Home › Forums › General Electronics › heat protection for LM7805 Tagged: 7805, Buck Converter, Heat Sink, Heating, SMPS This topic has 2 replies, 3 voices, and was last updated 5 years, 5 months ago by HarleyDavid. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts December 7, 2014 at 3:46 pm #10116 iqbal hussainParticipant I am using LM7805 for GLCD it heats up too up within 5 seconds. I could not allow it for one minute, what could I do as input voltage is 18V Dc. I have to drive GLCD plz help? December 8, 2014 at 10:23 am #10117 Ligo GeorgeKeymaster You may use heat sink and / or cooling fan.. but the best solution is to reduce input voltage. If you can’t reduce the input voltage, you can use switched mode buck converters. Following link may help you. DC to DC Adjustable Buck Converter May 4, 2019 at 3:03 pm #15894 HarleyDavidParticipant great Author Posts Viewing 3 posts - 1 through 3 (of 3 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in The reCAPTCHA verification period has expired. Please reload the page. Log In