• Precision Measurement Technologies
  • Technology Center for

AS3691 LED Driver

4 Precision 400mA Current Source for RGB and Single Color LEDs

The AS3691 features four high precision current sources for driving 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.

Block Diagram of the AS3691 LED Driver

(Click to Enlarge)

Key Features

  • 4 x 400mA constant current outputs
  • Programmable with external resistors
  • 4 independent PWM inputs
  • Absolute current accuracy ± 0.5%
  • Automatic Supply Regulation to reduce power dissipation

AS3691 Applications

  • General Lighting
  • Backlighting
  • RGB Backlighting for LCD
  • White Color Balancing

AS3691 Product Facts

Outputs [#] 4
LED current per output [mA] 400
Features Slew rate contr.
Error detection
Read-back
LED-to-LED matching [%] 0.5
Supply voltage [V] Main Supply
Package QFN24 or
ePTSSOP24