TAS5720A-Q1: Amplification for signal >20kHz

Jared Becker

Part Number: TAS5720A-Q1
Other Parts Discussed in Thread: TAS5720M

Hi Team,

I am looking for an audio amplifier that can handle a signal bandwidth above the audio band, up to 75kHz. Is this a limitation that is set by the audio amplifier itself, or the output LC filter?

I took a look at the TAS5720A-Q1, and it look like the perfect device b/c it is class-D, mono output, and can produce >20W, but I am not sure if it can handle a signal up at 75kHz.. any insight you can provide would be greatly appreciated.

Thank you for your support!

-Jared

over 7 years ago

0 Shawn Zheng over 7 years ago

TI__Mastermind 24835 points

Hi Jared,
Actually our closed-loop class-d products are being widely used in the ultra-sound apllication. It can support upto 75kHz loop bandwidth, but you need to redesign the LC output filter. Do you have TAS5720M EVM board? You can do filter tuning on that board.
Best regards,
Shawn Zheng

0 Jared Becker over 7 years ago in reply to Shawn Zheng

TI__Genius 11845 points

Hi Shawn,

Thank you for the speedy reply! Can I use this calculator to select my LC filter values?

Good to know about the EVM, I will check it out!

Thanks!

Jared

0 Shawn Zheng over 7 years ago in reply to Jared Becker

TI__Mastermind 24835 points

Hi Jared,
You can use that calculator, but it's only a simplified model(pure resistance load). The real load is usually more complex(including inductance, capacitance). Anyway the result got from this should be a good tuning start point.
Best regards,
Shawn Zheng

0 Jared Becker over 7 years ago in reply to Shawn Zheng

TI__Genius 11845 points

Hi Shawn,

Thank you for the note. If I am looking for the same thing, but analog input, do you know if the TAS5421 would work at the higher bandwidth?

I appreciate your insight. thanks!

Jared

0 Shawn Zheng over 7 years ago in reply to Jared Becker

TI__Mastermind 24835 points

Hi Jared,

I'm sorry I'm not familiar with TAS5421Q1, could you please creat a new post with TAS5421Q1 in title in the forum? Then our application expert in this device will give professional answers. Thank you!

Best regards,

Shawn Zheng

0 Jared Becker over 7 years ago in reply to Shawn Zheng

TI__Genius 11845 points

No worries, thank you Shawn!

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TAS5720A-Q1: Amplification for signal >20kHz