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LP8555 Datasheet(PDF) 52 Page - Texas Instruments

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Part # LP8555
Description  LP8555 High-Efficiency LED Backlight Driver for Tablet PCs
PDF  64 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8555 Datasheet(HTML) 52 Page - Texas Instruments

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LP8555
SW_A
FB_A
VLDO
GNDs
EN/VDDIO
ISET/SCL
PWM/INT
LEDA1
LEDA2
LEDA3
LEDA4
LEDB3
LEDB4
L1
D1
7 - 28V
2.7V ± 20V
CVLDO
VDD
VBATT
FSET/SDA
LEDB5
LEDB6
SW_B
FB_B
L2
D2
2.7V ± 20V
VBATT
LEDA5
LEDA6
LEDB1
LEDB2
1.3 ”9OUT / VIN ”10
VOUT_A
7 - 28V
1.3 ”9OUT / VIN ”10
VOUT_B
CVDD
EN
PWM
RISET
RFSET
COUT_B
CIN_B
COUT_A
CIN_A
LCD Display
LP8555
SNVS857 – FEBRUARY 2014
www.ti.com
9.2.3 Application Example With 12 LED Strings and PWM Input Brightness Control
In the following example schematic it is shown how the LP8555 can be configured for operating without I2C
control. Only controls needed are PWM input for brightness control and EN for enabling and disabling device.
PWM frequency is set with RFSET resistor and LED current is set with ISET resistor. Full 12 channels are used in
this example, but other configurations can be used as well. Component selection and performance plots follow
the examples shown in first application example with default EPROM configuration. Details on I2C registers and
EPROM settings are seen in the Register Map section. If custom EPROM is required, please contact TI Sales
representative for availability. Since this configuration relies on pre-programmed EPROM for basic setup
(although LED current and PWM frequency are set with resistors), special EPROM configuration is needed for
this application.
9.2.3.1 Schematic
Figure 50. Application Example with 12 LED Strings and PWM Input Brightness Control
52
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Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: LP8555



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