STEVAL-ILL078V1 STMicroelectronics

S T E VA L - I L L 0 7 8 V 1 1 A, up to 60 V input buck LED driver evaluation board based on the LED6000 Data brief Description The STEVAL-ILL078V1 product evaluation board is based on the LED6000 monolithic current source for high power LED driving. Digital dimming is implemented by driving the dedicated DIM pin. Low drop-out operation with almost 100% duty cycle can be achieved. The LED6000 is a 61 V asynchronous switching regulator with embedded power MOSFET, designed to source up to 3 A of DC current depending on the application conditions. The 250 mV typical R SENSE voltage drop, the embedded switch-over feature on the VBIAS pin and light load management (pulse skipping) are intended to maximize power conversion efficiency across the entire load range. The current limit threshold and the switching frequency are adjustable for application optimization. The device includes an internal 250 Features kHz oscillator that can be externally adjusted up to 1.5 MHz. The size of the overall application is 4.5 V to 60 V input voltage minimized thanks to its high switching frequency Step-down conversion and compatibility with ceramic output capacitors. 1 A programmed LED current Two LED6000 regulators can be synchronized in 500 kHz switching frequency a 180 out-of-phase configuration for reduced Digital dimming total input RMS current. Uses ceramic output capacitors 180 out-of-phase synchronization available Auto-recovery overcurrent and thermal protection RoHS compliant September 2015 DocID028415 Rev 1 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ILL078V1 1 Schematic diagram Figure 1: STEVAL-ILL078V1 circuit schematic C5 470nF NM C6 3 C10 100V 1uF C4 100V 1F C3 100V 4.7F C2 100V 4.7F C1 GSPG2509151040SG 2/4 DocID028415 Rev 1 R1 NM TP1 DIM U1 TP2 TP8 7 12 VBIAS SYNCH SYNCH DIM TP3 2 1 2 T1 VIN VIN 1 VBIAS 3 C13 VIN 2 15 BOO T R4 1uF 0 R12 100nF 4 16V VCC LED6000 100k TP5 C7 5 13 EN EN LX 1 L1 47uH TP4 14 VLED+ LX 2 6 SS D2 9 FB 10 BZX384 FSW 11 8 ILIM TP GND COM P R5 N.M. C8 N.M. TP9 VLED- J1 17 16 D1 R8 STPS2L60 47k R13 R7 1.5k 0.24 1nF R9 33k C12 R6 4.7k C9 2.2n 100p C11 220pF TP6 GND TP7 GND