LM3533 datasheet(13/63 Pages) TI1

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HVLED1

Outputs

Control

Banks

BANK A

ALS

Engine

ALS

Processing

ALS

Sensor

Input

Environmental

Stimulus

PWM

Filter

PWM

Input

HVLED2

Pattern 1

Pattern 2

Pattern 3

Usable

Stimulus

LVLED1

Ambient to

Brightness

Mappers

INT

Interrupt

Output

Pattern 4

BANK B

BANK C

BANK D

BANK E

BANK F

(Assigned to Control banks)

LVLED2

LVLED3

LVLED4

LVLED5

ALSM 2

ALSM1

ALSM 3

LM3533

www.ti.com

SNOSC68C – APRIL 2012 – REVISED SEPTEMBER 2015

Feature Description (continued)

Figure 22. Functional Control Diagram

7.4 Device Functional Modes

7.4.1 High-Voltage Boost Converter

The high-voltage boost converter provides power for the two high-voltage current sinks (HVLED1 and HVLED2).

The boost circuit operates using a 4.7-µH to 22-µH inductor and a 1-µF output capacitor. The selectable 500-kHz

or 1-MHz switching frequency allows for the use of small external components and provides for high boost-

converter efficiency. Both HVLED1 and HVLED2 feature an adaptive current regulation scheme where the

feedback point (HVLED1 or HVLED2) is regulated to a minimum of 400 mV. When there are different voltage

requirements in both high-voltage LED strings (string mismatch), the LM3533 regulates the feedback point of the

highest voltage string to 400 mV and drop the excess voltage of the lower voltage string across the lower strings

current sink.

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