IEC 61047 pdf download DC or AC supplied electronic step-down convertors for filament lamps – Performance requirements This International Standard specifies performance requirements for electronic step-downconvertors for use on d.c. supplies up to 250 v and a.c. supplies up to 1 0o0 v at 50 Hz or60 Hz with operating frequencies deviating from the supply frequency,associated withtungsten halogen lamps as...