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BQ24715: NVDC Benefit

Naizeng Wang
Expert 5460 points
Part Number: BQ24715

Hi team,

Why NVDC can improve the switching frequency?

Thanks and best regards,

Naizeng Wang

  • 0
    TI__Genius 11850 points

    Hi Naizeng,

    With an NVDC architecture charger, VSYS (the system rail) is after the buck converter, so VSYS has already been stepped down from VBUS (the adapter voltage). This is different from a traditional architecture charger, where VSYS is approximately equal to VBUS.

    I think the picture that you posted is saying that NVDC architecture chargers have a lower VSYS and don't need as much capacitance on the VSYS rail. Smaller inductors and output capacitors take up less board space, but the switching frequency is usually higher in order to reduce ripple.

    I recommend taking a look at this blog post, which provides a helpful comparison of various charger architectures:

    https://e2e.ti.com/blogs_/archives/b/fullycharged/archive/2016/09/19/understanding-battery-charger-features-and-charging-topologies

    Some key benefits of NVDC are:

    • NVDC allows supplement mode, where the adapter and the battery can power the system at the same time. This helps prevent overloading the adapter and exceeding its current capability.
    • The VSYS rail is at a lower voltage because it can be regulated at the minimum system voltage instead of the adapter voltage. This saves cost because components on the VSYS rail can have lower voltage ratings.

    Best regards,

    Angelo