LM3533 Datasheet, PDF (27/53 Pages) Texas Instruments – Complete Lighting Power Solution for Smartphone Handsets

LM3533
8. The 12th through 26th average periods the ALS voltage averages to Zone 2. The Averager Output remains at Zone 2. At the
start of average period #19 the Averager Output has shown the required 8 average period delay from the initial change from
Zone 4 to Zone 2. As a result the backlight current is programmed to Zone 2's target current.
FIGURE 13. ALS Down-Delay Control
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Pattern Generator
The LM3533 contains 4 programmable pattern generators (one for each low-voltage control bank). Each pattern generator has the
ability to drive a unique programmable pattern. Each pattern generator has its own set of registers available for pattern programming.
The programmable patterns are : delay time, rise time, fall time, high period, low period, high current and low current (see Figure
14).
FIGURE 14. Pattern Generator Timing
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