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LP3950

更新时间： 2024-11-16 11:13:07
品牌 Logo 应用领域
德州仪器 - TI 驱动驱动器
页数 文件大小 规格书
38页 1909K
描述
具有音频同步器的彩色 LED 驱动器

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中文翻译

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LP3950 数据手册

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LP3950  
www.ti.com  
SNVS331C –NOVEMBER 2004–REVISED APRIL 2013  
LP3950 Color LED Driver with Audio Synchronizer  
Check for Samples: LP3950  
1
FEATURES  
DESCRIPTION  
The LP3950 is a color LED driver with a built-in audio  
synchronization feature for any analog audio input  
such as polyphonic ring tones and MP3 music. LEDs  
can be synchronized to an audio signal with two  
methods - amplitude and frequency. Also several fine  
tuning options are available for differentiation  
purposes. The chip also has an unique AGC  
(Automatic Gain Control) feature which tracks the  
input signal level and automatically adjusts the gain  
to an optimal value.  
2
•
•
•
•
•
Audio Synchronization for Color LEDs with  
Two Modes: Amplitude and Frequency  
Programmable Frequency and Amplitude  
Response with Tracking Speed Control  
Automatic Gain Control or Selectable Gain for  
Input Signal Optimization  
RGB Pattern Generator Similar to  
LP3933/LP3936  
Magnetic DC-DC Boost Converter with  
Programmable Boost Output Voltage  
Selectable SPI or I2C Compatible Interface  
The LP3950 has a high efficiency magnetic DC/DC  
converter with programmable output voltage and  
switching frequency. The converter has high output  
current capability so it is also able to drive flash LEDs  
in camera phone applications.  
•
•
One Pin Default Enable for Non-Serial Interface  
Users. One Pin Selector for Synchronization  
Mode  
The LP3950 is similar to LP3933 and LP3936 in that  
the color LEDs (or RGB LEDs) can also be  
•
Space Efficient 32-Pin TLGA Package  
programmed  
to  
generate  
light  
patterns  
(programmable color, intensity, on/off timing, slope  
and blinking cycle).  
APPLICATIONS  
•
•
•
Cellular Phones  
MP3/CD/Minidisc Players  
Toys  
All functions are software controllable through a SPI  
or I2C compatible interface but the device also  
supports one pin control for enabling predefined  
(default) audio synchronization mode.  
Typical Application  
2.8V  
V
IN  
L
1
D
1
C
IN  
10 mF  
C
C
C
VDD1  
100 nF  
VDD2  
100 nF  
VDDA  
100 nF  
4.7 mH  
V
DD1  
V
DD2  
V
DDA  
C
1
ASE  
SW  
SINGLE-ENDED  
10 nF  
AUDIO SIGNAL  
FB  
R1  
G1  
B1  
R2  
G2  
B2  
RT  
C
OUT  
10 mF  
R
R1  
C
2
AD1  
R
G1  
10 nF  
DIFFERENTIAL  
AUDIO SIGNAL  
C
3
R
B1  
R2  
G2  
AD2  
R
10 nF  
LP3950  
4
SERIAL  
R
INTERFACE  
R
B2  
NRST  
R
T
MICROCONTROLLER  
PWM_LED  
IF_SEL  
82k  
VREF  
GNDs  
V
C
DD_IO  
VREF  
100 nF  
DME  
AMODE  
C
VDD_IO  
100 nF  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2004–2013, Texas Instruments Incorporated  
1234567...38

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