Triple output controller drives up to 250W of led power

The device offers an input voltage range between 2.5 and 40V. Its fixed frequency, current mode architecture is said to deliver constant, accurately regulated led current over a range of supply and output voltages. The LT3797 is targeted at automotive applications that have to operate through cold crank, stop/start and load dump scenarios as well a range of industrial applications. Each of the device's channels can drive a range of led power in either step up, step down or SEPIC topologies. In a boost configuration, it powers three channels of up to 90V of leds with led currents in excess of 1A, delivering over 250W of power from a nominal 12V input with efficiencies as high as 93%. Each of the three channels is operated by an independent True Color pwm signal, enabling each channel to be dimmed to ratios up to 3000:1. Each channel also offers both robust open led and short circuit protection in boost mode, providing high safety and reliability designs required in automotive applications. A frequency adjust pin enables the user to program the frequency between 100kHz and 1MHz to optimise efficiency while minimising external component size.