Zetex Semiconductors offers chip to drive high-power LEDs
HAUPPAUGE, N.Y., 28 June 2007. Zetex Semiconductors in Hauppauge, N.Y., is offering the ZXLD1362 chip that drives as many as 16 high-power light-emitting diodes (LEDs), with as much as 1 amp of adjustable output current, at frequencies as high as 1 MHz.
Operating from a 6- to 60-volt input supply at as much as 95 percent efficiency, the TSOT23-5 packaged driver has a maximum footprint of 2.8 by 2.9 millimeters, and an off-board height of one millimeter.
This integrated chip requires four external components, and supports a wide range of flexible LED brightness and thermal management schemes. Sensitive, accurate LED brightness control has a typical dimming ratio of 1000:1 at 300 Hz, and adding an external capacitor enables a soft-start feature.
The ZXLD1362 output current is adjusted by applying PWM or DC voltage control signals to the adpin, and a low voltage signal turns the output off and initiates low current standby mode.
Application features include a 60-volt MOS switch integrated with a high-side, output current sensing circuit. An external resistor is used to set the nominal output current, and enables high-power LEDs to benefit from ground referenced return paths, of particular importance in architectural lighting.
The compact chip also withstands high-voltage transients, and is suitable for space-starved automotive and industrial applications. It is a drop-in upgrade for many low-power solutions, including Zetex Semiconductors ZXLD1350 (30-volt, 350-milliamp) and ZXLD1360 (30-volt, 1-amp).
For more information contact Zetex Semiconductors online at www.zetex.com.