Gast
#2011156
Hallo, ich habe eine Frage zur AN-1148 von National. Dort steht auf Seite 5: The NPN regulator uses a technique called dominant pole compensation because it has no inherent low-frequency poles. In this case, a capacitor is built into the IC which places a pole in the loop gain at a low frequency (Figure 12). This dominant pole (shown as P1) for a typical NPN regu- lator is set at about 100 Hz. The 100 Hz pole causes the gain to decrease at a rate of −20 dB/decade until the second pole (P2) which is located at 3 MHz. At that point, the slope of the gain plot changes to −20 dB/decade. Wieso wird ein zusätzlicher "Pole" P1 eingebaut wenn das Teil sowieso stabil wäre? Verringert ja somit nur die Verstärkung. mfg