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TAS5634: Slew rate differences between PWM a+B and PWM C+D

Michael Knoelke
Prodigy 10 points
Part Number: TAS5634

Hi,

we observe EMI diificultys in mode 011 (2xBTL, AD modulation).

Slew rate at PWM C+D is >20ns, with minimal overshoot. Disconnecting doesn't  affect EMI measuremt.

Slew rate at PWM A+B is <10ns, with massive overshoot. Disconnecting does greatly affect EMI measurement.

Layout at concerned outputs is comparable.

RC circuit can solve this but A+B needs massive damping.

Can someone explain why the slew rate an A+B not comparable to C+D?

Any hints to solve this?

Best Regards

Michael

  • 0
    TI__Mastermind 19080 points

    Hi Michael,

    The gate driving strength should be the same among the four outputs.

    1. Are you driving the same output level? Higher load usually correlates to higher slew rate.

    2. EMC issue is closely related to the layout. Could you provide the EMC results/ sch/ layout?

    Thanks!

    Regards,

    Sam