Transformerless SMPS using ICssihabudheent2016-11-26T13:24:15+00:00 Home › Forums › General Electronics › Transformerless SMPS using ICs Tagged: IC, Power Supply, SMPS, Transformer This topic contains 3 replies, has 2 voices, and was last updated by Ligo George 5 months ago. Viewing 4 posts - 1 through 4 (of 4 total) Author Posts November 24, 2016 at 3:38 pm #13170 sihabudheentParticipant Please suggest some ICs for transformerless switched mode power supply circuits of 12V DC. November 26, 2016 at 9:02 am #13196 Ligo GeorgeKeymaster Hi, Kindly let me know what is the expected Input Voltage, Output Voltage, Required Current etc. November 26, 2016 at 1:07 pm #13200 sihabudheentParticipant Hi Ligo George, Here are my requirements, Input Voltage upto 90-300V AC @50Hz I need dual output voltage – 5V and 12V Need isolated one It is used for out door application It is placed in IP65 plastc boxes It is used for out door street light application Should not use any transformers for stepdown Please sugget any IC for smps circuit without use of Transformer, I Knw one IC “LNK304DN”, which doesnt need transformer. Kindly suggest any other IC. November 26, 2016 at 2:36 pm #13209 Ligo GeorgeKeymaster Check the IC SR086. It is a inductorless switched mode regulator designed to operate directly from rectified AC mains. But it will provide only up to 100mA current. If your application requires current higher than 100mA, you should use a ferrite coil. Author Posts Viewing 4 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic.