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TPS62866: Psychologically manipulating TPS62866 into 100% duty cycle?

ESD Birkenstock
Prodigy 130 points
Part Number: TPS62866
Other Parts Discussed in Thread: TPS62869, , TPS62867, TPSM82866A

Tool/software:

if we play dirty tricks with this part, can it support 100% duty cycle for a secret passthrough mode that no one knows about except us?

Say for example, VOS is connected thru analog mux to VOUT

 but then for fake byp mode it gets tied to ground, presumably it will be 100% duty cycle?

Will the ic support this mode?


Best
Dimitri

  • 0
    TI__Guru**** 150760 points

    Hi Dimitri,

    What is the Vin and Vout you need?  And why do you want 100% mode?

    The TPS62869 supports a higher Vout and thus has a 100% mode.  You can adjust Vout higher with the I2C.

    Chris

  • 0 in reply to Chris Glaser
    Prodigy 130 points

    VIN is 1s cell voltage, so like 3-4.2V.
    Vout is 1.2V nominally, however in some circumstances I would want to pass VIN to VOUT without conversion. This is due to reasons.

    Typically with converter adjustable with resistor div i can just pull FB to ground and the converter will peg to 100% duty cycle, assuming it is capable of 100% duty.

    From my understanding we can't actually set VOUT to a voltage higher than VIN in the range of 3-4.2V, right? Cause its like VOUT can be max 1.something volts.



    Best

    Dimitri

  • 0 in reply to ESD Birkenstock
    TI__Guru**** 150760 points

    Thanks for explaining.  Yes, TPS62866 isn't really designed to work like that.

    The TPS62867 is a similar device, without an I2C interface, and with a FB pin.  So, you could pull FB low, like you said, and it would enter 100% mode.  Would that we work?  We also offer that device in a power module, TPSM82866A.

    Chris