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AS3695C 数据表(PDF) 2 Page - ams AG |
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AS3695C 数据表(HTML) 2 Page - ams AG |
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2 / 40 page  www.austriamicrosystems.com AS3695C 16 channel white LED controller for LCD backlight General Description The AS3695C is a 16 channels precision LED controll for driving external FET/BJT in LCD- Dynamic power feedback controls the ext 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 only limited by external 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 ) 1 Block diagram Rev 1.11 / 2010-12-08 1 - 39 16 channel white LED controller for LCD backlight eneral Description is a 16 channels precision LED controller -backlight panels. Dynamic power feedback controls the external power best efficiency. Build in safety include thermal shutdown as well as open and detection. The device is programmable via Output current only limited by external transistor bit DAC Current accuracy ±0.5% @ VDAC=250mV accuracy ±0.2% BJT base current compensation Output slew rate programmable Current programmable with external resistor ntrol with 16 independent PWM 12 bit resolution Product Specification, Confidential PWM-generator clock Internal RC-oscillator External Clock PLL-synthesized clock from external H-Sync, V-Sync inputs to synchronize with TV 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, 0.5 LQFP64 14x14mm, 0.8 Applications LED backlighting for LCD monitors AS3695C PWM D1 PWM VDD V2_5 S1 xFAULT VDD VDD xRES xCS FB1 FB2 VSS_SENSE VSSA SDI SCL SDO EPAD HSYNC VSYNC G1 PWM D2 S2 G2 PWM D3 S3 G3 PWM D4 S4 G4 PWM D5 S5 G5 PWM D6 S6 G6 PWM D7 S7 G7 PWM D8 S8 G8 D16 S16 G16 PWM D15 S15 G15 PWM D14 S14 G14 PWM D13 S13 G13 PWM D12 S12 G12 PWM D11 S11 G11 PWM D10 S10 G10 PWM D9 S9 G9 SPI Interface Registers SMPS feedback Fault detectors Reference DAC Filt1 Filt2 PLL 39 Product Specification, Confidential oscillator synthesized clock from external signal Sync inputs to synchronize with TV-set Undervoltage detection ( open LED ) turnoff Overvoltage detection ( short LED ) turnoff Temperature shutdown Register lock/unlock function 2 configurable supply regulation feedback outputs kV ESD at voltage sense inputs 2kV ESD an all other pins mm, 0.5mm pitch LQFP64 14x14mm, 0.8mm pitch LED backlighting for LCD – TV sets and |
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