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TPS40210: Boost Reference Design

Qiang Ren
Intellectual 2055 points
Part Number: TPS40210
Other Parts Discussed in Thread: LM5155

Tool/software:

Team,

We using the TPS40210 to do a boost, which has input 20-32V, output 48V, current 1.25A. Do we have the reference design? Thanks!

Best,

Qiang

  • 0
    TI__Mastermind 30080 points

    Hi Qiang,

    Thanks for using the e2e forum.
    You can check our internal reference design library for this.
    https://www.ti.com/reference-designs/index.html

    With the keyword TPS40210, you find a list of available reference design.
    I would also recommend to check for LM5155, as this boost controller is very similar to TPS40210.

    Please let me know if you need additional help.
    Best regards,
    Niklas

  • 0 in reply to Niklas Schwarz
    TI__Intellectual 2055 points

    Niklas,

    Thanks for your suggestion. We got the SCH as below and could you please help to review on this? Thanks!

    Delete the SCH here

    Best,

    Qiang

  • 0 in reply to Qiang Ren
    TI__Mastermind 30080 points

    Hi Qiang,

    Thanks for sharing the schematic.
    Here are my comments:
    - VDD is not connected. This is the input pin for the controller. It is required to connect this pin the the input ('VOUT_PA') to supply the driver and enable the device. It is also recommended to a a small cap directly at the VDD pin to reduce possible noise on the input pin (e.g. 100nF).
    - DIS/EN pin is also floating. Connecting this pin is not mandatory, as there is an internal pull-down at the pin to enable the device.
    For increasing system stability, you can consider connecting this pin to GND if the disable function is not required.
    - As the duty cycle can be above 50% is possible for low VIN voltage, you can also consider adding a 0 Ohm resistor directly at the ISNS pin.
    If you see subharmonic oscillation during bench verification, you add external slope compensation by increasing this resistor to remove the oscillation.
    If you already have this 0 Ohm footprint, there is no layout change required to do this change.
    - There is a 10 Ohm resistor on the low side of the feedback divider (R238). I assume this resistor is for injecting a noise signal to measure the feedback loop stability?
    If this is the case, please move the resistor to the upper side of the feedback divider. (in series with R243).

    - For double checking the compensation network, or check if more output capacitance is required, I recommend using our quickstart calculation tool.
    https://www.ti.com/tool/download/SLURB11

    The rest of the design looks okay to me.
    Please let me know if there are additional questions.

    Best regards,
    Niklas