ICs Bring Phase-Shifted LED Backlight Drives to Panel for Ultra-Thin Notebooks
Thu, 09/08/2011 - 12:51pm
Semtech’s SC5010 eight-channel white LED driver with PWM phase-shift dimming control uses very low-profile inductors, allowing LED drivers to be built directly into the LCD panel in Ultrabook PCs and ultra-mobile PCs (UMPC) for displays as thin as 4 mm. It also enables ultra-thin LCD displays with longer battery life in tablet, automotive, and other mid-size display applications. The SC5010 delivers higher efficiency when using the same size inductors as existing phase-shifted LED drivers, according to the company, but it is asserted to operate with inductors that are up to 10X smaller while maintaining high efficiency. This enables LED drivers to be designed directly into the panel, even in ultra-thin applications. This is due to the sophisticated control loop architecture, which allows the use of inductors as small as 2.2 µH (1 mm height). The phase-shifted technology in the SC5010 also minimizes demand on the input and output capacitance offering the high efficiency of conventional non-phase shifted switching regulators, with significantly lower noise, less EMI, and no need for noise filtering components, according to the company.