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Original question:

TPS61033: IOUT to shift to PFM

TPS61033: Waveform and frequency of PFM

Dice-K
Mastermind 7640 points
Part Number: TPS61033


Hi support team,
This is a question regarding PFM operation.

Is there a way to calculate the waveform and frequency of PFM under the following conditions?

VIN = 5.3V
VOUT= 5.5V
IOUT= 0.05A
L = 2.2μH

Is it best to check by experiment?

Regards,
Dice-K

  • +1
    TI__Genius 12965 points

    Hi Dice, 

    We can check it on the bench, but at first we need to make sure the BOM.

    As I said in another thread, 2.2uH is not recommended for TPS61033, 0.47uH is better.

    And please also provide the output capacitance, this is still related to frequency in PFM. If you load current is lower than 1A, 2*22uF output capacitors is recommended, otherwise 4*22uF output capacitors is recommended.

    Regards,

    Nathan