STEVAL-ILL063V1 STMicroelectronics

STEVAL-ILL063V1 3 A LED driver based on the LED5000 in floating boost topology Data brief Description The STEVAL-ILL063V1 is a product evaluation board based on the LED5000, 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 capability up to 3 A DC. The embedded PWM dimming circuitry features LED brightness control. The regulated output current level is set by connecting a sensing resistor to the feedback pin. The 200 mV typical RSENSE voltage drop enhances performance in terms of efficiency. The size of the overall application is minimized thanks to the high switching frequency and its compatibility with ceramic output capacitors. The device is fully protected against overheating, Features overcurrent and output short-circuit. 5.5 V to 48 V operating input voltage range 850 kHz fixed switching frequency 200 mV typ. current sense voltage drop Floating boost topology PWM dimming 3% output current accuracy over temperature 200 mOhm typical RDSON Peak current mode architecture Short-circuit protection Compliant with ceramic output capacitors Inhibit for zero current consumption Thermal shutdown RoHS compliant December 2014 DocID026227 Rev 2 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ILL063V1 1 Schematic diagram Figure 1: STEVAL-ILL063V1 board schematic TP1 TP2 VIN VLED+ D1 BZX384-C43 C6 7 U1 LED5000 NM VIN R1 10K T1 5 FB VLED- 2 2 DIM 4 Q1 COMP TP4 BC807-16 DIM 3 INH 1 R2 BOOT EP 6K2 EP RS1 C3 C5 SW GND R3 R4 R5 0.28 4.7uF 100nF 47K 1K 47K C2 50V C4 8 6 C1 15pF D2 3.3n L1 100nF TP5 GND NM floating GND (Vin-Vout ) NOT switching STPS3L60U L1A (Vin-Vout ) < 0 since Vout > Vin SMB FLAT XAL6060 22uH COILCRAFT XAL6060 xx / XAL5050 xx 2/4 DocID026227 Rev 2 3 1