I am wanting to hook up the LM4780 in a parallel configuration and have been talking in the past to Royce Higashi who has been very helpful. In any event, do the ground -pins ( 12 and 19)- hook up to the floating dual polarity supply ground or is it a separate ground of some type?
My calculation from the nomogram of supply voltage vs output power , page ten of the ap note, with a 4 ohm load,- for a single amplifier,- is about somewhere around 50 watts. That to me gives an output voltage, peak I suppose, of ( P * Load resistance) ^1/2 = ( 200) ^1/2 = 14 volts; peak I is then 14/4 amps = 3.5 amps. If that current, peak I, is flowing through the figure 3. Rout of 0 .1 ohm, then the wattage I need for Rout is about I^2*R = 1 watt.
My other question is , with the single amp nomogram, of wattage versus voltage, when the amps are connected in parallel, is the output power doubled to 100 watts?
and would that change the calculations I need for the supply current?
