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TPS63000 Power supply question

Wes Byers
Prodigy 410 points
Other Parts Discussed in Thread: TPS63000

Need more information on how to stabilize a noisy power supply.

Tried using synchronization feature of the TPS63000, see it move to half, one third, then straight to noisy switching frequencies which vary the input supply voltage even with a constant clock input on the sync pin.

Trying to sync switching frequencies with A/D clock to avoid random signals from being sampled. Any recommendations on actions to take to help with this?

  • 0
    TI__Expert 8420 points
    I would need more information to help you,
    1.Can you share your schematic and layout?
    2.What are your operating conditions? Vin Vout Iout?
    3. Can you share a scope plot where you see the noise?
  • 0 in reply to Sabrina
    TI__Prodigy 410 points

    Hi Sabrina,

    The schematic is basically FIgure 2 of the data sheet for the TPS63000, C1 is created from multiple 4.7 uF ceramic caps and 2000 uF of bulk capacitance made up of 2 1000 uF panasoonic aluminum capacitors. The output feedback uses 1M and 110 kOhm to get 5.045 as Vout. Capacitors are rated to 10 V.

    Also used a 33 uH inductor for L1. Device is pulling 500 mA of current with no load.