TI launched a white LED driver for notebook computers TPS61181

TI (TI) announced the launch of the six channel innovation of a built-in high efficiency boost regulator with 1.5A FET 40V white light emitting diode (LED) driver TPS61181, which helps to display manufacturers fully meet user demand for more energy saving display technology. The most small LED driver TPS61181 can manage up to 60 white LED, can achieve high power efficiency and accurate current regulation function, application field is very suitable for the medium size display, such as notebook computer, portable GPS, industrial and medical fields.

Backlit display of notebook computers and other LCD displays traditionally relied on cold cathode fluorescent lamp (CCFL) technology. Many portable electronics manufacturers backlight technology has shifted from CCFL to the use of white LED, not only to achieve a lower power consumption, but also make the display panel becomes thinner. This technology has been widely used in most small LCD applications, such as mobile phones and portable media players. TPS61181 enables engineers to easily design LED in a medium size portable application.

The use of Micro Devices 0.8 mm x 3 mm x 3 mm QFN package, with a number of protection features, including for external FET drive, can disconnect the battery and white LED to turn off and current situation.

TPS61181 can provide enhanced pulse width modulation (PWM) brightness adjustment control for the brightness range of 100:1. The device uses two patented techniques that can be used to minimize any potential noise or output AC ripple over a wide range of dimming duty cycles with frequency range.

The main characteristics of TPS61181:

5V to 24V input voltage;

1 MHz switching frequency (TPS61182 version is 1.3 MHz);

Improving the output self adaptation of white LED voltage;

Six 25 mA current sink;

The current matching error is less than 2.5% and the accuracy is up to 97%;

Overvoltage protection;

White LED open / short circuit protection;

Isolation of input and output during short circuit and shutdown conditions

TPS61181 has now begun to supply, can now be ordered by TI and its authorized distributors. Notebook computer display manual and related LED product information is available for download. In addition, TPS61181EVM-259 evaluation board has begun to supply.

Source: International Electronic Business