LP8553 datasheet(33/41 Pages) TI2

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LP8553

www.ti.com

SNVS701B – SEPTEMBER 2011 – REVISED JANUARY 2014

EEPROM ADDRESS 3 register

UVLO

7:6

R/W

00 = Disabled

01 = 2.7V

10 = 5.4V

11 = 8.1V

EN_PSPWM

R/W

Enable phase shift PWM scheme

0 = phase shift PWM disabled, normal PWM mode used

1 = phase shift PWM enabled

PWM_FREQ

4:0

R/W

PWM output frequency setting. See table in PWM Frequency Setting for full

description of selectable PWM frequencies.

EEPROM Address 4

Address A4h

EEPROM ADDRESS 4 register

PWM_RESOLUTION[1:0]

EN_I_RES

LED_FAULT_THR

I_SLOPE[0]

DRV_HEADR[2:0]

Name

Bit

Access

Description

PWM

7:6

R/W

PWM output resolution selection. Actual resolution depends also on the output

RESOLUTION

frequency. See PWM Frequency Setting for full description.

00 = 8...10 bits (19.2 kHz...4.8 kHz)

01 = 9...11 bits (19.2 kHz... 4.8 kHz)

10 = 10...12 bits (19.2 kHz...4.8 kHz)

11 = 11...13 bits (19.2 kHz...4.8 kHz)

EN_I_RES

R/W

Enable LED current set resistor

0 = Resistor is disabled and current is set only with CURRENT EEPROM register bits

1 = Enable LED current set resistor. LED current is defined by the RISET resistor and the

CURRENT EEPROM register bits.

LED_FAULT_T

R/W

LED fault detector thresholds. VSAT is the saturation voltage of the driver, typically 200

mV.

0 = 3.3V

1 = 5.3V

I_SLOPE[0]

R/W

Current slope I_SLOPE[1:0] trim bits adjust the constant current level of PWM control

range in the PWM & current control mode. See I_SLOPE[1] bit description in EEPROM

Address 2 table.

DRV_HEADR

2:0

R/W

LED output driver headroom control. VSAT is the saturation voltage of the driver, typically

200 mV.

000 = VSAT + 125 mV

001 = VSAT + 250 mV

010 = VSAT + 375 mV

011 = VSAT + 500 mV

100 = VSAT + 625 mV

101 = VSAT + 750 mV

110 = VSAT + 875 mV

111 = VSAT + 1000 mV

EEPROM Address 5

Address A5h

EEPROM ADDRESS 5 register

EN_VSYNC

DITHER[1:0]

VBOOST[4:0]

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