Diodes Inc.'s HB LED driver supports off-line illumination

DALLAS, USA: Diodes Inc., a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic and analog semiconductor markets, announced the release of the AL9910.

Provided in standard SO-8 and high power dissipation exposed pad SO-8 packages, the AL9910 high brightness LED driver will support universal AC input voltages from 85V to as high as 265V. For interior and exterior off-line lighting products, the exposed pad SO-8 variant in particular helps significantly increase device reliability by minimizing temperature rise.

The AL9910 utilizes a rugged high voltage process technology allowing it to withstand input voltage surges of up to 500V. System reliability is further improved by the device’s built-in over-temperature protection.

Driving LED arrays with a constant current to better control LED brightness, lighting spectrum and lifetime expectancy, the AL9910 delivers an output of between a few milliamps and 1A via an external MOSFET operating at a resistor programmable switching frequency up to 300kHz. Removing the need for a start-up resistor, a built-in voltage regulator delivers a gate drive to match and protect the switching MOSFET: 7.5V for the AL9910 and 10V for the companion AL9910A.

To extend device flexibility, the high efficiency AL9910 offers two separate dimming inputs for LED brightness control: a linear dimming input controlled by the application of a dc control voltage, and a low frequency PWM dimming input that accepts an external TTL compatible control signal with a duty ratio of 0-100 percent and at a frequency of up to a few kHz.