LP8555 datasheet(51/64 Pages) TI1

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LP8555

SW_A

FB_A

VLDO

GNDs

EN/VDDIO

ISET/SCL

PWM/INT

LEDA1

LEDA2

LEDA3

LEDA4

LEDB3

LEDB4

7 - 28V

2.7V ± 20V

CVLDO

VDD

VBATT

FSET/SDA

LEDB5

LEDB6

SW_B

FB_B

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

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

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