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TPS65261 Power Up/Down Sequence

taichi
Expert 1395 points
Other Parts Discussed in Thread: TPS65261-1

Heelo, Team

 

My Customer has a question of TPS65261-1.

Power sequencing is written by 'Figure 29. Automatic Power Sequencing' in datasheet.

 

With the following 2cases,

How the operation of sequence the TPS65261-1.

 

Case1) (EN1,2=high and EN3=low)

・Start Sequencing

Buck1→Buck2→Buck3/(unused)

・Shutdown Sequencing

Buck3/(unused)→Buck2→Buck1

 

Case2)

・Start Sequencing(EN1,2=high and EN3=low)

Buck1→Buck2/(unused)→Buck3

・Shutdown Sequencing

Buck3→Buck2/(unused)→Buck1

Regard,

Taichi

  • 0
    TI__Genius 9550 points

    Taichi,

    (MODE pin floating or connect to V7V)

    In case 1, buck3 unused.

    Connect PGND3 to GND, leave pin 13, 15, 16, 17, 18, 19 open.  Control EN3 to start or stop the sequencing.

    Start Sequencing---EN3 low to High

    Buck1→Buck2

    ・Shutdown Sequencing-----EN3 high to low

    Buck2→Buck1

    In case 2, buck2 unused.

    Connect PGND2 to GND, leave pin 6, 7, 8, 9, 10, 12 open.  Control EN3 to start or stop the sequencing.

    Start Sequencing---EN3 low to High

    Buck1→Buck3

    ・Shutdown Sequencing-----EN3 high to low

    Buck3→Buck1

    Jason Wang