ndarz

826

hace 5 años

Hi, what voltage is the source you have? to see how far it can be done with that source.

Victor E

65.783

hace 5 años

300 watts with lm3386? Hummm

PASSTRAN eci_twi

123

hace 5 años

300w but adding all the power of each lm3886 each has a power of 60w and there are 4 which would give a total power of 240w a little far at 300w that says

Victor E

65.783

hace 5 años

It does not give it, it must be pmpo or musical power. Using 2 in bridge we take 70w rms x 2 = 140w and with good temperature in the heatsink.

PASSTRAN eci_twi

123

hace 5 años

but I think the lm3886 can't work in bridge mode

Victor E

65.783

hace 5 años

why not?

Victor E

65.783

hace 5 años

https://www.digikey.com/reference-designs/en/audio-amplifiers/106 here is one of the many circuits in bridge

PASSTRAN eci_twi

123

hace 5 años

I am not very sure but I had read this in a forum dedicated to lm3886 and they claimed that lm3886 could work in parallel but not in bridge mode I think they have a limitation

PASSTRAN eci_twi

123

hace 5 años

in the datashet many diagrams appear but there is not one where it is in bridge
http://www.ti.com/lit/ds/symlink/lm3886.pdf

Victor E

65.783

hace 5 años

any correctly polarized amplifier can work on bridge, in this case the circuit is class ab.fin of the post for me
See here https://www.digikey.com/reference-designs/en/audio-amplifiers/106. End of the post for me. Cheers

Amperio7

543

hace 5 años

Victor E, you're right. Texas Instruments, Application Note AN-1192 Overture Series High Power Solution.
http://www.ti.com/lit/an/snaa021b/snaa021b.pdf.
Amplifier bridge, page 10, diagram 5.2.1. Parallel amplifier, page 13, diagram 6.2.1 and can also be a parallel bridge page 20, diagram 7.2.1.In the PDF are all the calculations and circuits, for proper operation.
Merry Christmas! and best regards.