TAS3251: EMC and EMI root cause

Kevin Huang8

Part Number: TAS3251

Hi Team,

The red line part is the part added due to safety pre-scanning.
This part is not in the application circuit,

Because the capacitance I changed to 1nF (Amp frequency 500KHz changed to 450KHz), but the loss increased by 4W.
Are there any side effects?

0 Dylan Yao over 2 years ago

Kevin,

The 1nF will increase power dissipation on the 10 ohm resistor. There is not additional side effects besides that.

You can adjust this cap value after chamber test.

Dylan

0 Kevin Huang8 over 2 years ago in reply to Dylan Yao

Genius 3005 points

Hi Dylan,

How to calculate the capacitance value?

0 Dylan Yao over 2 years ago in reply to Kevin Huang8

Kevin,

I believe this application note can answer your question.

Dylan

0 Kevin Huang8 over 2 years ago

Genius 3005 points

Because the 10ohm resistor will not be hot, but the capacitor will, can you help me calculate the capacitor specifications?

0 Sam(MPAA) Zhang over 2 years ago in reply to Kevin Huang8

In switching operation, the capacitor got charged and discharged. There is not much power dissipation on it.

Audio forum