Description

The AS3695C is a 16 channels precision LED controller for driving external FET/BJT 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 only limited by external transistor
• Output current only limited by external transistor
• Linear current setting using 10-bit DAC
• Current accuracy ±0.5% @ VDAC=250mV
• Channel to Channel current accuracy ±0.2%
•  BJT base current compensation
• Output slew rate programmable
• Current programmable with external resistor
• Digital current control with 16 independent PWM generators
• Free programmable 12 bit resolution
  ( period, high time and delay )
• PWM-generator clock
• Internal RC-oscillator
• External Clock
• PLL-synthesized clock from external signal
• 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 QFN64 9x9mm, 0.5mm pitch
   LQFP64 14x14mm, 0.8mm pitch

Applications

LED backlighting for LCD – TV sets and monitors

Block diagram for AS3695C - 16 channel white LED controller for LCD Backlight