Why does my earphone get so hot???

[kaalingomes]

Recently I am building a circuit to drive loudspeaker and earphone.

The circuit was the same as the reference design (Fig. 1 of Page 4) of datasheet.

It works fine with 8 ohm loudspeaker but makes earphone hot if I replace loudspeaker with small earphone.

Is the output power of TDA2822M too big for small earphones?
Is it possible to fix this situation by modifying the circuit?

Thanks for your help!

[Digital Larry]

You probably need a capacitor to block DC.

[Digital Larry]

Another possibility I guess is high frequency oscillation.

[GGBB]