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TAS5805M: Loop Bandwidth Settings

Part Number: TAS5805M
Other Parts Discussed in Thread: TAS5825M

Hi,

What is the function of loop bandwidth settings?

With high bandwidth settings (eg. 175KHz), does it means the feedback is faster?

Does it make  AGL and Clipper perform faster?

What are the trade-off?

<Design Background and Problem Encountered>

Our design draw power from USB port which supposed to drive 1.8Wx2 via TAS5805M to 4 ohm speakers.

We are facing surge current issue on different PC's USB port when playback audio at 100% PC volume,

Some PC just  gave higher distortion, but some PC gave ticking or cracking noise.

We notice that ticking or cracking noise happened when USB VBUS dipped close to 4.5V at the USB port.

The PVDD will drop further by  0.20~0.25V.

When PVDD dropped too low, TAS5805M seem to cut-off audio out momentary resulted in ticking or cracking noise.

We are trying to reduce the surge current via AGL, Clipper and DRC.

  • Hi CK,

    Analog bandwidth is related to closed-loop bandwidth, no relationship with AGL / Clipper setting. It's suggested to refer below TAS5825M for selection.

    As for PVDD current limiter, the Clipper is recommended. The tuning steps are slowly to reduce Clipper Level to find the tradeoff point between peak audio distortion and PVDD current.

    Regards,

    Matthew