18 February 2011
The new A8515 from Allegro MicroSystems Europe is a multi-output white LED driver for LCD backlighting in consumer and
industrial displays.
The device can operate from a single power supply over a wide input voltage range (from 5 to 40V) and incorporates advanced protection features to provide a high degree of fault tolerance for optimised viewing.
The A8515 integrates a current-mode boost converter with internal power switch and two current sinks that can drive up to 24 LEDs at 120mA. The two LED current sinks can also be paralleled together to achieve LED currents up to 240mA. The low 720mV regulation voltage on LED current sources reduces power loss and improves efficiency.
An external pulse-width modulation (PWM) signal applied to the PWM dimming input pin is used to control the LED intensity. The device also integrates a driver for an optional external input disconnect switch.
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