LED Driver IC For Lighting-System Applications

Diodes Incorporated has launched a multi-topology LED driver IC designed to increase the reliability of high-brightness lamps in automotive, industrial and commercial lighting systems. The ZXLD1370 LED driver controller operates in buck, boost and buck-boost modes. It combines control loops (patent pending) and high-side current sensing to ensure accurate control of LED strings.

With an extended 6V to 60V operating input voltage range and a typical one per cent output current tolerance in all topologies, the driver is capable of delivering the high current levels and tight inter-lap luminance matching required by high-brightness LED systems.

Diodes Incorporated said LED reliability and longevity is improved by active LED thermal management achieved via a dedicated external thermistor input, and by fault diagnosis outputs that report status of LED driver and load. The ZXLD1370 LED driver controller, used with an external Mosfet, provides a single-driver solution capable of supporting a range of LED configurations and current requirements. It supports high-accuracy dimming through DC dimming and PWM dimming options.

With a dedicated PWM input, the driver offers a 1,000:1 dynamic dimming range at 1kHz. This allows for high-accuracy control of colour mixing and good resolution at low brightness levels. The device's 1MHz switching frequency capability with 100kHz low-frequency clamp also means a reduction in the size of the external inductor and simpler design of input EMI filters should they be required.

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