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參數(shù)資料
| 型號： | LM27952 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | White LED Adaptive 1.5X/1X Switched Capacitor Current Driver |
| 中文描述： | 白光LED的自適應(yīng)1.5X/1X開關(guān)電容電流驅(qū)動器 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 521K |
| 代理商： | LM27952 |
LM27952
White LED Adaptive 1.5X/1X Switched Capacitor Current
Driver
General Description
The LM27952 is a switched capacitor white-LED driver ca-
pable of driving up to 4 LEDs with 30mA through each LED.
Its 4 tightly regulated current sinks ensure excellent LED
current and brightness matching. LED drive current is pro-
grammed by an external sense resistor. The LM27952 oper-
ates over an input voltage range from 3.0V to 5.5V and
requires only four low-cost ceramic capacitors.
The LM27952 provides excellent efficiency without the use
of an inductor by operating the charge pump in a gain of 3/2,
or in a gain of 1. Maximum efficiency is achieved over the
input voltage range by actively selecting the proper gain
based on the LED forward voltage requirements.
The LM27952 uses constant frequency pre-regulation to
minimize conducted noise on the input. It has a fixed 750kHz
switching frequency optimized for portable applications. The
LM27952 consumes less than 1μA of supply current when
shut down.
The LM27952 is available in a 14-pin No-Pullback Leadless
Leadframe Package: LLP-14.
Features
n
Drives up to 4 LEDs with up to 30mA each
n
Regulated current sources with 0.2%(typ.) matching
n
3/2x, 1x Gain transition based on LED V
F
n
Peak Efficiency Over 85%
n
Input Voltage Range: 3.0V to 5.5V
n
PWM Brightness Control
n
Very Small Solution Size - NO INDUCTOR
n
Fixed 750kHz Switching Frequency
n
<
1μA Shutdown Current
n
14-pin LLP Package: 4.0mm X 3.0mm X 0.8mm
Applications
n
White LED Display Backlights
n
White LED Keypad Backlights
n
General Purpose LED Lighting
Typical Application Circuit
20148001
May 2005
L
2005 National Semiconductor Corporation
DS201480
www.national.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM27952SD | White LED Adaptive 1.5X/1X Switched Capacitor Current Driver |
| LM27952SDX | White LED Adaptive 1.5X/1X Switched Capacitor Current Driver |
| LM27961 | Dual-Display White LED Driver with 3/2x Switched Capacitor Boost |
| LM27961TL | Dual-Display White LED Driver with 3/2x Switched Capacitor Boost |
| LM27961TLX | Dual-Display White LED Driver with 3/2x Switched Capacitor Boost |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM27952SD | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM27952SD | 制造商:Texas Instruments 功能描述:LED DRIVER, SW CAP, POWERWISE, LLP-14 |
| LM27952SD/NOPB | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM27952SDX | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| LM27952SDX/NOPB | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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