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TPS65132B / reload function of IVR

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: TPS65132
Hi,
 
I'd like to ask about TPS65132B.
I think TPS65132B doesn't have Power On Reset and the default value is loaded by IVR in power-up sequence(~20us).
--------------------------------------------
(datasheet P.26)
Startup option: At power-up, the value contained in the IVR is loaded into the volatile DR and IVR presets the
DAC to the last stored setting within less than 20 μs. The programmed factory value of the IVR of each address
is described below and, at power-up, these data byte set the output voltage of each rail.
--------------------------------------------
My customer concern if the default value could be loaded involuntarily when VIN decreases instantaneously.
So I want to know the value Vth_L, Vth_H and Duration time that the IVR is reloaded into DR.
Could you give me the value of these?
 
Best Regards,
Yaita / Japan disty
  • 0
    TI__Guru 65170 points

    Hello Yaita-san,

    The default values of the IVR can be reprogrammed by your customer. So when the customer changes the IVR to the values he wants to have as default, I think he does not need to fear a input voltage drop.

    The only situation where he needs to make sure that the input voltage is not droping is the short time when he reprograms the IVR from the DR.

    Best regards,
    Brigitte

  • 0 in reply to Brigitte
    Guru 29720 points
    Hello Brigitte-san.
     
    Thank you for your quick reply!
    I see, you got a point there.
     
    I appreciate for your support.
     
    Best Regards,
    Yaita
  • 0 in reply to Brigitte
    TI__Prodigy 610 points

    Hi, Brigitte

    My customer is using TPS65132, they have met such problem

    TPS65132 can’t pertain the voltage register settings after the regulator being disabled. After the regulator being disabled and enabled again, the voltage will restore back to 5.4V, how should they do to avoid the output voltage restore back to 5,4V after restart? thanks.

  • 0 in reply to Ariel Peng
    TI__Guru 65170 points

    Hello Ariel,

    The customer needs to write the new values from DR to the IVR by writing to the CONTROL register. Please check the datasheet for the details on how to write the IVR. As soon as he reprogrammed the IVR, the IC will start with the new values.

    Best regards,
    Brigitte