Hello! Yes! I would try that, the thing is that if I put those values, Ill get 350V 1,2mA as the datasheet says.
That´s why I made this calculations : If I want to get a Vout of 180V for supply a Nixie tube, I need to put a R1 =47K and R2 = 300. that`s Why I putted those! thanks a lot! El miércoles, 24 de junio de 2020, 14:43:35 (UTC+2), iavine escribió: > > "I have resistor from FB R1 = 47K and R2 = 300 Ohm to get 1,21V Feedback." > > The FB resistors in the datasheet are 10M and 34.8K. Just thinking you > might want to use similar values. Rough calculation your FB divider will > draw more current than the device can supply. I might be wrong but worth > looking at. > > Cheers > Ian > On Wednesday, 24 June 2020, 11:45:17 BST, MrThe50sanchez < > the50s...@gmail.com <javascript:>> wrote: > > > Hello, Thanks for your answer. > > ·Is sad but I dont have and Scope to watch what is going on with the SW > pin from te LT1308 device. > > ·My battery voltage when I connect it is 3.0V and the readings in the Vin > and SW are 3.0V. I add you a pic from the battery Im using and also the > schematic of the PCB. > Is the LB1 and LB0 floating like that? Im from Spain and have searched and > Understand that floating is leaving it not connect to anything, just like > that. > > > > El martes, 23 de junio de 2020, 23:26:00 (UTC+2), gregebert escribió: > > First thing is to get a scope and start looking around. > > 1. You should see the SW pin pulsating. If not, what's happening on the > SHDN and FB pins ? > 2. What is your battery voltage reading when connected and disconnected ? > Are you sure it's 3.0V ? All of the Li-ion batteries I've used are "3.7V", > which really means 3.6 to 4.2V depending upon the sate-of-charge and > load-current. > > The VC and FB pins are sensitive to noise. Make sure LBI is floating. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to neoni...@googlegroups.com <javascript:>. > To view this discussion on the web, visit > > https://groups.google.com/d/msgid/neonixie-l/58ab40d4-a6fb-4dad-be13-48f925764fa2o%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/58ab40d4-a6fb-4dad-be13-48f925764fa2o%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/d52240c3-a8c0-42ef-bcf9-4f302fea3de5o%40googlegroups.com.
