Shortcomings of switching power supply voltage control mode

1. Any change in voltage or load must be detected as an output transformer and then corrected by feedback. This means a slow response speed;

2. The output filter adds two poles to the control loop. Therefore, when compensating the design error amplifier, it is necessary to attenuate the dominant pole low frequency or add a zero point in the compensation to cancel the pole;

3. The loop gain varies with the input voltage, which further complicates the compensation.