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LP8555 датащи(PDF) 51 Page - Texas Instruments

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номер детали LP8555
подробное описание детали  LP8555 High-Efficiency LED Backlight Driver for Tablet PCs
PDF  64 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LP8555 датащи(HTML) 51 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
SDA
SCL
VDDIO
RPULL-UP
INT
RPULL-UP
LCD Display
COUT_B
CIN_B
COUT_A
CIN_A
LP8555
www.ti.com
SNVS857 – FEBRUARY 2014
9.2.2 Application Example With Different LED Configuration for Each Bank
In the following example schematic it is shown how the LED banks can have different LED configuration. Bank A
has 4 active LED outputs and Bank B has 5 active LED outputs. LP8555 will automatically detect open outputs
and adjust phase shifting for both banks optimally. Control in this example is from I2C bus and PWM/INT terminal
is used for interrupt signal, notifying processor on possible fault conditions. Component selection and
performance plots follow the examples shown in first application example with default EPROM configuration, but
the PSPWM is adjusted based on the number of connected strings. 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.
9.2.2.1 Schematic
Figure 49. Application Example With Different LED Configurations on Each Bank
Copyright © 2014, Texas Instruments Incorporated
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Product Folder Links: LP8555



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