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AL8866 - BUCK AND SEPIC LED CONTROLLER

General Description

The AL8866 is a Buck-Boost, Boost, Buck, and SEPIC (single-ended primary-inductance converter) DC-switching controller designed to drive an external MOSFET for high-power LED applications.

The AL8866 operates within a wide input power supply range from 4.7V to 85V.

Key Features

  • Wide Input Voltage Range from 4.7V to 85V.
  • Pre-Fixed 400kHz Switching Frequency (Factory Set).
  • Spread Spectrum Frequency Modulation for Low EMI.
  • Analog Dimming Range: 1% to 100%.
  • 100% Dimming Level ±3% Current Accuracy.
  • 20% Dimming Level ±12% Current Accuracy.
  • PWM Dimming Ratio 100:1 at 200Hz PWM Frequency.
  • Programmable Soft Start.
  • Fault Status Indicator for Protections.
  • Output Overvoltage and LED Open Circuit Pro.

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The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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AL8866 BUCK-BOOST, BOOST, BUCK AND SEPIC LED CONTROLLER Description The AL8866 is a Buck-Boost, Boost, Buck, and SEPIC (single-ended primary-inductance converter) DC-switching controller designed to drive an external MOSFET for high-power LED applications. The AL8866 operates within a wide input power supply range from 4.7V to 85V. Based on a fixed-frequency, peak current-mode control architecture, the device incorporates spread spectrum frequency modulation and achieves low EMI performance. The AL8866 modulates LED currents with analog or PWM dimming techniques. The analog dimming response, over a 100:1 linear range, is obtained by varying the voltage at the DIM pin. PWM dimming is achieved by directly modulating the same DIM pin with the desired duty cycle.