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Original question:

TPS61023: Parasitic Capacitance

TPS61023: Switching/Output Noise

Shota Mago
Expert 8130 points
Part Number: TPS61023
Other Parts Discussed in Thread: TPS61230,

Hi team,

My customer considers to use TPS61230 and he is evaluating it.

He observes relatively large output noise and overshoot at switching noise whereas he measures each node with pig tail probe properly.

Currently he considers to add snubber, but could you please provide any comment by reviewing schematic/layout/waveform uploaded this internal link in order to minimize noise?

I suggested to add 0.1uF small capacitor to minimize switching loop.

Any other tips to mitigate noise should be appreciated.

Condition:

  • Input voltage:3.5V
  • Output voltage: 5.24V
  • Output current: 800mA

Best regards,

Shota Mago

  • 0
    TI__Mastermind 34231 points

    Hi Shota,

    Please see my comments:

    1. The layout could be optimized by widening the trace. For boost converters, the path between Vout pin, GND pin and output capacitor should be wide and short. Don't use thermal relief connection for C221. Please see TPS61023 EVM layout for reference.

    2. It's recommended to measure the output ripple properly. Remove the hat from the probe tip and wrap a wire around the probe barrel for the ground connection. This minimizes the inductance by reducing the length of the ground return loop.

  • 0 in reply to Zack Liu
    TI__Expert 8130 points

    Hi Zack,

    Thanks for your informative comment!

    Best regards,

    Shota Mago