TDA8954 output filter

[peter827]

Thank you, 33uH inductors are working fine at +-41V. If I use 22uH, it can only working at about +-28V.

 

[nafo]

Thanks man!

 

[nafo]

thanks!

 

[1400d4d]

I have core T106-2 AL-13.5 micrometals, 40 turns wire 1mm = 22uH
Core is cool, at low volume tda8954.

 

[MAAC0]

1400d4d

Thank You for the tip.

My Behringer B212D are running fine now. The original inductors were getting ridiculous hot.

 

[laplace]

For those of us not interested in winding our own inductors, I am considering the following options:

• Bourns 2200HT-22-V-RC (toroidal, vertical mount)
• Bourns SRP1265C-220M (shielded, SMD)

The toroid has lower DCR - 20mR vs 33mR - and they both seem to have high-enough saturation current (16A, 12A). Most importantly, they are both in-stock at Farnell

Has anyone tried these, or have predictions as to their suitability?

Other parts I would like to confirm suitability of:
* Multicomp MPMPP400P68J0I200 (680n 400V metallised PP) for Clc
* SMD X7R 50V (0805) capacitor for bootstrap (Cbo)
* SMD X7R 50V (0805) for snubbers (Csn)
* SMD X7R 50V (0805) for zobel capacitors (Czo)
* 2W metal through-hole for zobel resistors (Rzo)



Can someone point me to a means of calculating the necessary power dissipation for the snubber resistors (Rsn)?


Does anyone know if there are issues with using a single Zobel filter in BTL mode, instead of two separate filters, each to ground? Do I even care about the Zobel if I'm driving a subwoofer only below 100Hz?

 

[DUG]

"Can someone point me to a means of calculating the necessary power dissipation for the snubber resistors (Rsn)?"

get LTSpice...(free)

put in snubber cct with drive waveform it sees and look at resistor voltage.