Two EMC filters are designed for LED lighting
Two EMC filters, the ED100 and ED101 have been announced by Schaffner. They have been designed specifically for the requirements of LED driver circuits. The filter’s common-mode inductance is matched by a “substantial” differential-mode inductance. Their use means only one component is required on the PCB to mitigate both types of noise, saving cost and space while increasing reliability, according to Schaffner.
LEDs are very energy efficient and robust but need to be powered carefully by a well controlled current, whether used in powerful streetlamps or car headlights. LEDs are also very sensitive to over current and driver circuits are required to keep the current supply in the ideal range.
LED lighting drivers need to be efficient, low in cost and compliant to EMC regulations. For EMI suppression, common-mode chokes are a good alternative to x-capacitors when dealing with noise to ground, explained Schaffner. They reduce the leakage current and, by avoiding x-capacitors, help stabilise the power factor.
The ED100 ED101 series differential mode noise mitigation is available in two performance options depending on requirements: High (ED100) and very high (ED101). Both filters are designed for a maximum continuous operating voltage of 300V AC, 50 / 60Hz and meet the requirements for RoHS and REACH regulations.
They offer rated currents up to 2.0A with standard pins and have high reliability of 13 million hours mean time between failure (MTBF). Their use makes it possible to increase the power factor and reduce the leakage current by replacing x-capacitors.
Typical applications are LED equipment, especially LED driver circuits and displays, fluorescent lamp ballasts or any other application that with high demand for differential-mode performance.
Schaffner specialises in EMI and power, with a range of components to support solutions for an efficient and reliable use of electric energy. With its products and services Schaffner Group contributes to the promotion of technologies for the generation of renewable energies, ensures the reliable functioning of electronic devices and systems in compliance with all important quality and performance standards, and meets the requirements for increasing energy efficiency
