In the data design example, what are the values of these three quantities in the formula?
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In the data design example, what are the values of these three quantities in the formula?
Hi,
As the datasheet shown, the power stage gain is 5.1db at 20kHz. Gmea is 92umhos. Fco=20kHz. Gpwerstg and the Fco are simulation data based on the Lout and Cout combination of the design example. For user who don't have simulation tool, suggest to calculate as below,
R3=2*pi*fc*VOUT*COUT/(Gmea*Vref*Gmps)=2*3.14*20kHz*5V*(47uF+47uF)/(92umhos*0.8V*20A/V)=40k
where,
fc is your determine crossover frequency, within 1/10-1/5 fsw is ok.
Gmea is 92umhos.
Gmps is 20A/V.