• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 29 subscribers
  • Views 422 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS5614LA PWM INPUT

Akio Ito
Genius 3595 points
Other Parts Discussed in Thread: TAS5614LA, TAS5086

Hi,

A customer is planning full digital amplifier using tas5086 modulator now. The PWM output of tas5086 is single ended. He has a question whether the difference between 1N+1 and 2N+1 is only the DC offset which is noted in 7.4.1. Mode Selection Pins of TAS5614LA datasheet.

Best regards,
Akio Ito

  • 0
    TI__Genius 9175 points
    Hello Ito-san.

    The major difference is that 1N only supports AD modulation where 2N supports both AD and BD modulation.

    Since the BTL output of a class-D requires 2 half bridges, 2 PWM signals are needed to drive the output FETs in the power stage.

    -Since AD is a simpler modulation scheme, in 1N mode the TAS5614LA will self generate an inverted copy of the PWM input for the second half bridge.
    -BD modulation is more complex and an requires 2 PWM inputs since BD cannot be easily generated from only one PWM line.

    Best Regards,
    Matt
  • 0 in reply to Matthew Beardsworth
    Genius 3595 points

    Hello Matthew-san,

    Thanks for your reply. Can I ask you an additional question?
    Does the DC offset of the note mean 1LSB of the differences between inverted copy and 2's complements?

    Best regards,
    Akio Ito

  • 0 in reply to Akio Ito
    TI__Genius 9175 points
    Hello Ito-san,

    The DC offset increase is cased by slight phase differences PWM edges between the 1N input and the inverted PWM copy generated in the power stage. The device DC offset is trimmed in production for 2N input source so 1N will show slightly different results.

    Best Regards,
    Matt