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TPS51220A: TPS51220A/about inductor current

Tsukui Yusuke
Guru 21930 points
Part Number: TPS51220A

Hi,

Could you give me advice about attached inductor current waveform.
TPS51220A waveform.pdf
TPS51220A operation is CCM setting.
I would like to know why the inductor current becomes unstable.
Please tell me you have any concerns.

Best Regards,
Yusuke Tsukui

  • 0
    TI__Mastermind 18510 points

    Hi Yusuke-san,

    Would you please check if the loading is just the 5.6A or not? Is there any other system power laoding(AC loading) added in the 5Voutput?

    Does 3.3Voutput have this issue?

    and If OK, would you please upload schematic?

    Thanks.

    BR,

    Yuchang

  • 0 in reply to Yuchang Zhang
    Guru 21930 points

    Yuchang-san,

    Thank you for your response.

    Would you please check if the loading is just the 5.6A or not?
    Is there any other system power laoding(AC loading) added in the 5Voutput?
    →I am checking with customers

    Does 3.3Voutput have this issue?
    →CH2 out put is 3.7V. Are you intending VREG3?

    I want you to check the circuit diagram and use private message.
    Can I add you as my friend on E2E?

    Best Regards,
    Yusuke / Japan Disty

  • 0 in reply to Tsukui Yusuke
    TI__Mastermind 18510 points

    Hi Yusuke-san,

    Would you please check if the loading is just the 5.6A or not?
    Is there any other system power laoding(AC loading) added in the 5Voutput?
    →I am checking with customers

    ---->OK, waiting your check result,

    It's better disconnect all system loading when doing DC ripple and DC inductor current, and just add DC loaing with E-load or resistor loading. just in case system loading is a AC loading.

    Does 3.3Voutput have this issue?
    →CH2 out put is 3.7V. Are you intending VREG3?

    --->I mean the CH2

    I want you to check the circuit diagram and use private message.
    Can I add you as my friend on E2E?

    ---> Yes, sure

    BR,

    Yuchang