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TAS2562: Difference between Internal boost mode and External mode

Part Number: TAS2562

Hi team,

This is Brandon. Met a usage question on TAS2562.

we found that we could use internal boost as PVDD and we could also use external power source as PVDD.

could you tell us the difference between this two mode? and we would like to know what kind of situation should we use internal boost mode and when should we use external mode?

BR

Brandon

  • Hi, Zhanpeng,

    Our team will take a look at this question.

    In the meantime, have you taken a look at this FAQ? It contains information about the use of the external boost.

    https://e2e.ti.com/support/audio/f/6/t/935527

    Best regards,
    Luis Fernando Rodríguez S.

  • HI Brandon,

    First of all PVDD is the voltage rail for the class D output amplifier.

    for internal PVDD mode this PVDD voltage can be selected with BST_VREG[3:0] register bits from 6.5 V to 12.5 V.

    for external PVDD mode this can be supplied anywhere from VBAT to 16 V.

    A main consideration when choosing which mode to use is cost. when using internal PVDD the device will require two additional passive components, L1 and C2. so if the application already has a voltage rail that can be used as the PVDD voltage it will likely be cheaper to use PVDD externally. however if the application only has lower voltage supplies then it will likely be cheaper to add L1 and C2 then to generate the PVDD voltage elsewhere in the application.

    Device performance with external PVDD, and internal PVDD will be comparable.

    Best regards,

    Arthur Brown