IXYS Introduces High Efficiency 6-Channel New LED Driver LDS8763
Jan 14, 2011 IXYS Corporation announces the availability of samples and evaluation boards of the LDS8763, an innovative inductor-based, high efficiency, 6-channel White LED (“WLED”) driver. The LDS8763 is able to drive up to 72 WLEDs in six strings with up to 12 LEDs per string. The LDS8763 is delivered with factory programmed LED current at 20, 25, or 30 mA per string and 1.5% channel-to-channel current matching. LED brightness is adjustable by internal PWM pulse generator with duty cycle regulated by external DC voltage applied to the PWM pin. Duty cycle changes linearly from 1% at 0.25 V to 100% at 1.135 V and remains at 100% at higher voltages.
The LDS8763 is an integrated DC/DC boost converter with an internal MOSFET switch as a synchronous rectifier for highest efficiency. The MOSFET operates at 0.7 MHz switching frequency and wide input voltage range of 4.5 to 28 V for power conversion circuitry. It requires a small external inductor of 10 – 33 microhenry, and features under-voltage, over-voltage, overcurrent, and over-temperature protections.
The LDS8763 is available in a 4 x 4 x 0.8 mm 28-pin thermally enhanced TQFN package.
The LDS8763 is intended for backlight LED lighting of medium size LCD displays like notebooks, netbooks, E-books, tablet computers, navigation displays, small LCD TVs and displays. It can also be used in large area LED lighting panels for indoors and outdoors LED lighting fixtures.
Author: BIO T&T
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