sanchez, have a look at these articles by rohm semiconductor on DC-DC converter layout: https://techweb.rohm.com/knowledge/dcdc/dcdc_pwm/dcdc_pwm03/2734
this is quite a handy guide on how to optimize the layout of your board. since you are also using an LT part, I would also highly recommend using LTspice (free design and simulation software from LT) to model the LT1308A on your computer and do simulations with different resistors, capacitors, transformers, etc... https://www.analog.com/en/products/lt1308a.html#product-documentation if you use these design tools you can save yourself a lot of troubleshooting and frustration On Wed, Jun 24, 2020 at 9:06 AM MrThe50sanchez <[email protected]> wrote: > Hello ! > > Yes, I used the components that the Datasheet says, I got it from here: > > > The thing is, that a Triple Voltage Circuit uses electrolitic capacitors, > this is not the same configuration as a voltage triple circuit, but, Can It > be that the capacitors I added are not electrolitic? I just > putted normal ones (SMD 10nF 250V). > > Thanks a Lot! > > > > > > El miércoles, 24 de junio de 2020, 14:49:49 (UTC+2), Paul Andrews escribió: >> >> 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 <[email protected]> >>>> 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 [email protected]. >>>>> 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 [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/0c171ec5-8a36-4e9b-9d57-6fecd1d37101o%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/0c171ec5-8a36-4e9b-9d57-6fecd1d37101o%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 [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CALcVLKLZ3S29UgLut-YLXk92E-R%3DxKF3BsU_CPHjb9ustM4m_Q%40mail.gmail.com.
