LP3954 Datasheet, PDF (42/60 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
EXAMPLE 5
+
-
C_IN
C_VDD1
10 éF 100 nF
BATTERY
C_VDDA
1 éF
C_REF
100 nF
R_RGB
R_RT
MCU
C_VDDIO
100 nF
L1
4.7 éH
SW
V_DD2
V_DD1
V_DDA
V_REF
IRGB
IRT
SO
SI
SCK/SCL
SS/SDA
SYNC/PWM
VDDIO
IF_SEL
PWM
AUDIO
SIGNAL R1
10k
FLASH_EN
R2
10k
C3
10 nF
C1
10 nF
ASE
C2
10 nF
GNDS
D1
FB
WLED1
WLED2
WLED3
WLED4
WLED5
WLED6
R1
G1
B1
R2
G2
B2
FLASH
IFLASH
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I_MAX = 300...400 mA
V_OUT = 4...5.3V
C_OUT
10 PF
VBAT
• MAIN BACKLIGHT
• SUB BACKLIGHT
• AUDIO SYNCHRONIZED FUNLIGHTS
• RGB INDICATION LIGHT
Here, a second order RC-filter is used on the ASE input to convert a PWM signal to an analog waveform.
Figure 47. Using PWM Signal
More application information is available in the document "LP3954 Evaluation Kit".
42
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