AS3691_07 datasheet(2/23 Pages) AMSCO

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AS3691

Datasheet

www.austriamicrosystems.com (ptr)

Revision 2.3

1 - 22

General Description

The AS3691 (AS3691A and AS3691B) features four

high precision current sources for lighting of up to

four LED strings (RGB or single color leds). Each

of the four currents sources can be controlled

independently by PWM inputs.

The full scale

current value is set by external resistors.

Key Features

4 x up to 0.4A constant current outputs

Programmable with external resistors

4 independent PWM inputs

Absolute current accuracy +/-0.5%

’Automatic Supply Regulation’ to reduce power

dissipation

1) Patent Pending

Very wide output voltage current source

voltage compliance

−

Down to 0.41V

−

Up to 15V

Integrated overtemperature protection

Separate sense pads (Rfb1-Rfb4) for easy and

precise PCB Layout

Package

−

DIE

−

QFN24 4x4mm

−

eP-TSSOP

2) 15V is sufficient for most applications as the

AS3691 dose not switch off the LED current

completely

Applications

General Lighting

Backlighting

RGB Backlighting for LCD TV/Monitors with

White Color Balancing

Application Diagrams

Figure

1 – Application Diagram of AS3691 for Single Color Lighting

VSS

VDD

Ri1

Ri2

Ri3

Ri4

Rvdd

Cvdd

100nF

PWM

Ref

Overtemp

AS3691

VREG

VSS

ON1

ON2

ON3

ON4

CURR1

CURR2

CURR3

CURR4

RES1

RES2

RES3

RES4

UV1

UV2

UV3

UV4

RFB1

RFB2

RFB3

RFB4

Csup

100nF

Pad

Datasheet

AS3691

4 Precision 400mA Current Sources for RGB and Single Color Leds

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