Capacitors for LED lighting
8 June 2011
Passive Components
Murata announced the introduction of a series of capacitors specifically designed to provide DC smoothing and acoustic noise reduction in LED lighting applications. As the market for LED lighting has steadily grown, customers have recognised that a capacitive DC bias (which results in less actual capacitive value) and a piezo-electronic phenomenon within capacitors have been the cause of light flickering and acoustic noise. Previously, many designers have avoided the use of ceramic capacitors in LED lighting applications even though they have superior size and higher temperature reliability.
The GR3 and RDE series of multilayer ceramic capacitors (MLCC) have been designed by Murata to be incorporated in LED lighting circuits, immediately following the bridge rectification stage, to provide DC supply smoothing and EMI filtering. The GR3 family is for reflow soldering use and the RDE family provides radial leaded insertion production. Compared to standard ceramic capacitors, tests by Murata claim a 10 dB reduction in acoustic noise by using the new GR3 MLCC capacitors. Further noise reductions are possible with the RDE leaded parts.
The GR3 is available in 250, 450 or 630 V d.c. rating and popular capacitances starting from 10 nF and up to 1 μF for the 250 V range, to 560 nF for 450 V and 270 nF for the 630 V. Package sizes for the GR3 series include 0805, 1206, 1210, 1812 and 2220. The RDE leaded series has the same voltage rating as the GR3 series with capacitances of 10 nF to a maximum of 2,2 μF for the 250 V part, 1,2 μF for the 450 V, and 560 nF for the 630 V component.
For more information contact Greg Parker, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za
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