Date: 5th Jun 2011
Multi-output WLED/RGB driver for backlighting
LCD monitors and televisions
Allegro MicroSystems, Inc. has announced a new multi-output
WLED/RGB driver for backlighting LCD monitors and televisions.
The A8516 integrates a boost controller to drive an external
MOSFET and six internal current sink channels capable of
up to 80 mA each, and channels can be combined together
to achieve higher currents.
The boost converter operates in constant frequency (programmable)
current mode control. The LED sink current is set by an
external R_ISET resistor and PWM dimming allows LED currents
to be controlled. The A8516 provides protection against
over-voltage, open or shorted LED string, and over temperature.
A dual level cycle-by-cycle current limit function provides
soft start and protects against overloads.
The A8516 is offered in a 24-pin TSSOP package (LP), a
24-pin SOICW package (LB), with internally fused pins for
enhanced thermal dissipation, both with an exposed thermal
pad for enhanced thermal dissipation. Both packages are
lead (Pb) free, with 100% matte tin lead frame plating.
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