LP8550TLXSLASHNOPB datasheet(32/49 Pages) TI2

32 / 49 page

LP8550

SNVS657E – SEPTEMBER 2010 – REVISED SEPTEMBER 2014

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8.6.2.4 EEPROM Address 2

Address A2h

EEPROM ADDRESS 2 REGISTER

ADAPTIVE_SPEED[1:0]

ADV_SLOPE

MODE_25/50_S

EN_ADAPT

EN_BOOST

BOOST_IMAX

I_SLOPE[1]

Name

Bit

Access

Description

ADAPTIVE

R/W

Boost converter adaptive control speed adjustment

SPEED[1]

0 = Normal mode

1 = Adaptive mode optimized for light loads. Activating this helps the voltage droop with

light loads during boost / backlight start-up.

ADAPTIVE

R/W

Boost converter adaptive control speed adjustment

SPEED[0]

0 = Adjust boost once for each phase shift cycle or normal PWM cycle

1 = Adjust boost every 16th phase shift cycle or normal PWM cycle

ADV_SLOPE

R/W

Advanced slope

0 = Advanced slope is disabled

1 = Use advanced slope for brightness change to make brightness changes smooth for

eye

MODE_25/50_SEL

R/W

25% or 50% mode selection for PWM & current control

0 = 50% mode selected

1 = 25% mode selected

EN_ADAPT

R/W

Enable boost converter adaptive mode

0 = adaptive mode disabled, boost converter output voltage is set with VBOOST

EEPROM register bits

1 = adaptive mode enabled. Boost converter startup voltage is set with VBOOST

EEPROM register bits, and after start-up voltage is reached the boost converter adapts

to the highest LED string VF. LED driver output headroom is set with DRV_HEADR

EEPROM control bits.

EN_BOOST

R/W

Enable boost converter

0 = boost is disabled

1 = boost is enabled and turns on automatically when backlight is enabled

BOOST_IMAX

R/W

Boost converter inductor maximum current

0 = 1.4 A

1 = 2.5 A (recommended)

I_SLOPE[1]

R/W

8.6.2.5 EEPROM Address 3

Address A3h

EEPROM ADDRESS 3 REGISTER

UVLO[1:0]

EN_PSPWM

PWM_FREQ[4:0]

Name

Bit

Access

Description

UVLO

7:6

R/W

00 = Disabled

01 = 2.7 V

10 = 5.4 V

11 = 8.1 V

EN_PSPWM

R/W

Enable phase shift PWM scheme

0 = PSPWM disabled, normal PWM mode used

1 = PSPWM enabled

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