LM3532TMX-40ASLASHNOPB datasheet(21/47 Pages) TI1

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VALS_

Enable ALS

Zone 4

Zone 3

Zone 2

Zone 1

Zone 0

Current Average Zone

*Note:it takes a full

average period to

generate an averager

output value

ILED

Zone 4 Brightness Target

Averager Ouput

ALS Fast Start-Up

Average

Period #

LED Current Run Time

Ramp Down

Zone 3 Brightness Target

Zone 2 Brightness Target

Zone 1 Brightness Target

Zone 4 Brightness Target

LED Current Run

Time Ramp Up

LM3532

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SNVS653D – JULY 2011 – REVISED JUNE 2013

9. The 8th average period the ALS voltage averages to Zone 3. The Averager Output changes from Zone 2 to

Zone 3.

10. The 9th average period the ALS voltage averages to Zone 3. The Averager Output remains at Zone 3. Since

this is the 3rd average period that the Averager Output has shown a change in the increasing direction from

the initial Zone 1, the backlight current is forced to change to the current Averager Output (Zone 3's) target

current.

11. The 10th average period the ALS voltage averages to Zone 4. The Averager Output remains at Zone 3.

12. The 11th average period the ALS voltage averages to Zone 4. The Averager Output changes to Zone 4.

13. The 12th average period the ALS voltage averages to Zone 4. The Averager Output remains at Zone 4.

14. The 13th average period the ALS voltage averages to Zone 4. The Averager Output remains at Zone 4.

Since this is the 3rd average period that the Averager Output has shown a change in the increasing direction

from the initial Zone 3, the backlight current is forced to change to the current Averager Output (Zone 4's)

target current.

Figure 36. Direct ALS Control

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