STEVAL-ILL001V1

STEVAL-ILL001V1 Dimmable driver for HB power LEDs with VIPER22A-E (DALI connector) Data Brief Features ■ Selectable input voltage range: 85 VAC - 135 VAC or 185 VAC – 265 VAC ■ Nominal output voltage range: 3.5 V - 28 V ■ Maximum output voltage at open load: 32 V ■ Output current: 350 mA ■ Dimming range: 0 - 90% ■ EMI standard: EN55015:2000 STEVAL-ILL001V1 Description The STEVAL-ILL001V1 evaluation board introduces an innovative solution for driving high brightness 1 W LEDs (light emitting diodes), using the VIPer22A-E in a flyback configuration with output current control. The power supply is capable of driving a 1 to 8 LED array in the European voltage range of 185-265 VAC without modifications. The same VIPer device can also function within the specifications in the U.S. input voltage range by using an input voltage doubler. An innovative control technique is used to adjust the duty cycle of the output current, in order to dim the luminosity of the LEDs down to 10% of the maximum value (STMicroelectronics patent pending). The proposed driver is suitable for applications such as landscape lighting, street lighting, car parks, bollards, garden lighting, large area displays, etc. Domestic applications such as room lighting, decorative fixtures and architectural lighting can also benefit from a dimmable light source. October 2007 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Schematic Figure 1. IN IN Fs C1 CM C14 D1 D2 D3 D4 C2 J3 C3 + + +Vcc OPT C7 C6 Q2 R3 FB R4 Q1 VDD R5 CONTROL IC1 R6 C4 + D6 C5 R2 D5 DRAIN SOURCE D8 D7 + + C8 C9 R7 L1 +Vcc +Vcc + DZ1 R19 C10 Vref C13 R18 R8 R9 Q3 R11 8 9 13 4 2 + - C11 R23 D9 R10 7 3 R17 + - R22 2 1 R16 DZ2 6 1 IC2 D11 15 - 5 12 CN1 11 14 - + - + 3 4 OUT 16 10 D10 R24 C12 J1 R21 R25 LD1 LD2 LD8 R12 +Vcc R13 R14 R15 Vref R20 R26 J2 2/4 Board schematic 1 STEVAL-ILL001V1 Board schematic STEVAL-ILL001V1 2 Revision history Revision history Table 1. Document revision history Date Revision 30-Oct-2007 1 Changes Initial release 3/4 STEVAL-ILL001V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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