Opto-Electronics


WLED driver with PWM-controlled boost

9 June 2010 Opto-Electronics

The MAX6948B from Maxim is a high-efficiency WLED driver with an integrated boost converter and five GPIO ports that can be used to drive LEDs (powered from an alternate power supply) in parallel.

Capable of driving up to six LEDs in series, the boost converter allows PWM control of the boost voltage to maximise power efficiency. The I²C-programmable, 10-bit PWM signal enables 1024 levels of WLED intensity, thus providing precise control over display brightness.

To save space, the driver features a 2 MHz switching frequency to minimise the size and cost of external components. It can supply up to 30 mA of load current under all conditions. Additionally, the five GPIO ports can function as extra logic ports or as constant-current sink drivers. Capable of accurate current control on parallel LEDs, they feature multiple levels of constant-current drive and are PWM programmable. The ports are ESD protected up to ±8 kV HBM to eliminate the need for external ESD protection circuitry.

For more information contact Larry Gordon, CST Electronics, +27 (0)11 608 0070, sales@cstelectronics.co.za, www.cstelectronics.co.za



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