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TPS61178: About TPS61178 En Function(Pin11)

Bear L
Prodigy 220 points
Part Number: TPS61178


Hi:

I used the follow Schematic diagram, I found the En pin High or low, TPS61178 Vout  is Enable.What's the problem?

Best Regards

  • 0
    TI__Mastermind 46905 points

    Hi Andysss,

    did you observe the issue in several system board?

    how do you conclude "VOUT is enable"? the voltage in the VOUT will be not lower than VIN as the disconnection function is not used in your circuit.

  • 0 in reply to Jasper Li
    Prodigy 220 points

    Hi Jasper:

    I have two system board,they all have the issue.

    No matter "EN" is High or Low,there is voltage in Vout,so,I conclude "VOUT is enable".

    I have two questions:

    1.I have to use disconnect function(Pin 9?) if I want to the Vout is disable(have no voltage)?

    2.In this SCH,If "EN(Pin11)" have a logic high level,What is the state of the Vout?have no voltage or avoltage lower than Vin?

    best regards!

  • 0 in reply to Bear L
    TI__Mastermind 46905 points

    Hi Andysss,

    in your schematic, the VOUT will be (VIN-0.3) at EN pin low, and the VOUT will be 5V (or other setting value) at EN is high.

    if using disconnect function as the schematic in the datasheet, the VOUT will be zero at EN is low.

    what is the input/output requirement  in this application?