STEVAL-ILL079V1 STMicroelectronics

S T E VA L - I L L 0 7 9 V 1 0.5 A, inverting buck-boost LED driver board based on the LED6000 Data brief Description The STEVAL-ILL079V1 product evaluation board is based on LED6000 monolithic current source for high power LED driving. Thanks to the wide device input voltage range, alternative topologies like inverting buck-boost can be effectively implemented. Eight white LED (30 V max.) can be powered by 0.5 A programmed current. Digital dimming is implemented by driving the dedicated DIM pin and the necessary level shifting is achieved with inexpensive external circuitry. The LED6000 is a 61 V asynchronous switching regulator, with an embedded power MOSFET, designed to source up to 3 A DC current depending on the application conditions. The 250 mV typical RSENSE voltage drop, the embedded switch-over feature on the VBIAS pin and the Features light load management (pulse skipping) are 15 V to 30 V input voltage intended to maximize power conversion Negative buck-boost topology efficiency across the entire load range. 8 white LEDs, 0.5 A programmed current The current limit threshold and the switching 500 kHz switching frequency frequency are adjustable for application Digital dimming optimization. The device includes an internal 250 Compliant with ceramic output capacitors kHz oscillator that can be externally adjusted up 180 out of phase synchronization available to 1.5 MHz. The size of the overall application is Auto recovery overcurrent and thermal minimized thanks to the high switching frequency protection and its compatibility with ceramic output RoHS compliant capacitors. Two LED6000 regulators can be synchronized in a 180 out-of-phase configuration for reduced total input RMS current. March 2016 DocID029067 Rev 1 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ILL079V1 1 Schematic diagram Figure 1: STEVAL-ILL079V1 circuit schematic GSPG0203161450SG 2/4 DocID029067 Rev 1 2STR2160 Q1 TP1 3 2 DIM R16 T1 R17 100k 3 1 R15 22k TP10 GND U1 TP2 1k 7 12 SYNCH SYNCH DIM TP3 TP8 2 1 VIN VBIAS VIN 1 VBIAS 3 R3 0 C13 D2 VIN 2 15 BZX384-C30 R4 J3 BOOT 1uF R12 0 100k 4 100nF 25V LED6000 VCC TP4 TP5 C7 5 13 D1 VLED+ EN EN LX 1 STPS3L60 14 LX 2 6 SS R5 N.M. C8 N.M. 9 FB 10 C12 FSW 5.6nF R6 7.5k C9 R14 11 8 J1 ILIM TP GND COMP 0 TP9 R7 47k VLED- 17 16 C11 220pF R8 R9 R13 C14 33k 47k 0.51 N.M. TP7 IC GND ICGND TP6 GND GND PLANE L1 47uH 100pF C1 4.7uF 100V C2 4.7uF 100V C3 1uF 100V C4 1uF 100V C10 22nF 2 1 C6 NM 1uF C5