Home › Forums › General Electronics › heat protection for LM7805 Tagged: 7805, Buck Converter, Heat Sink, Heating, SMPS This topic contains 1 reply, has 2 voices, and was last updated by Ligo George 3 years, 3 months ago. Log In Register Lost Password Viewing 2 posts - 1 through 2 (of 2 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 Author Posts Log In Register Lost Password Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.