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LP5520 Scheda tecnica(PDF) 33 Page - Texas Instruments

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Il numero della parte LP5520
Spiegazioni elettronici  RGB Backlight LED Driver
PDF  46 Pages
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

LP5520 Scheda tecnica(HTML) 33 Page - Texas Instruments

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LP55XX
CALIBRATION
MEMORY
SPI/I2C
INTER-
FACE
BOOST
ADC
COLOR AND
BRIGHTNESS
PWM LOGIC
LED
DRIVERS
MCU
WITH
I2C
OR
SPI
COUT
CVDDA
CVDDD
100 nF
4.7 PF
CIN
2.9 ± 5.5V
5 ± 20V
FB
SW
100 nF
2 x
4.7 PF
4.7 PH
L1
ROUT
LP5520
VDDA
VDDD
S1_IN
S2_IN
PWMR
PWMG
PWMB
VLDO
NRST
SS/SDA
SCK/SCL
SI/A0
SO
IFSEL
CVDDIO
100 nF
VDDIO
CVLDO
1 PF
BRC
GND
LM 20
VLDO
GOUT
BOUT
D1
33
LP5520
www.ti.com
SNVS440B – MAY 2007 – REVISED MARCH 2016
Product Folder Links: LP5520
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LP5520 is an RGB backlight LED driver for small format color LCDs. The device has a magnetic boost
converter that creates an up to 20-V LED supply voltage from the battery voltage. Three current sinks can drive
up to 60 mA of current per string. Figure 32 and Figure 35 show the connections when using LP5520 in
automatic mode and in stand-alone mode.
8.2 Typical Applications
8.2.1 Typical Application: I2C-Bus Control
In this typical application LP5520 is controlled with an I2C bus. Operation mode is automatic without external
PWM control.
Figure 32. LP5520 Typical I2C-Bus Application



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