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WEBENCH® Tools: Need help from an expert to concive one switching dual power pcb via webench

Jovan M
Prodigy 90 points
Other Parts Discussed in Thread: LM2587, TPS54308, TPS54334

Tool/software: WEBENCH® Design Tools

Hello! 

wanted to ask is there someone who can help me to design one power supply pcb:

I want to use an appropriate buck converter to transform incoming 14-24 DC and have dual output on +12V  and -12V  and also 5V (which will be via one regulator I imagine) so in fact will be triple output

all that with at least 900 mA or 1A or more at output (maybe less for 5V)

would like to be not bigger than 7cm X 4,5cm, with good (normal)  efficiency and silent

if it  that is possible i will be grateful for your kind help since I'm not an engineer (so not understand everything on webench application) 

Thanks in advance!

  • 0
    TI__Genius 14455 points
    Hi Jovan,
    You can try using the LM2587. Here is a design created in WEBENCH. The load is 0.9A for +12V, -12V and 5V.

    webench.ti.com/.../SDP.cgi

    Regards,
    Gerold
  • 0 in reply to Gerold Dhanabalan - Online Design Tools
    Prodigy 90 points
    Thanks for help Gerold,
    In the BOM list there are some custom parts that I'm not sure how to obtain, and also there is no pcb renderer to export the file to create the pcb
    Do You know how to deal with this issus? is it possible to create in webench?
    Thanks!
    Best regards
  • 0 in reply to Jovan M
    TI__Genius 14455 points

    Hi Jovan,

      Here is an alternative solution proposed by Ed which avoids the transformer.

    Here is the shareable WEBENCH link for each of the designs.

    TPS43601
    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=5BB34AC5F3E5BF12

    TPS54308
    webench.ti.com/.../SDP.cgi

    TPS54334
    webench.ti.com/.../SDP.cgi

    Regards,
    Gerold

  • 0 in reply to Gerold Dhanabalan - Online Design Tools
    Prodigy 90 points

    Great!

    Thanks a lot Gerold!

    Sorry but I have some more naive questions now:

    1) Can I put all three circuits together on one pcb (I mean in terms of possible interferences, eventual noise, etc, should I add the LDO to 5V circuit than) ?

    2) If yes, how I organize the source DC input for all three circuits, would they have a common ground etc?

    3) for exemple one laptop ac dc adapter 24V 2A will be fine for alimenting all three circuits?

    4) Since in the BOM most parts are not available so I will need alternative parts, if I choose the most similar with small differences do I have to recalculate everything every time?

    Best regards,

    Jovan

  • 0 in reply to Jovan M
    TI__Mastermind 26710 points
    Jovan,

    I got some feedback after talking to an expert. Relaying the message here and hopefully this helps.

    You can lay the three designs just like the tree above with single input (note the 1.217A input current requirement to drive the three converters )and use a common ground. You will need to keep the switch node of the converters away from the critical path analog components in other converters. Also, please follow the guidelines for PCB layout from the respective devices' datasheets. Usually, there is a good layout guidelines section like on page 24 of the TPS54334 datasheet: www.ti.com/.../tps54334.pdf

    When you find alternative parts, try to find parts with same values and parasitics. You can always use the "Select Alternate Part" button from the BOM page when you click on the converters design within the WEBENCH power designer tool. If the alternate part is not available, you can choose something similar or create custom part. The tool recalculates the operating values and charts once the components are updated.

    Regards,
    Amod Vaze
  • 0 in reply to Amod Vaze
    Prodigy 90 points
    Big thanks Amod,
    I'll try to figure out how to do it since I'm not the engineer but like to learn. I have to change parts because it's me who is going to solder and there are many "nano" smd parts in the BOM so: Do the parts listed as alternative are all supposed to fit normally in the design? Is possible for someone to draw a quick idea of the possible best way to organize this PCB? Is it feasible in WEBENCH or got to use Eagle or KiCad etc?
    Have to say that I'm very pleasantly surprised of great willing to help of members of TI Forum!
    Best regards,
    Jovan
  • 0 in reply to Jovan M
    Prodigy 140 points

    Hi Jovan,

     The boards are designed to accommodate the components which are listed in Option 4 default BoM and some parts support Option 5 too. ( Option 4 and Option 5 contains bigger components) .

    In WEBENCH design, it is not possible to  organize all the three designs in single PCB. You can try by referring the three layouts and create a new PCB.

    Regards,

    Janardhan S

  • 0 in reply to Janardhan S
    Prodigy 90 points
    Hi Janardhan,
    Thanks for advice, not sure where to find these options. You think of BOM of solutions of different designs before choosing one in particular?
    Or when BOM list once opened?
    Regards,
    Jovan
  • 0 in reply to Jovan M
    Prodigy 140 points

    Hi Jovan,

         Optimizer Dial or Options can be found on the left top when the design is opened. Please find the Images below.

    Optimizer Dial :

    Optimizer Tuning Philosophy :

    Please go through the link below for more details about creating design in WEBENCH.

    https://webench.ti.com/help/#t=PowerDesigner%2FOptimizer_Knob.htm

    Regards,

    Janardhan S