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TPS65132: PFM related questions

Zhanghe Nan
Prodigy 50 points
Part Number: TPS65132

background: ZTE smartphone,TPS65132B0YFFR., the PFM operation interfere with other circuit , so they want to know the answer the following question. 

PFM mode can be disable by configuring register by customer?  My proposed answer is no from D/S.

2.  what current does converter switch from PFM to PWM, switch from PWM to PFM?   No answer from D/S

3. does charger pump has PFM?

  • 0
    TI__Guru 65170 points
    Hello Zhanghe,

    PFM operation should only interfere on the negative output because of the LDO at the positive output. Please explain how it interferes with the panel. What are the observations.

    1. PFM mode cannot be disabled.
    2. This is dependent on the input and output voltage, see Figures 24 and 25 in the datasheet.
    3. See Figures 24 and 25. On the positive output the PFM operation cannot be observed because of the LDO.

    Is it possible that the problem is not coming from the PFM operation, but from the load behavior of the panel? Please check the output voltages with the panel connected with a scope and check if the output voltage is dramatically different from the ones given in Figures 23 to 25.

    Best regards,
    Brigitte