulk |
| LM270WQ1-SDDB | 制造商:LG Corporation 功能描述:27" 2560X1440, 380 NITS LED |
| LM270WQ1-SLC2 | 制造商:LG.Philips Lcd 功能描述:27" QHD 2560X1440 350NIT LVDS, SRGB IPS - Bulk |
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