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DC/DC converter eases circuit form factor of MR16 LED lamp

Posted: 25 Jul 2014  Print Version  Bookmark and Share

Keywords:AL8812  DC/DC converter  MR16  LED 

Diodes Incorporated recently developed the AL8812 DC/DC converter with boost, buck, and voltage-inverting modes.

The device co-packages a 60V, 3.6A-rated power N-channel MOSFET with all primary functions required by a DC/DC controller into the compact DFN6040-12 dual exposed-pad package, enabling a reduction in form factor of MR16 LED lamp circuits.

With a 6mm x 4mm footprint and an off-board profile of just 0.6mm, the AL8812 converter is comprised of a temperature-compensated reference, comparator, controlled duty cycle oscillator with active current limit circuit, driver, and high current output switch.

 AL8812 DC/DC converter

The AL8812 has an input voltage range of 3V to 20V and an output voltage that is fully adjustable up to 60V. This wide operating voltage range makes the device suitable for medium-voltage LEDs and 12VAC lighting applications, as well as dimmable MR16 LED lamps.

Shut-down current is very low at less than 0.01µA, typical, and its maximum output switch current is 3.6A. The converter is able to deliver very accurate voltage and current control by incorporating a precision reference with a two per cent tolerance.

By combining the AL8812 with its AL8807A constant current step-down converter, Diodes Incorporated has produced a two-stage reference design for dimmable MR16 LED lamps that provides good transformer compatibility and low current ripple at a very reasonable BOM cost.





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