Any chip?

[soundbabe]

Hi guys,

Can you suggest me an internal bridged, stereo power amplifier chip, up to 40W and work with at least 40V power supply?

Thanks

[pacificblue]

40 W into which load and at which THD? 40 V single supply? That would already give you 37 W into 4 Ohm from an LM3886 without bridging. If you want 40 W into 8 Ohm, it takes much less than 40 V for a bridged amp, e. g. AN7194 needs a 24 V single supply for that.

[soundbabe]

No, I was talking about dual supply, +/-20 = 40V.
The load is a 8 ohms speaker.
Any ready chip?

[Rainwulf]

you wont get 40 watts out of +/-20 volts into 8 ohms unless you use a bridged amp as pacificblue mentioned.

You need at least +/- 30 volt rails to get 40 watts.


A dual supply +/- 20 is still a 40 volt supply.

[tomchr]

How about two bridged LM3886's? Four resistors, two caps, and a few other sundry items (decoupling caps, etc.) and you're done.

I think there is a dual-channel LM3886-ish chip out there also, though I forget the part number. LM4720? I forget. Bridge the two channels... Look in the Overture series by National Semiconductor.

~Tom

[pacificblue]

Originally Posted by soundbabe

up to 40W

..means you want 40 W or less. You can get that from a single LM3886 with ~±29 V rails or from bridged LM3886/LM4780 with ~±15 V rails. You can also get that from a single LM3875 with ~±30 V or from bridged LM3875 with ±17V.

Originally Posted by soundbabe

at least 40V power supply?

..means you want a power supply of ±20 V or more. ±20 V with bridged LM3886/LM4780 will give you ~70 W into 8 Ohm. With bridged LM3875 you get ~60 W into 8 Ohm.

What is more important for you? Less than 40 W or more than ±20V?