Diodes Incorporated (Diodes) announced the expansion of its automotive-compliant* product portfolio with the AL8866Q LED driver. This DC switching LED driver controller drives external MOSFETs and supports buck, boost, buck-boost, and single-ended primary inductor converter (SEPIC) topologies for high-power LED lighting systems. Applications include daytime running lights (DRLs), high and low beams, fog lights, turn signals, brake/parking lights, and more.
The AL8866Q operates over a wide voltage range of 4.7V to 85V, covering common 12V, 24V and 48V battery-powered rails. Flexible voltage selection and multi-mode operation allow lighting designers to standardize on a single component type, streamlining inventory and simplifying the design process.
The AL8866Q features a fixed-frequency (400kHz) peak current-mode control architecture with Spectrum Frequency Modulation for improved EMI performance, and complies with the most stringent CISPR 25 Class 5 standard.
The AL8866Q supports LED current analog dimming and PWM dimming with a 1% reference tolerance using the DIM pin for better control of brightness between fixtures and improved matching. With an analog dimming range greater than 100:1, the driver achieves ±12% output current accuracy at low analog dimming levels (20%), which is more accurate than comparable LED drivers. PWM dimming (0.1 to 1kHz) achieves 100:1 dynamic range.
The AL8866Q has a built-in soft-start function that gently increases inductor and switching currents to minimize potential overvoltage and overcurrent conditions on the output. The device features an open-drain fault output to indicate a variety of fault conditions including LED output overvoltage, LED output open/short, cycle-by-cycle overcurrent protection, sense resistor and shorted inductor/diode detection, open diode, and thermal shutdown.
The AL8866Q is available in SO-8EP and U-DFN3030-10 package options with an operating temperature range of -40°C to +125°C. The AL8866QSP-13 (SO8-EP) and AL8866QFN-7 (U-DFN3030-10) are now available. Standard specification versions of the AL8866 are also available for industrial and commercial product applications.
