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TAS5424C-Q1: How to handle unused output channels?

Tom Viehrig
Prodigy 50 points

Part Number: TAS5424C-Q1

Hello all,

Im using th TAS5424C-Q1 for a special application and I only use two of the four Channels.

I thought about how to handle unused channels, because I don't need them and I will never use them. I don't have much space and because of this I want to spare the filters for channels 3 and 4.
 They will always stay in High-Z-Mode.

Can anybody tell me if it is ok to let the unused outputs unconnected, or is there a possible problem with EMI that I didn't catch at the moment.

Thanks in advanced.

Tom :)

  • 0
    TI__Mastermind 45085 points
    Hi Tom,
    You do not need to have filters on the unused channels if you leave them in Hi-Z mode. I recommend using channels 1 and 4 to spread the heat out on the IC. If you use load diagnostics, make sure you do not run it on the unused channels, you will get an open load detection.
    Also, you should connect the unused inputs on each channel together with 0.1uF capacitor. This will effectively take care of any noise from entering the device. The CMRR will cancel the noise and keep it from causing any potential crosstalk issues.
  • 0 in reply to Gregg Scott
    Prodigy 50 points

    Hello Gregg,


    Thank you for your reply and the hint with the capacitors on the inputs.
    I forgot to write that I'm using channel one and two in PBTL-Mode so I can't use channel one and four, but this is maybe a good hint for others when they find this thread.

    EDIT: Should I connect channel one inputs also with a 0.1uF capacitors if I use the PBTL-Mode on channel one and two?

    Have a nice day :)

    Tom