LED driver includes on-chip diagnostics

ON Semiconductor has introduced the CAT4106, a 6W LED driver with an integrated DC-DC boost converter and on-chip diagnostics.

As the company's first multi-channel boost device, the CAT4106 is capable of driving as many as 40 white LEDs - or four strings of 10 LEDs with up to 36V per string - for a total of 6W of LED output power.

The device enables designers to maximise backlighting efficiency and reduce space via its built-in diagnostics functions, which automatically adjust 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 that does not regulate within the set range of 'open circuit' or 'short circuit' LED will be detected and flagged on the Fault logic output (active-low, open-drain).

The device also provides thermal shutdown and overvoltage protection.

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

The CAT4106 LED driver is available in a 4mm x 4mm 16-lead TQFN package and a 16-lead TSSOP package with an exposed thermal pad for enhanced power dissipation.

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