3.8_W可调光功率因数校正LED驱动器.pdf

Design Example Report High Efficiency 3.8 W Dimmable Power Factor Corrected LED Driver Using Title TM LinkSwitch -PL LNK457DG in a Non-Isolated Buck Topology 190 VAC – 265 VAC Input; 42 V – 54 V, 80 mA Specification Output Application LED Driver for Candelabra Lamp Replacement Author Applications Engineering Department Document DER-301 Number Date November 10, 2011 Revision 1.0 Summary and Features  Single-stage power factor corrected and accurate constant current (CC) output  Dimmable  Low cost, low component count and small PCB footprint  Highly energy efficient, 83.5% at 230 VAC input for 48 V  Fast start-up time (300 ms) – no perceptible delay  Integrated protection and reliability features  Output short-circuit protected with auto-recovery  Disconnected load protection with auto-recovery  Auto-recovering thermal shutdown with large hysteresis protects both components and PCB  No damage during brown-out conditions  PF 0.91 at 230 VAC  % ATHD 25% at 230 VAC; 48 V LED  Meets IEC ring wave, differential line surge and EN55015 conducted EMI PATENT INFORMATION The products and applications illustrated herein (including transformer construction and circuits external to the products) may be covered by one or more U.S. and foreign patents, or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations patents may be found at . Power Integrations grants its customers a license under certain patent rights as set forth at /ip.htm. Power Integrations