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TPS40210: Boost Converter 24V to 100V

M.A
Prodigy 10 points
Part Number: TPS40210

Hello,

I'm trying to make a boost converter 24v to 100v, so, I used Wbench to generate a design and I chose the following circuit:

After making the prototype, it is not working and I have the same voltage on the output as the input 24V.

The soft start cap voltage keeps oscillating and in some cases I have over current limit triggered  with ISNS  value about ~ 300-600 mV but in other cases and ISNS  is only 27mV but still not working

1) Any idea if this design is missing something?

2) Can this design still deliver 100V even without a load? if not, is it possible to modify the design to be able to always generate 100 V not matter what the load is?

3) Is there an option on Wbench to have a through hole components because it is hard to make a prototype using smd components  ?

Best regards

  • 0
    TI__Mastermind 49951 points

    Hi Mohammad,

    thank you for using the E2E forum.

    Unfortunately, your schematic did not show up here.

    As you have already said the voltage on the current sense resistor is triggering overcurrent event.

    So, I suggest to first investigate on that.

    What is the difference when you see a value of 300-600mV compared to 27mV only?

    Do you have a Diode with a very high reverse recovery capacitance which will drive current into the sense resistor when switching off.

    Can you share the scope plot you have measured on ISNS?

    Best regards,

     Stefan

  • 0 in reply to Stefan Schauer
    TI__Mastermind 49951 points

    Hi Mohammad,

    Doing a SMPS design with through hole components does more easily give issues as the the solution size gets bigger which also increases the current loops in your design and also adds more parasitic components.

    So, this is not the suggested implementation.

    Best regards,

     Stefan

  • 0
    Prodigy 10 points

    Right now, I have always 0V on the ISNS, I think the TPS40210 component is broken.

    The problem is that I built the prototype myself, so I don't follow any layout and the connections between the components are long. Could this be the reason why it doesn't work or will it just induce noise?

  • 0 in reply to M.A
    TI__Guru 61675 points

    Hello M.A,

    Yes, this could be the reason. I would recommend ordering an EVM and exchanging the necessary components (take care on the voltage ratings of all components) because then you have at least a good layout which makes it a lot easier.

    You can do a prototype on a breadboard, but then you still need to follow all layout rules and need to be very careful with having a good GND connection.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    TI__Guru 61675 points

    Hello M.A

    Thank you for sending your schematic through private message. Let me close this thread and finalize the discussion there.

    Best regards,
    Brigitte