Flyback-loop-compensation电子电路详解.pdfVIP

Using an automated Excel® spreadsheet to compensate a flyback converter operated in current-mode Christophe Basso, David Sabatié ON Semiconductor download Go to ON Semiconductor site and enter flyback in the search window Download this file /pub/Collateral/FLYBACK%20AUTOMATION.XLS 2 Launch the file Flyback_automation.xls Make sure macro security in Excel® is on medium position Use the “.” as the system decimal separator Fill-up the fields Press update 3 The principle of operation Enter the component values as you calculated them Fill-up the operating fields with the worse case conditions Vout, the dc output voltage in V Iout, the output current in A Operating fields V , the rectified bulk voltage in V bulk Rpullup , the opto coupler pullup resistor GFB, internal FB signal to CS divider Controller dependent Fsw, the switching frequency in kHz L , the transformer primary inductor in µH p Np , the transformer primary turns N , the transformer secondary turns s Your design Rsense, sensing resistor in ohms Cout, output capacitor in µF Resr, output capacitor ESR in ohms From the manufacturer 4 The principle of operation The adapter example, a 19-V/3-A universal mains converter Vout, the dc output voltage in V = 19 V Iout, the output current in A = 3 A V , the rectified bulk voltage in V = 120 V bulk Rpullup , the opto coupler pullup