Advanced Analogic Technologies has announced the AAT3104 and AAT3195, two new 4-channel, charge pump-based LED drivers for larger led street light fixture in reduced feature set cell phones and portable systems. Available in compact 2 x 2.1mm packages, the devices offer designers 16 -step, 32-step or PWM current control in a space-saving footprint. By using an efficient charge pump with 1x and 2x modes, the AAT3104 and AAT3195 drivers reduce the external component count by 25% over competing solutions. To deliver uniform brightness and excellent matching between adjacent Led.Leds, the AAT3104 provides common current sinks for command anode configurations, while the AAT3195 supports common sources for common cathode configurations.The AAT3104 is a current-source LED driver capable of driving up to four LEDs at up to 30mA each. The charge pump-based device automatically switches between a 1x and 2x mode to maximize efficiency and optimize LED current accuracy and matching. LED output current matching is + / -. 10% LED output current matching is + / - 3%.The device operates at a 1 MHz switching frequency and comes in two versions that offer either 16-step (AAT3104-1) or 32-step (AAT3104-2) control of led street light fixture brightness via AnalogicTech Zha patented single-wire S2Cwire interface. A PWM version, the AAT3105, will be available shortly.
The Lighting Research Center (LRC) at Rensselaer Polytechnic Institute has launched a new collaborative initiative-the Light and Health Alliance-to bridge the science of light and health to practical applications, and to provide objective information based on basic and applied research. The Alliance is led by Dr. Mariana Figueiro, LRC Light and Health Program director and associate professor at Rensselaer.Light has a profound effect on health and wellbeing, including sleep, alertness, and performance. Humans need to be exposed to a sufficient amount of light of the right spectrum, for a sufficient amount of time, and at the right time, for the circadian system to remain synchronized with the 24-hour day. The LRC is researching light as a treatment for a variety of conditions, including jet lag, Alzheimer's disease, insomnia and other sleep disorders, seasonal affective disorder and depression. Light can be used to improve sleep, alertness, and performance, along with overall health and wellbeing among the general population, and in populations with rigorous work schedules, such as submariners and night shift nurses."Through this collaborative initiative, we will conduct evaluations, demonstrations, and research projects to develop practical devices and applications using light to improve people's lives," said Dr. Figueiro. "We will also hold seminars and present at conferences to educate key audiences and advance attention to light and health. "The Light and Health Alliance is a collaboration among manufacturers, government organizations and NGOs, codes and standards bodies, along with architects, speci? Ers, medical facility managers and physicians, working to enable the broad adoption of lighting for human health by producing factual information based on basic and applied research and by visualizing future applications. Acuity Brands, Ketra, OSRAM SYLVANIA, and Philips are current members. Dr. Figueiro is seeking interested organizations to join this innovative program. Please email figuem@rpi.edu for details about becoming a member
For LEDs using common cathode configurations, the AAT3195 offers a charge pump-based current-source led street light fixture for similar 4-channel applications. Like the AAT3104, the AAT3195 drives up to 4 LEDs at up to 30mA each. The AAT3195 also automatically switches between 1x and 2x mode to maintain excellent efficiency, current matching and accuracy LED output current accuracy is + / -. 10%, while LED output current matching is + / - 3%.The AAT3195 operates at a 1 MHz switching frequency and comes in three versions with different interfaces. The AAT3195-1 delivers 30mA current across 32-steps using the S2Cwire interface. The AAT3195-2 supports 20mA current across 32 steps also using the S2Cwire interface. And the AAT3195-3 features a PWM interface.Both drivers feature automatic soft-start, a low-current shutdown mode to conserve power, and integrated thermal protection.
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