for further information contact your local stmicroelectronics sales office. february 2013 doc id 024104 rev 1 1/4 4 STEVAL-ILL046V1 hb led driver with inhibit ba sed on the st1cc40 in a qfn package data brief features 3 to 18 v operating input voltage range 850 khz fixed switching frequency 100 mv (typ) current sense voltage drop 6 a standby current in inhibit mode 7% output current accuracy synchronous rectification embedded compensation network internal current limiting ceramic output capacitor compliant thermal shutdown rohs compliant description the STEVAL-ILL046V1 demonstration board is based on the st1cc40, which is an 850 khz fixed switching frequency monolithic step-down dc-dc converter designed to operate as a precise constant current source with an adjustable current capab ility of up to 3 a dc. in closed loop operation, the st1cc40 feedback pin voltage is 100 mv thus the sensing resistor calculation is expressed as r s = 100mv/i led the STEVAL-ILL046V1 is provided with 660 ma by connecting a 150 m sensing resistor to the feedback pin. the overall application size is minimized, thanks to the high switching frequency and ceramic output capacitor compatibility. the STEVAL-ILL046V1 demonstration board is fully protected against overheating, overcurrent and output short-circuit. the inhibit mode minimizes the current consumption in standby (6 a) to maximize battery life in portable devices. www.st.com
schematic diagram STEVAL-ILL046V1 2/4 doc id 024104 rev 1 1 schematic diagram figure 1. STEVAL-ILL046V1 circuit schematic # ) . # & |