LED driver targets offline lighting products

Provided in standard SO-8 and high-power dissipation exposed pad SO-8 packages, the AL9910 high-brightness LED driver targets interior and exterior offline lighting products.

Supporting universal AC input voltages from 85 to as high as 265V, the exposed pad SO-8 variant helps significantly raise reliability by minimising temperature rise and, through its rugged high-voltage process technology, by withstanding input voltage surges of up to 500V.

System reliability is further improved by the devices' in-built over-temperature protection.

Driving LED arrays with a constant current to better control LED brightness, lighting spectrum and lifetime expectancy, the AL9910 will deliver 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 accepting an external TTL-compatible control signal with a duty ratio of 0-100 per cent and at a frequency of up to a few kHz.

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