Date: 11/10/2010

Multi-topology LED driver from Diodes for HB lighting systems

Diodes Incorporated has unveiled the ZXLD1374, a multi-topology LED driver for high brightness automotive, industrial and commercial lighting systems. The LED driver operates at buck, boost and buck-boost modes and integrates a 60V power MOSFET switch that can produce a maximum LED current of 1.5A. The IC uses high-side current sensing and patent pending control loops to achieve accurate current control of LED strings.

The ZXLD1374 has an operating voltage range of 6V to 60V with a ouput current tolerance of 1% (typ.) in all topologies and therefore supports the current levels and tight inter-lamp luminance-matching needed by high brightness LED systems. The inclusion of active LED thermal management, achieved via a dedicated external thermistor input, and through fault diagnosis outputs reporting LED driver and load status, results in greater LED reliability and longevity.

With dedicated DC dimming and PWM dimming pins, the ZXLD1374 provides a 1000:1 dynamic dimming range at 500Hz, ensuring highly accurate control of color mixing and excellent resolution at low brightness levels. The IC's 1MHz switching frequency capability with 100kHz low frequency clamp also helps reduce the size of the external inductor and simplify the design of any input EMI filters. For more information, visit the Company's website at http://www.diodes.com.