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BQ25628EVM: The risk of triggering PMID-OVP in load transient

Ryker She
Intellectual 2150 points
Part Number: BQ25628EVM
Other Parts Discussed in Thread: BQ25628

In Boost Mode Load Transient test (VBAT = 3.8 V VBOOST = 5.04 V IBOOST from 5 mA to 500 mA), the maximum voltage of PMID is 5.54V and the minimum voltage of PMID is 4.76V, is this satisfied standard? Is there a risk of triggering PMID-OVP (MIN 5.5V)?

  • 0
    TI__Guru 54651 points

    Hi,

    For boost mode PMID OVP, the spec is BOOST_PMID_OVP. When the BQ25628 is in OTG mode, Q1 is off to block power from PMID to VBUS. BQ25628 uses two
    comparators to sense OVP during OTG mode. The PMID_OTG_OVP comparator monitors for an overvoltage condition at PMID (VPMID > VBOOST_PMID_OVP.) The VBUS_OTG_OVP comparator monitors for an overvoltage condition at VBUS (VVBUS > VOTG_VBUS_OVP). The details will be added in the next revision of d/s. 

    Thanks a lot,

    Ning.

  • 0 in reply to Ning T
    TI__Intellectual 2150 points

    Hi Ning,

    In BQ25628's datasheet, the VPMID in Figure 10-16 seem over VBOOST*107%. Is this a risk of triggering OVP? But it didn't trigger OVP when I tested. Thanks.

    Best regards,

    Ryker

  • +1 in reply to Ryker She
    TI__Guru 54651 points

    Ryker,

    7% is typical and the scope measurement is not accurate.

    Thanks,

    Ning.