White LED driver shines in notebook LCD displays
Keywords:white LED? notebook? LCD?
The TPS61181 offers enhanced pulse-width modulation (PWM) brightness dimming control for a 100:1 brightness range. Featuring two patented technologies, the device is designed to minimize any potential audible noise or output AC ripple across a wide dimming duty cycle and frequency range, according to TI. Key features include: 5-24V input voltage; 1MHz switching frequency (a TPS61182 version provides 1.3MHz); boost output auto-adaptive to white LED voltages; six-current sink of 25mA; less than 2.5 percent current matching and three percent accuracy; over-voltage protection; white LED open/short protection; and input and output isolation during short-circuit and shutdown conditions.
The integrated device, which comes in a 0.8mm x 3mm x 3mm QFN package is available now. The suggested resale price is $1.75 for 1,000-unit quantities. A TPS61181EVM-259 evaluation module is also available and suggested resale price is $49.
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