Audio amplifier 45W/2Ohms

Petar Milchev

Hi, all.

Could you recommend a class AB audio amplifier, which supply voltage is 12Vdc , 2/4 output channels, load is 2 Ohms and 45W of power.

I will appreciate any further information :)

Best regards,

Petar

0 Don Dapkus over 11 years ago

Hi, Petar,

I don't think that you have enough voltage to get the power that you are looking for.

0 Petar Milchev over 11 years ago in reply to Don Dapkus

Hi, Don,

Yee, I am thinking so too... So now I will use 13.5V to generate this power. Do you have any suggestions?

Regards,

Petar

0 ArdWar over 11 years ago in reply to Petar Milchev

That barely sufficient.

You can estimate maximum output power from supply voltage by:
P_max = V_s²/ 2Z_o

So for 45W to 2 ohm, you need at least 13.4V. Allowing for voltage drop across transistors, you need approx. 16V supply.

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