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AS3693B Datasheet(PDF) 2 Page - ams AG |
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AS3693B Datasheet(HTML) 2 Page - ams AG |
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2 / 33 page  AS3693B austriami crosyst ems www.austriamicrosystems.com Revision 1.21 / 2011-09-30 1 - 32 1 General Description The AS3693B is a 16 channels high precision LED controller with build in PWM generators for driving external FETs in LCD-backlight panels. External clock and synchronizing inputs allow the synchronization of the LCD backlight with the TV picture. Local dimming and scan dimming is supported by 16 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. 2 Key Features 16 Channel LED driver Output current only limited by external transistor Output voltage 0.4V to 50V Absolute current accuracy +/- 0.5% Output slew rate programmable Current programmable with external resistor Linear current control with 8 - bit DAC Linear current control with external analog voltage Digital current control with 16 independent PWM generators Free programmable 12 bit resolution ( period, high time and delay ) Overvoltage detection ( short LED ) Undervoltage detection ( open LED ) Temperature shutdown Fault interrupt output H-Sync, V-Sync inputs to synchronize with TV- set Internal or external PWM – clock I2C interface SPI interface 5 bit device - address (sets device address and interface mode) Automatic supply regulation feedback Each output can be assigned to red, green or blue feedback. Package epTQFP64 and QFN64 3 Applications • LED backlighting for LCD – TV sets and monitors Product Specification, Confidential AS3693B–16 Channel high precision LED driver for LCD Backlight |
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