Diodes: Wide PWM Dimming Extends LED Lamp Dimming Range

The AL8807B is an enhancement of Diodes’ low EMI buck high brightness LED driver AL8807.

The AL8807B provides protection against a number of potential faults within a lamp:

  • Over-temperature condition: switches itself off
  • Open-LEDs: automatically stops switching
  • Short-LEDs: continues switching but at reduced duty cycle minimising power dissipation.

The AL8807B can operate at up to 1MHz – reducing the size of external components. The small MSOP-8EP package size (same footprint as AL8806/7) coupled with the need for only 4 external components produces a small solution footprint.

The accuracy, temperature range, cost and PWM dimming range make it ideally suited to dimmable LED lighting applications.

The Diodes Advantage:

The AL8807B provides a simple wide PWM dimming range solution for Low Voltage general illumination LED lamps.

Simple PWM dimming

  • Provides a simple solution for varying LED lamps’ brightness with higher accuracy and range than analog dimming

Reduced switching noise and ringing

  • Reduces EMI issues – especially in non-optimised layout PCBs

Open-LED, short-LED and Over-Temperature Protection Open-LED

  • automatically stops switching, Short-LED
  • fSW & duty cycle reduces, TJ > 155ºC
  • Thermal trip

Small footprint, low thermal impedance packages – MSOP-8EP

  • High power density small PCB footprint solution

5% initial average LED current accuracy

  • Meets accuracy requirements of most lighting applications at cost effective price and improves inter-channel matching.

Applications:

  • General illumination
  • Multi-substrate LED driving
  • Driving of parallel LED chains
  • Wide Analog Dimming LED lamps
  • 12VAC/DC and 24VAC/DC lighting
  • SELV lighting
See also

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