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  3. Diodes Incorporated — AL8866Q LED Driver Controller

Diodes Incorporated — AL8866Q LED Driver Controller

Diodes Incorporated

Diodes Incorporated AL8866Q LED Driver Controller

85 V multi-topology with spread-spectrum

Geared for key automotive LED applications, the Diodes Incorporated AL8866Q LED Driver Controller supports four topologies: buck, buck-boost, boost, and single-ended primary-inductance converter (SEPIC). This versatility enables it to be used in a wide range of front and rear exterior lighting applications.

The AL8866Q features a wide input power supply range of 4.7V to 85V, which makes it suitable for 12V, 24V, and the growing 48V battery systems. The device’s peak current-mode control architecture and 400kHz fixed-frequency operation with spread spectrum frequency modulation ensure low EMI performance.

Allowing PWM or analog dimming of the LED current via its DIM pin, this LED driver controller achieves a dimming ratio greater than 100:1 at frequencies up to 1kHz. An open-drain fault flag, asserted low, indicates various fault conditions such as LED output overvoltage, LED output open/short, cycle-by-cycle overcurrent protection, sense resistor and shorted inductor/diode detection, diode open circuit, and thermal shutdown.

The AL8866Q is offered in thermally enhanced SO-8EP and DFN3030-10 packages. For industrial and commercial applications, a standard compliance version, the AL8866, is available.

Features

  • Wide 4.7V to 85V Input Voltage Range
    • Supports 12V, 24V, and 48V battery lighting applications, including DRL, front headlights, and rear lights.
  • Multi-Topology LED Driver-Controller
    • Suitable for DRL, front headlights, and rear lights.
  • PWM and Analog Dimming via DIM Pin
    • Enables 0.1-1kHz PWM and 0.3-2.5V analog dimming for simple adjustment of LED brightness.
  • Spread Spectrum for Better EMC Performance
    • Passes CISPR 25 Class 5 standard.
  • Multiple Protection Features with Open-Drain Fault Flag
    • Detects overtemperature, UVLO, current limit, LED output open/short, and sense-resistor shorted inductor/diode.

Applications

  • Exterior Front Lights:
    • Headlights
    • Daytime Running Lights
    • Fog Lights
    • Turn/Position Lights
  • Rear Lights:
    • Fog Lights
    • Turn/Position Lights
    • Brake Lights

 

Typical Buck-Boost LED Driver Application

 

 

 

Diodes Incorporated — AL8866Q LED Driver Controller