AS3693B datasheet(2/33 Pages) AMSCO

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AS3693B

austriami crosyst ems

www.austriamicrosystems.com

Revision 1.21 / 2011-09-30

1 - 32

General Description

The AS3693B is a 16 channels high precision LED

controller with build in PWM generators for driving

external FETs in LCD-backlight panels.

External clock and synchronizing inputs allow the

synchronization of the LCD backlight with the TV

picture. Local dimming and scan dimming is

supported by 16 independent PWM generators with

programmable delay, period and duty cycle. Three

free configurable dynamic power feedback circuits

make the device usable for white LED as well as

RGB backlights. Build in safety features include

thermal shutdown as well as open and short LED

detection. All circuit parameters are programmable

via I2C or SPI interface.

Key Features

16 Channel LED driver

Output current only limited by external

transistor

Output voltage 0.4V to 50V

Absolute current accuracy +/- 0.5%

Output slew rate programmable

Current programmable with external resistor

Linear current control with 8 - bit DAC

Linear current control with external analog

voltage

Digital current control with 16 independent

PWM generators

Free programmable 12 bit resolution ( period,

high time and delay )

Overvoltage detection ( short LED )

Undervoltage detection ( open LED )

Temperature shutdown

Fault interrupt output

H-Sync, V-Sync inputs to synchronize with TV-

set

Internal or external PWM – clock

I2C interface

SPI interface

5 bit device - address (sets device address

and interface mode)

Automatic supply regulation feedback

Each output can be assigned to red, green or

blue feedback.

Package epTQFP64 and QFN64

Applications

•

LED backlighting for LCD – TV sets and

monitors

Product Specification, Confidential

AS3693B–16 Channel high precision LED driver for

LCD Backlight

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