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About VIN / Vbias / EN timing of TPS74201 for soft start

Satoshi
Guru 19505 points
Other Parts Discussed in Thread: TPS74201

Even if it Start Up Vin / Vbias / EN in following order, does the soft start operate normally about TPS74201?
・Vbias⇒EN⇒Vin
・EN⇒Vbias⇒Vin
If the internal logic operates before  Vin input, I surmised that Css is charged and soft starting time changes.

Best regards,

Satoshi

  • 0
    TI__Expert 8905 points

    Satoshi,

    The soft-start will not work as intended unless the sequence is Vbias, Vin, EN, or Vin, Vbias, EN. As you stated, the internal logic should not receive EN until after the other supplies are active.

    This is outlined in the datasheet:

    Regards,

    David