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AS3695A Datasheet(PDF) 2 Page - ams AG |
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AS3695A Datasheet(HTML) 2 Page - ams AG |
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2 / 34 page  AS3693B www.austriamicrosystems.com AS3695A 16 channel white LED driver for LCD backlight General Description The AS3695A is a 16 channels precision LED use in LCD-backlight panels. Dynamic power feedback controls the external power supply to guarantee best efficiency. Build in safety features include thermal shutdown as well as open and short LED detection. The device is programmable via serial interface. 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 Free programmable 12 bit resolution ( period, high time and delay ) 1 Block diagram austriamicrosystems Rev 1.10 / 2010-12-8 1 - 33 16 channel white LED driver for LCD backlight eneral Description is a 16 channels precision LED driver for Dynamic power feedback controls the external power supply to guarantee best efficiency. Build in safety include thermal shutdown as well as open and detection. The device is programmable via bit DAC Current accuracy ±0.5% @ VDAC=250mV accuracy ±0.2% Output slew rate programmable Current programmable with external resistor control with 16 independent PWM 12 bit resolution Product Specifica PWM-generator clock Internal RC-oscillator External Clock H-Sync, V-Sync inputs to Direct PWM mode Undervoltage detection ( 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 6kV ESD at current sink 2kV ESD an all other pins Package QFN48 7x7mm, 0.5 Applications LED backlighting for LCD monitors AS3695A PWM CURR1 PWM PWM PWM PWM PWM PWM PWM PWM PWM PWM PWM PWM PWM PWM PWM VDD VDD V2_5 CURR2 CURR3 CURR4 RES1 RES2 RES3 RES4 CURR5 CURR6 CURR7 CURR8 RES5 RES6 RES7 RES8 CURR16 CURR15 CURR14 CURR13 RES16 RES15 RES14 RES13 CURR12 CURR11 CURR10 CURR9 RES12 RES11 RES10 RES9 xFAULT VDD VDD xRES xCS FB1 FB2 VSS_SENSE VSSA SDI SCL SDO EPAD VSSA HSYNC VSYNC SPI Interface Registers SMPS feedback Fault detectors Reference DAC 33 Product Specification, Confidential oscillator Sync inputs to synchronize with TV-set Undervoltage detection ( open LED ) turnoff Overvoltage detection ( short LED ) turnoff Temperature shutdown Register lock/unlock function supply regulation feedback outputs current sink inputs 2kV ESD an all other pins mm, 0.5mm pitch LED backlighting for LCD – TV sets and |
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