What's the function of the two diodes?

[ZengLei]

Here is a circuit from the datasheet of a Power Amp TDA2030 .
I want to know

why we need D1,D2,R4,C7 here ?

 

[IanP]

D1 - IC output protection, positive voltages that may come back from speaker(s) will be clampped to +Vs ..
D2 - IC output protection, negative ... will clampped to -Vs
R4-C7 snubber network required for stability ..

Regrds,
IanP

 

[ZengLei]

The speaker is a inductive load...

I think the PA is still stable when driving a inductive load rather than driving a capacitive load~~~~

 

[A.Anand Srinivasan]

it is stable because of the protection diodes and the RC snubber..... i mean there would be instabilities due to inductive kickback possibility which is avoided by the above 2...

 

[ehsanelahimirza]

diodes are sending the extra current back to the circuit which may b harmful to the buzzer

and RC for providing a stable input to the buzzer

 

[lladnar23]

As stated above, the diodes are to protect the opamp from transients resulting from the inductive load presented by the speaker (such as from startup, etc..)

The RC network is a "Zobel Network", which counteracts the effect of the inductance of the speaker, especially at high frequencies.