STEVAL-ILL026V1

STEVAL-ILL026V1 3 W non-isolated offline LED driver demonstration board based on the VIPer22A-E Data brief Features Input voltage: 90 to 265 V RMS Provides 350 mA constant current for LEDs Capable of driving 3 x 1 W LEDs in series with high-precision constant current ( 5% tolerance) Overtemperature protection LED open circuit protection LED short-circuit protection 230 V input version with no electrolytic AC capacitor STEVAL-ILL026V1 EN55015 & EN6100-3-2 compliant RoHS compliant Description The progress made in the field of LEDs is visible on an almost day-by-day basis. Many high power LEDs are currently on the market, such as 0.7 A and 1 A devices. However, the most commonly used LEDs are those with a current of 0.350 A. This demonstration board is designed for 350 mA LEDs and is capable of driving three 1 W LEDs in series with high-precision constant current ( 5% tolerance). The design is based on the VIPer22A- E, which combines a dedicated current mode PWM controller with a high voltage power MOSFET on the same silicon chip. The internal control circuit offers a large input voltage range on the V pin, accommodates DD changes in auxiliary supply voltage, and supports automatic burst mode in low load conditions. The board also features protections against overtemperature, overcurrent and overvoltage conditions. December 2009 Doc ID 16766 Rev 2 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Schematic diagram STEVAL-ILL026V1 1 Schematic diagram Figure 1. STEVAL-ILL026V1 schematic diagram AM05447v1 2/4 Doc ID 16766 Rev 2 Vdd R1R1 Q1Q1 L11 BBCC557A557A R2R2 4K4K7711//44 1m1mH-H-101000mA 4k4k7711//44 VIV IPPEERR 2222 RR33 Vdd DRADRAIINN 10K10K11//44 D2 CCOONTNTROROLL Q2Q2 STTH1RR0066 BCBC554477AA R4R4 RR77 FBFB SSOOURURCECE 1010--11WW 10 10%% 10K10K11//44 C6C6 DD33 33330nF0nF116V6V JJ11 C4C4 L2L2 J2J2 C7C7 2 -+- + 1 333300nFnF440000VVDDC/C/44770n0nFF4400V00VDDCC 4 3 1 2 RR55 1R1R5 1/5 1/4 14 1%% 1m1mHH BBRRIIDDGGEE 33330n0nFF1166VV CCOONN22 COCONN22 ++ CC33 C8C8 2.2.22uuF4F45050vv 333300nFnF4400V00VDCDC FB FB D4D4 C5C5 R6R6 SSTTHTTH11RR0066 66KK8181//44 2222uuFF550V0V 2 1 3 4 5 6 7 1 8 2 2222uuF5F500VV C1C1 1 2 339V9V500m500mWW D1D1