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The LM3492 integrates a boost converter and a two-channelcurrent regulator to implement a high efficient and cost effecTIveLED driver for driving two individually dimmable LEDstrings with a maximum power of 15W and an output voltageof up to 65V. The boost converter employs a proprietary Projected-On-TIme control method to give a fast transient responsewith no compensaTIon required, and a nearly constantswitching frequency programmable from 200 kHz to 1 MHz.The applicaTIon circuit is stable with ceramic capacitors andproduces no audible noise on dimming. The programmablepeak current limit and soft-start features reduce currentsurges at startup, and an integrated 190 mΩ, 3.9A N-ChannelMOSFET switch minimizes the solution size. The fast slewrate current regulator allows high frequency and narrow pulsewidth dimming signals to achieve a very high contrast ratio of1000:1 at a dimming frequency of more than 3 kHz. The LEDcurrent is programmable from 50 mA to 200 mA by a single resistor.
