Demonstration Circuit 1612A is a fully integrated LED driver with 750mA switch current featuring the LT3519-1 (1MHz switching) and the LT3519-2 (2.2MHz switching). The multitopology LT3519 operates with an input voltage up to 30V (40V transients) but the demo board has open LED protection set at 18V. The board is optimized to drive an LED string of up to 16V at 150mA in a SEPIC topology. The demo board operates from a 6V to 24V input voltage range.
LT3519 features in a low-side integrated 45V 750mA power switch, integrated catch diode, integrated compensation, 3000:1 PWM dimming ratio, overvoltage protection, shutdown control pin and analog LED current dimming control.