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Allegro MicroSystems A8511 Multioutput WLED/RGB Driver is a fully integrated high-brightness (HB) LED driver solution for medium-size backlighting displays. The flexible A8511 driver does not require external power devices to complete the backlighting design criteria. The A8511 integrates FETs for a boost converter and four 150mA current sinks, delivering a complete integrated solution at HB LED current levels. The device’s LED channels allow up to 600mA sink capability when tied together. The A8511 works from a single power supply of 6.8V to 21V and withstand up to 40V. The operating frequency can be set to 2MHz, avoiding interference with the AM radio band. The integrated boost DMOS switch is rated for 40V at 3.6A. PWM dimming allows LED currents to be controlled up to a 1000:1 ratio. Additional 4:1 dimming can be achieved by using the DIM pin.
The Allegro MicroSystems A8511 Multioutput WLED/RGB Driver enables protection against output connector shorts through an integrated output disconnect switch. An optional external thermistor limits LED current based on panel temperature.
The A8511 driver is housed in a surface mount, 28-pin TSSOP package (suffix LP), with an exposed thermal pad for enhanced thermal dissipation. The device is lead (Pb) free, with 100% matte-tin lead frame plating.
