6 W LED driver suits backlighting

15 April 2009 Opto-Electronics

ON Semiconductor has introduced a new 6 W LED driver with an integrated, high-power DC-DC boost converter and on-chip diagnostics to maximise efficiency in large, general purpose LCD panel backlighting applications.

As the company’s first multichannel boost device, the CAT4106 is capable of driving as many as 40 white LEDs – or four strings of 10 LEDs with up to 36 V per string – for a total of 6 W of LED output power. Additionally, the device enables designers to maximise backlighting efficiency and reduce space via its built-in diagnostics functions, which automatically adjusts the output voltage to drive the highest forward voltage string with the minimum headroom voltage.

The on-chip diagnostic circuit allows designers to set the minimum and maximum voltage limits for the acceptable range of operation for LED strings through external programming resistors. Any channel which does not regulate within the set range of open circuit or short circuit LEDs will be detected and flagged on the FAULT logic output. The device also provides thermal shutdown and overvoltage protection (OVP).

The CAT4106 features low dropout LED channels of 500 mV at 175 mA and a high-frequency PWM interface, which supports multiple frequencies up to 2 kHz, providing precise, high-resolution dimming control while the device remains fully biased.

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