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TAS6424E-Q1: TAS6424 PBTL schematic error in datasheets

LOIC MARCHET
Prodigy 85 points
Part Number: TAS6424E-Q1
Other Parts Discussed in Thread: TAS6424, TAS6424MS, TAS6424-Q1, TAS6424M-Q1, TAS6424L-Q1, TAS6424MS-Q1, , TAS6422E-Q1, TAS6424E

Tool/software:

Hello,

I wanted to use a TAS6424 evaluation board in PBTL.

I followed the diagram in the datasheet. I didn't succeed and the amp heated a lot.

With this diagram:



Looking at the evaluation board manual, the output wiring is different and appears consistent:

"TAS6424MS supports parallel Bridge-Tied Load. Channels 1 and 2 can be one PBTL channel and channels 3
and 4 can be the other. Before setting a set of channels to PBTL mode, connect the (+) terminals as PBTL
channel (+) and the (-) terminals as PBTL channel (-). Then connect the speaker (+) to the PBTL channel (+)
and connect the speaker (-) to the PBTL channel (-)."

This wiring works and allows you to obtain the powers announced in the datasheet in PBTL mode.

I think there is an error in the PBTL diagram (the outputs of each amp are short-circuited).

This concerns theses datasheets:
- TAS6424-Q1
- TAS6424M-Q1
- TAS6424L-Q1
- TAS6424MS-Q1
- TAS6424E-Q1
- TAS6422E-Q1

Please confirm the error.

Best regards

Loïc

  • 0
    TI__Mastermind 45085 points

    Loic,

    In PBTL mode we short the outputs of channel 1 for the PBTL+ and short the outputs of channel 2 for the PBTL-.  We are able to reconfigure the output stage internally to accommodate this connection in PBTL.  

    I am using the TAS6424E datasheet for reference.  In section 10.1.2, the setup for PBTL must be done in Standby mode (Standby pin pulled low).  If not, the output stage will not be configured correctly and channel 1 and 2 would stay in BTL mode and be shorted.

    Regards,
    Gregg Scott