STEVAL-ILL088V1 STMicroelectronics

S T E VA L - I L L 0 8 8 V 1 0.55 A, positive buck-boost LED driver board based on LED6000 Data brief Description The STEVAL-ILL088V1 evaluation board is based on a monolithic current source for high power LED driving, the LED6000, a 61 V asynchronous switching regulator. With embedded power MOSFET, it is designed to source up to 3 A DC current depending on the application conditions. The 250 mV typical RSENSE voltage drop, the VBIAS pin embedded switch-over feature and the light load management (pulse skipping) maximize power conversion efficiency across the entire load range. Digital dimming is implemented by driving the dedicated DIM pin. The current limit threshold and the switching frequency are adjustable for application optimization. Features The device also includes a 250 kHz oscillator that 24 to 60 V input voltage can be externally adjusted up to 1.5 MHz. Step-up and step-down conversion (up to 14 LEDs) The size of the overall application is minimized 0.55 A programmed LED current thanks to the high switching frequency and its 500 kHz switching frequency compatibility with ceramic output capacitors. Digital dimming Two LED6000 regulators can be synchronized in Compatible with ceramic output capacitors a 180 out-of-phase configuration to reduce the 180 out-of-phase synchronization total input RMS current. Auto-recovery overcurrent and thermal protection RoHS compliant February 2017 DocID030327 Rev 1 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ILL088V1 1 Schematic diagram Figure 1: STEVAL-ILL088V1 circuit schematic 2/4 DocID030327 Rev 1 TP1 DIM T1 3 1 TP10 GND U1 TP2 7 12 SYNCH SYNCH DIM TP3 TP8 2 1 VIN VBIAS VIN 1 VBIAS 3 C13 D3 VIN 2 15 BZX384-C51 R4 BOOT N.M. R12 0 100k 4 100nF D2 LED6000 STPS3L60 VCC TP4 TP5 C7 5 13 VLED+ EN EN LX 1 14 LX 2 6 SS R5 N.M. C8 N.M. 9 FB 10 FSW 1 R6 3k C9 68nF C12 11 8 J1 ILIM TP GND COMP 100p TP9 2 R7 10k + C11 220pF VLED- 17 16 R9 R13 R8 C2 33k 47k 0.47 TP7 GND TP6 L1 68uH GND GND PLANE R15 D4 100R BAS70 D1 R18 STPS3L60 C15 N.M. 2.2nF Q1 C16 N.M. D5 R16 BZX384-B12 N.M. 33 F/63V C1 4.7F 100 V C3 1F 100 V C4 1F 100 V C10 22n F 2 STN3N F06L /SOT223 C6 NM 1uF C5