A S 3 8 3 4

4 c h a n n e l h i g h - p re c i s i o n L E D c o n t r o l l e r f o r 3 D - L C D b a c k l i g h t w i t h

i n t e g ra t e d s t e p - u p c o n t r o l l e r

www.austriamicrosystems.com/AS3834

Revision 1.6

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D a t a s h e e t

1 General Description

The AS3834 is a 4 channel high precision LED controller with PWM

inputs for driving external bipolar transistors in LCD-backlight panels,

optimized for 2D and 3D operation.

The integrated step-up controller provides the necessary output

voltage for the LED string supply.

The SMPS feedback control optimizes the power efficiency by

adjusting the LED string supply voltage.

Build in safety features include under-voltage and thermal shutdown

as well as open and short LED detection.

2 Key Features

4 channel LED controller

Step-up controller optimized for 2D/3D mode

Supply voltage range: 12V to 50V

Figure 1. AS3834

Output current up to 270mA per channel

Absolute current accuracy +/- 0.8%

Channel to channel accuracy+/- 0.6%

4 separated PWM inputs

Open LED detection and disconnect

Short LED protection and auto-turnoff

Undervoltage shutdown

Temperature shutdown

Temperature supervision of external BJT

BJT Beta compensation

SMPS feedback control

DCDC Softstart Function

Over Voltage Protection (OVP)

Package SOIC-28, TQPF-32

Package

3 Applications

LED backlighting for 3D-LCD backlight TV sets and monitors