AS3693B

www.austriamicrosystems.com

AS3696

4 channel white LED controller for 3D

General Description

The AS3696 is a 4 channels precision LED controller

with PWM inputs or internal PWM generator for driving

external FETs in LCD-backlight panels. Build in safety

features include thermal shutdown as well as open and

short LED detection.

2x2 Channel LED driver

Output current only limited by external FET

Build in shunt regulator

Absolute current accuracy +/- 1%

Channel to channel accuracy +/

Normal Mode

Linear current control with external voltage

Digital PWM control with PWM

Build in PWM-generator with analog duty cycle

control

3D Mode

Linear current control with external voltage

Digital PWM control with 2

1

Block Diagram

D1

S1

Vsupply

G1

D2

S2

G2

Rosc

Cosc

Vduty

3D_PWM12

3D_PWM34

3D_MODE

xPD

SEL

PWM

austriamicrosystems

Rev 1.10 / 1011-04-04

1 - 16

4 channel white LED controller for 3D-LCD backlight

precision LED controller

inputs or internal PWM generator for driving

backlight panels. Build in safety

features include thermal shutdown as well as open and

Output current only limited by external FET

%

+/- 1%

control with external voltage

Digital PWM control with PWM input

generator with analog duty cycle

control with external voltage

PWM inputs

Product

Open LED detection

Short LED detection and auto

Temperature shutdown

2x automatic supply regulation feedback

Package QFN 32pin 5x5mm

Package TQFP 32pin 7

Package SOIC 28pin

Applications

• LED backlighting for 3D- LCD

AS3696

VDD

V2_5

xFAULT FB12

FB34

EPAD

D3

S3

G3

D4

S4

G4

Reference

SMPS

feedback

Fault detectors

Oscillator

PWM control

Vset2

Vref

Vshort

Vset1

Vfb

VSS

Sel_PPTrim

16

Product specification, Preliminary

Short LED detection and auto-turnoff

Temperature shutdown

2x automatic supply regulation feedback

5x5mm, 0.5mm pitch

7x7mm, 0.8mm pitch

LCD – TV sets and monitors

Vset2

Vref

Vshort

Vset1