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The speaker spice model in the class d amp design

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chang830

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speaker spice model

Hi,
We are developing a class d audio amplifier whivh is used in the PDA or GSM mobile phones. The amplifier is filterless, i.e. the amplifier is driving the speaker load directly. I wonder, in the designing phase, how should i model the speaker load? A simple inductor seried with parallel connected Cap and Rload is enough for the design? If so, what is the value of the inductor and cap?

Thanks
 

spice speaker model

I think, for equivalent load of speaker, it conmbines serial R, L, and emf, should no Cap.
 

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    chang830

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speaker pspice

peterwangyu said:
I think, for equivalent load of speaker, it conmbines serial R, L, and emf, should no Cap.
Click to expand...

hello,peterwangyu,
Thanks for the reply. Would you pls. explain what "emf" stands for?
 

pspice speaker

chang830 said:
peterwangyu said:
I think, for equivalent load of speaker, it conmbines serial R, L, and emf, should no Cap.
Click to expand...

hello,peterwangyu,
Thanks for the reply. Would you pls. explain what "emf" stands for?
Click to expand...

emf = electro magnetic force.

Loudspeakers can be quite complex ie. not only driver and filter electrical, parameters, is also cabinets parameters influence how louspeaker sems from amplifier side.

if you look around on internet, you can find some spice-models of loadspeakers

(search in my HD)


one i find

* generic speaker simulation (8 ohm)
* as published in Stereophile Magazine.
*
* Donated by Jaime Arbona, converted to subcircuit form

.SUBCKT SPEAKER G $N_0002
R_R29 $N_0002 $N_0001 8
R_R30 $N_0003 $N_0002 5
R_R31 $N_0004 $N_0002 5.6
C_C9 $N_0001 $N_0005 4.7uf
C_C10 G $N_0003 3.3uf
R_R32 $N_0006 $N_0005 0.5
L_L16 $N_0004 $N_0007 0.5mH
R_R33 $N_0009 $N_0008 100
R_R34 $N_0008 G 39
R_R35 $N_0008 $N_0010 0.6
R_R36 $N_0008 $N_0011 0.9
L_L17 $N_0011 $N_0009 1mH
L_L18 G $N_0010 10mH
R_R37 $N_0009 $N_0007 0.7
L_L19 G $N_0006 0.3mH
C_C11 G $N_0008 500uf
.ENDS
Click to expand...


not so simple LCR-circurit...


and other:

https://www.duncanamps.com/spicels.html
 

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    chang830

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