So if you really want to make this project work, then it's probably best you start with a fresh layout. The PCB layout that you started with needs a lot of work.
Believe me, I made the same mistakes when I first started designing high voltage power supplies. Take a look this article I wrote which describes how I learned about and designed a high voltage boost converter: https://neonkev.com/2019/08/18/project-20-watt-high-voltage-boost-converter/ Your design is a flyback converter, but a lot of the same pcb design still applies. I'll also find some of the articles I read which really helped with my design. Once we have a good layout, then we can work on picking the right values for the feedback resistors and choosing all the other components. There is a bit of a learning curve but be patient, read carefully and learn, and you will make a working design soon enough! On Wed, Jun 24, 2020, 8:49 AM Paul Andrews <p...@nixies.us> wrote: > Read the layout recommendations in the LT1308A datasheet. You will need to > adapt it to this configuration. > > What is the voltage rating of the 47k resistor? What are the voltage > ratings of the 10nF capacitors? What is the voltage rating of BAV21W? What > is the saturation current of the transformer? > > On Wednesday, June 24, 2020 at 6:46:01 AM UTC-4, MrThe50sanchez wrote: >> >> Hello! Thanks for the response! >> >> I add here again the PCB layers that Im using. >> >> >> El martes, 23 de junio de 2020, 23:40:06 (UTC+2), Kevin A. escribió: >>> >>> What does your layout look like? Show us a picture of the pcb with the >>> layers visible. >>> >>> Just the layout of the board can make or break a DC-DC converter with >>> all of the high current transients and control signals. >>> >>> On Tue, Jun 23, 2020, 4:22 PM MrThe50sanchez <the50s...@gmail.com> >>> wrote: >>> >>>> >>>> Hello Again, hope everyone is good! >>>> >>>> I was trying to make a DC-DC booster converter using the LT1308B/A >>>> device, I made a PCB for it, doing the same as the datasheet of this device >>>> says, but I don´t get the High Votage, and that`s >>>> why im here asking for help, I tried a lot of things put don`t know >>>> what it can be. >>>> >>>> This is the schematic I use (This one is from the datasheet) : >>>> >>>> >>>> The PCB I made is the same as this schematic and using the same >>>> components, Im using a *rechargable battery CR2 800mAh 3.0V Li-on.* >>>> >>>> *Any Ideas of what I can do to find what is going wrong?* >>>> >>>> *I have LBI and LB0 from the LT1308 Device not connected to anything. >>>> */SHDN pin is connected to Vin, Positive Voltage to It works. >>>> *Because I want 180V output voltage I have resistor from FB R1 = 47K >>>> and R2 = 300 Ohm to get 1,21V Feedback. >>>> *The capacitors Im using (10nF 250v) are not electrolitic, they are >>>> normal ones. >>>> >>>> >>>> Thankss Guys! >>>> >>>> -- >>>> 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. >>>> To view this discussion on the web, visit >>>> https://groups.google.com/d/msgid/neonixie-l/7d2fbb96-d88c-4341-b89a-2ab723f403dao%40googlegroups.com >>>> <https://groups.google.com/d/msgid/neonixie-l/7d2fbb96-d88c-4341-b89a-2ab723f403dao%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/88551fe2-e03e-4d81-aaf9-794b0a7f5f68o%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/88551fe2-e03e-4d81-aaf9-794b0a7f5f68o%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/CALcVLKJQDO%3D%2B_TKb1r23EJ09r9GkVAwoJ%3DTCNuqJ3cg8W14GAg%40mail.gmail.com.
