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TPS65400-Q1: Schematic review

Che Wen Yeh
Intellectual 910 points
Part Number: TPS65400-Q1

Tool/software:

Hi,

Please help to review schematic, thanks

Vin 12V,

Vout1 1.8V 0.5A,

Vout2 1.1V 3A,

Vout3 3.3V 0.1A,

Vout4 disable

  • 0
    TI__Mastermind 21321 points

    Hi Wen,

    My colleague Lucia will reply later.

    Thanks

    Colin

  • +1 in reply to Colin Chen
    TI__Mastermind 30551 points

    Hi Sir,

    From the schematic, the resistor (R68=100kohm), it means that the target switching frequency in theory is 1.761MHz and the target switching cycle is around 568ns. If we take 1.1Vout rail as an example, the typical Vin=12V. Thus the HS on time need to support 52ns in theory. However, you can find from our EC table that tonmin max value is 150ns. It will be a limitation for the lower duty cycle. We would recommend you can re-design the switching frequency to achieve lower duty cycle (max Vin to lowest Vout). After re-design the switching frequency, you can double check your inductor, Cout and compensation components value.

    Thank you.

    BRs

    Lucia