all home built solar system

Author	Message
wiseguy Guru Joined: 21/06/2018 Location: Australia Posts: 1261	Posted: 01:03am 09 Jan 2023         andymc70 said   Hello Peter I do have some LM2576HV and I have been looking at the datasheet, lm2576hv.pdf I am looking to create the circuit on page 22, as I have the LM2576HV- adj, and find R1 and R2 (1k and 12K) that will give a 15V output. Please let me know if I am wasting my time. Thanks Andy I have used the LM2576 adjustable modules on a number of projects and they work well for me with up to 56V in, the max I have ever used them with, the circuit you found should work just fine. The resistors you quoted give ~ 16V. Some possible ratios easily obtained are 39K & 3K480, 27K & 2K420, 18K & 1K6 (the second resistor in each case is made up of 2 in series using easily available values) they give 15.014, 14.95 & 15.06 respectively, assuming 1.23V internal ref voltage.