TI brightens notebook LCD displays with new white LED driver

Tag : led display module

The smallest LED driver to manage up to 60 white LEDs at once, theTPS61181 provides high power efficiency and accurate currentregulation for medium-sized displays used in notebooks, portableGPS, industrial and medical applications.
Notebook and other LCD displays have traditionally relied on CCFL(cold cathode fluorescent lamps) technology to backlight thedisplay. Many portable electronics makers have switched from CCFLto white LEDs for backlighting, allowing for greater power savingsand thinner panels. This conversion has already taken place in mostsmaller LCD applications, such as mobile phones and portable mediaplayers. The TPS61181 gives engineers designing medium-sizedportable applications an easy path to LED design. The integrateddevice, which comes in a tiny 0.8 mm x 3 mm x 3 mm QFN package,provides several protection features, including a driver for anexternal FET to disconnect the battery from the white LEDs duringshutdown and over-current conditions.
Enhanced dimming control provides designers a range of brightness
The TPS61181 offers enhanced pulse-width modulation (PWM)brightness dimming control for a 100:1 brightness range. Featuringtwo patented technologies, the device is designed to minimize anypotential audible noise or output AC ripple across a wide dimmingduty cycle and frequency range.
Key features of the TPS61181
5-V to 24-V input voltage
1-MHz switching frequency (a TPS61182 version provides 1.3 MHz)
Boost output auto-adaptive to white LED voltages
Six-current sink of 25 mA
Less than 2.5 percent current matching and three percent accuracy
Over-voltage protection
White LED open/short protection
Input and output isolation during short-circuit and shutdownconditions.
Pricing and availability
The TPS61181 is available today in volume from TI and itsauthorized distributors. The suggested resale price is $1.75 in1,000-unit quantities. Application notes and related LED productsfor notebook displays are available for download. A TPS61181EVM-259evaluation module is also available and suggested resale price is$49.
LED driver and display solutions
TI provides the broadest portfolio of high-performance products fortoday's LED design requirements, including power management, such as AC/DC,power factor correction, DC/DC and linear power conversion; RFtransceivers; digital signal processors (DSPs); and ultra-low-powermicrocontrollers. TI's products support applications ranging fromultra-small portable displays to the largest lighting and displaypanels in the industry. -Texas Instruments