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LP3954TL/NOPB bảng dữ liệu(PDF) 41 Page - Texas Instruments

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tên linh kiện LP3954TL/NOPB
Giải thích chi tiết về linh kiện  Advanced Lighting Management Unit
PDF  60 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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LP3954TL/NOPB bảng dữ liệu(HTML) 41 Page - Texas Instruments

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background image
MCU
WLED1
WLED2
WLED3
WLED4
WLED5
WLED6
R1
G1
B1
R2
G2
B2
FLASH_EN
FLASH
IRGB
IRT
ASE
IFLASH
SW
BATTERY
FB
VDDA
VREF
D1
VDD2
VDD1
GNDS
SCK/SCL
SI
SS/SDA
SO
SYNC/PWM
IF_SEL
VDDIO
VBAT
AUDIO
COUT
10 éF
L1
4.7 éH
CIN
10 éF
CVDD1
100 nF
IMAX = 300...400 mA
VOUT = 4...5.3V
CVDDA
1 é
F
CREF
100 nF
RRGB
RRT
CVDDIO
100 nF
+
-
+
-
VDDA
R3
100k
R4
100k
R1
10k
R2
100k
C2
10 nF
C1
100 nF
LMV321
LP3954
www.ti.com
SNVS340D – JUNE 2005 – REVISED MARCH 2013
EXAMPLE 4
•
MAIN BACKLIGHT
•
SUB BACKLIGHT
•
AUDIO SYNCHRONIZED FUNLIGHTS
•
RGB INDICATION LIGHT
There may be cases where the audio input signal going into the LP3954 is too weak for audio synchronization. This
figure presents a single-supply inverting amplifier connected to the ASE input for audio signal amplification. The
amplification is +20 dB, which is well enough for 20 mVp-p audio signal. Because the amplifier (LMV321) is operating
in single supply voltage, a voltage divider using R3 and R4 is implemented to bias the amplifier so the input signal is
within the input common-mode voltage range of the amplifier. The capacitor C1 is placed between the inverting input
and resistor R1 to block the DC signal going into the audio signal source. The values of R1 and C1 affect the cutoff
frequency, fc = 1/(2*Pi*R1*C1), in this case it is around 160 Hz. As a result, the LMV321 output signal is centered
around mid-supply, that is VDDA/2. The output can swing to both rails, maximizing the signal-to-noise ratio in a low
voltage system
Figure 46. Using Extra Amplifier
Copyright © 2005–2013, Texas Instruments Incorporated
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Product Folder Links: LP3954



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