austriamicrosystems has announced two new LED driver ICs. The AS3695A - a 16-channel white LED driver for direct lighting, and the AS3695C - a 16-channel white LED controller for edge lighting, extends the company’s portfolio of LED BLU (backlight unit) drivers and controllers for the latest generation of LCD TVs.
Both ICs feature power management and boast the best available accuracy. Outstanding driver accuracy of +/-0.5% guarantees exact brightness and colour matching and channel-to-channel current matching is +/-0.2%, resulting in high lighting contrast ratios for the best possible picture quality and 3D effects. In addition, the high precision AS3695A and AS3695C include novel power feedback regulation for controlling external power supplies for the highest system efficiency and reduced power in LED backlit LCD TVs. Block diagram
The devices are programmable via a SPI (serial peripheral interface) port and provide built-in safety features, including thermal shutdown and open and short LED detection. Other features include linear current setting using a 10-bit DAC, output slew rate programmability, H-Sync and V-Sync inputs to synchronize with a TV, direct PWM mode, undervoltage auto-turnoff, overvoltage auto-turnoff, temperature shutdown and fault interrupt output.
