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Using TPS650061 with TMS320C6745(power on/down sequence)

masa0301
Intellectual 960 points
Other Parts Discussed in Thread: TMS320C6745, TPS650061

Hi

My coustomer using TPS650061 with TMS320C6745.

Question
・Regarding power on sequence,I checked applicationnote(SLVA484).
①1.2V
②1.8V
③3.3V

But the check the figure3,1.8V is power on earlier than 1.2V.

Which is correct sequence？

・Regarding power on sequence,I checked applicationnote(SLVA484).
②1.2V
②1.8V
①3.3V

Power down sequence  also be the same(figure5).
Which is correct sequence？

Best regards,

  • 0
    TI__Genius 17240 points

    The design in the application note meets the recommended power sequence even though the 1.2V rail is not fully ramped at the time when the 1.8V rail turns on.

    The important parameter is that the 3.3V rail not be above 1.65V unless the 1.2V rail is above 0.9V and that the 3.3V rail not remain powered when 1.2V rail is unpowered.