LP8556 datasheet(43/63 Pages) TI1

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LP8556

www.ti.com

SNVS871I – JULY 2012 – REVISED MARCH 2016

Product Folder Links: LP8556

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8.6.2.14 CFG9

Address A9h

CFG9 REGISTER

VBOOST_MAX[2:0]

JUMP_EN

JUMP_THRESHOLD[1:0]

JUMP_VOLTAGE[1:0]

NAME

BIT

ACCESS

DESCRIPTION

VBOOST_MAX

7:5

R/W

Select the maximum boost voltage (typ values)

( VBOOST_RANGE = 0 / VBOOST_RANGE = 1)

010 = NA / 21 V

011 = NA / 25 V

100 = 21 V / 30 V

101 = 25 V / 34.5 V

110 = 30 V / 39 V

111 = 34 V / 43 V

JUMP_EN

R/W

Enable JUMP detection on the PWM input.

JUMP_THRESHOLD

3:2

R/W

Select JUMP threshold:

00 = 10%

01 = 30%

10 = 50%

11 = 70%

JUMP_VOLTAGE

1:0

R/W

Select JUMP voltage:

00 = 0.5 V

01 = 1 V

10 = 2 V

11 = 4 V

8.6.2.15 CFGA

Address AAh

CFGA REGISTER

SSCLK_EN

RESERVED

ADAPTIVE

DRIVER_HEADROOM[2:0]

NAME

BIT

ACCESS

DESCRIPTION

SSCLK_EN

R/W

Enable spread spectrum function

RESERVED

R/W

RESERVED

5:4

R/W

ADAPTIVE

R/W

Enable adaptive boost control

DRIVER_HEADROOM

2:0

R/W

LED driver headroom control. This sets the LOW comparator threshold and

contributes to the MID comparator threshold.

000 = HEADROOM_OFFSET + 875 mV

001 = HEADROOM_OFFSET + 750 mV

010 = HEADROOM_OFFSET + 625 mV

011 = HEADROOM_OFFSET + 500 mV

100 = HEADROOM_OFFSET + 375 mV

101 = HEADROOM_OFFSET + 250 mV

110 = HEADROOM_OFFSET + 125 mV

111 = HEADROOM_OFFSET mV

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