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
Further reading:
Cutting-edge hybrid capacitors
Avnet Silica
Passive Components
Panasonic Industry recently announced the launch of the ZVU Series Hybrid Capacitors, a cutting-edge solution tailored to meet the escalating demands of advanced electronic systems.
Read more...
Low-profile tantalum chip capacitors
Electrocomp
Passive Components
These general-purpose tantalum capacitors from Kyocera AVX are available in multiple case sizes with low profile options.
Read more...
Coupled inductor for high-performance applications
Passive Components
This coil with MnZn core is characterised by its high permeability and extremely low RDC values, which achieves excellent power density and very high efficiency.
Read more...
Power inductors
iCorp Technologies
Passive Components
he HTF-MP series is more suitable for complex multiphase power supply applications in design, effectively meeting the needs of ultra-thin and high-power devices.
Read more...
SMT power inductors
Future Electronics
Passive Components
The Würth Elektronik WE-MXGI SMT power inductors are the latest addition to Würth Elektronik’s moulded power inductor series, engineered for high-frequency power applications.
Read more...
Large capacitance MLCCs at 100 V
RS South Africa
Passive Components
TDK Corporation has expanded its CGA series for automotive multilayer ceramic capacitors to 10 µF at 100 V in 3225 size.
Read more...
Film and mica capacitors
Actum
Passive Components
By utilising various polymer dielectrics plastics, Exxelia film and mica capacitors meet most technical requirements and serve all functions from standard filtering to specialised applications.
Read more...
Power-over-coax inductors
RS South Africa
Passive Components
TDK has expanded the ADL3225VF series of wire-wound inductors for automotive power-over-coax (PoC).
Read more...
Thick film power resistors
Electrocomp
Passive Components
Vishay has released a new product to the market, its thick film power resistor, which is offered in a clip-mount TO-247 package.
Read more...
Compact EMI suppression capacitors
RS South Africa
Passive Components
These new components from TDK are 20% smaller than previous models and meet Grade III Test B standards for temperature, humidity, and bias.
Read more...
printer friendly version