Description

The AS3695A is a 16 channels precision LED driver for use in LCD-backlight panels.

Dynamic power feedback controls the external power supply to guarantees best efficiency. Build in safety features include thermal shutdown as well as open and short LED detection. The device is programmable via serial interface

Key Features

• 16 Channel LED driver
• Output voltage max. 30V
• Output current 120mA
• Linear current setting using 10-bit DAC
• Current accuracy ±0.5% @ VDAC=250mV
• Channel to Channel current accuracy ±0.2%
• Output slew rate programmable
• Current programmable with external resistor
• Digital current control with 16 independent PWM generators
• PWM-generator clock
• Internal RC-oscillator
• External Clock
• H-Sync, V-Sync inputs to synchronize with TV-set
• Direct PWM mode
• Undervoltage detection ( open LED )

• Undervoltage auto-turnoff
• Overvoltage detection ( short LED )
• Overvoltage auto-turnoff
• Temperature shutdown
• Register lock/unlock function
• Fault interrupt output
•  2 configurable supply regulation feedback outputs
• SPI interface
• 4kV ESD at voltage sense inputs
•  2kV ESD an all other pins
• Package QFN48 7x7mm, 0.5mm pitch

Applications

LED backlighting for LCD – TV sets and monitors

Block diagram for AS3695A - 16 channel white LED driver for LCD Backlight