LED driver handles rigours of higher voltage offline illumination

According to Diodes, for interior and exterior offline lighting products, the exposed pad SO-8 variant helps 'significantly' raise reliability by minimising temperature rise and by withstanding input voltage surges of up to 500V. System reliability is said to be further improved by the devices' inbuilt 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. The 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% and at a frequency of up to a few kHz.