Class D amps perturbation PWM and signal when output current increases

[PhilGood_82]

Hello everybody

Using IRS2452AM for class D amplifier solution, we face a problem when output current on the load increases : output signal is disrupted on the negative side of the signal (see attached file) ; after checking other points, we see that PWM output signal is also disrupted.

All power supply seem clear.

Has anyone ever encountered this type of problem ?

Thank you

[bluespark]

Hello, 

Here are 2 additional pictures of the problem we encounter with PhilGood_82: in yellow is the output of the low pass filter behind the half-bridge, and in pink is the PWM output from the IRS2452AM (pin 15 HO1). You can see the strange behaviour of the HO1 pin, what can be the root cause?

[Shiva_C]

Hi,

Can you please share us the SCH and Layout file for analysis.

BR,

SC.