STEVAL-ILL026V1 3 W non-isolated offline LED driver demonstration board based on the VIPer22A-E Data brief Features Input voltage: 90 to 265 VRMS 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 VAC input version with no electrolytic capacitor EN55015 & EN6100-3-2 compliant RoHS compliant STEVAL-ILL026V1 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 VIPer22AE, 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 VDD pin, accommodates 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 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 CON2 2 1 J1 4 - R7 10-1W_10% 1 2 BRIDGE +3 D3 C8 330nF400VDC C7 330nF400VDC/470nF400VDC 1mH-100mA 1mH-100 L1 1 2.2uF450v + C3 FB FB 6 5 7 8 330nF16V C4 SOURCE DRAIN V IP E R 2 2 CONTROL Vdd 4 2/4 3 FB 1 2 39V500mW D1 R5 1R5_1/4_1% C6 330nF16V D4 STTH1R06 R4 10K1/4 4k71/4 R1 1mH L2 Q2 BC547A 10K1/4 R3 Doc ID 16766 Rev 2 22uF50V C5 Q1 BC557A R6 6K81/4 R2 4K71/4 J2 1 2 CON2 D2 STTH1R R06 Figure 1. 1 2 1 C1 22uF50V Vdd Schematic diagram STEVAL-ILL026V1 Schematic diagram STEVAL-ILL026V1 schematic diagram AM05447v1 STEVAL-ILL026V1 2 Revision history Revision history Table 1. Document revision history Date Revision Changes 11-Nov-2009 1 Initial release. 04-Dec-2009 2 Updated title in Figure 1: STEVAL-ILL026V1 schematic diagram. Doc ID 16766 Rev 2 3/4 STEVAL-ILL026V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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