AS3694

AS3694 Product Brief www.DataSheet4U.com AS3694 12 channel high precision LED driver for LCD backlight and 3 DCDC Step Up controller Product Brief 1 General Description The AS3694 is a 12 cannels high precision LED driver with build in PWM generators for building backlight panels in LCD-TV-sets. 3 DCDC Step Up controllers can be used to build the power supplies for red, green and blue LED strings. External clock and synchronizing inputs allow the synchronization of the LCD backlight with the TV picture. Local dimming and scan dimming is supported by 12 independent PWM generators with programmable delay, period and duty cycle. Three free configurable dynamic power feedback circuits make the device usable for white LED as well as RGB backlights. Build in safety features include thermal shutdown as well as open and short LED detection. All circuit parameters are programmable via I2C or SPI interface. ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ Output slew rate limited to reduce EMI Current programmable with external resistor 12 independent PWM generators with 12 bit resolution H-Sync, F-Sync inputs to synchronize with TVset Three independent power feedback for R-, G-, B-supply regulation Build in 5V shunt regulator I2C or SPI interface with 6 bit address Fault interrupt output Open LED detection Short LED detection Temperature shutdown 3 DCDC Step Up controller ƒ Current mode ƒ Efficiency > 90% ƒ Input voltage range 15V to 50V ƒ Output voltage up to 50V / 200mA 2 Key Features ƒ ƒ ƒ ƒ 12 indep...