60 V step-down LED driver drives three 100mA LED strings LEDs with 10,000:1 True Color PWM dimming

摘要

Linear Technology announces the LT3597, a 60 V, 1 MHz, step-down DC/DC converter designed to operate as a three channel, constant current LED driver. Each channel of the LT3597 contains a constant current sink LED driver with a dedicated adaptive-output buck converter. This design offers maximum efficiency for applications, such as RGB displays, which require different output voltages for each LED string. From a 48 V input, the LT3597 can drive up to three strings of LEDs, each with up to ten 100 mA LEDs in series, delivering efficiencies of over 90%. The LT3597's multichannel capability makes it ideal for backlighting LED billboards as well as industrial, automotive and medical displays. Similarly, its input voltage range of 6 V to 60 V makes it well suited for industrial, automotive and medical applications. Each LED string can be independently programmed to deliver up to 100mA of LED current with ± 2% current matching between strings.