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UCC28C40-Q1: design tool for non isolated boost converter

Part Number: UCC28C40-Q1

Hello Team, 

My customer is interested in using UCC28C40-Q1 for non-isolated boost topology

Vin = 7.5V to 15V

Vout = 22V @ 1A

fsw = 450kHz

Webench only support flyback topology with this device.

Is there a design tool for boost topology with this device? ...mainly to calculate compensation and slope compensation component values.

Thank you!


Mahendra Patel

  • Mehendra 

    For slope comp, check out this separate E2E thread where I covered the topic in detail. The boost converter is really just a non-isolated flyback so from a small signal control point of view, many similarities exist. If you want to achieve a higher zero crossing, you need to choose your inductor so the converter remains in DCM and you avoid the effect of the RHPZ (RHPZ frequency increases with decreasing inductor value). If you need to operate in CCM over any portion of your design specs, then you should plan for a zero crossing at least a decade below the lowest RHPZ frequency - this means a larger inductor, lower peak current in your power stage, but poor transient response.

    For your design specs, an inductor value of ~1.75 μH should assure DCM operation and keep the RHPZ near ~240 kHz but your peak current will be ~6A, so you need to tolerate this from a thermal and EMI point of view.

    If you have not already done so, I recommend you download TI Power Stage Designer and enter your values for the boost converter. Power Stage Designer also includes a Loop Calculator tool for designing your compensation and you should be able to get enough insight on slope comp from the thread I provided, Good luck and thanks for connecting through E2E.


    Steve M