圖1. ADP1055數(shù)字開關(guān)穩(wěn)壓器的全橋應(yīng)用。

Figure 2. Digital power supply enables designers to easily manage power parameters through a graphical user interface.

    The non-linear gain/response function provides a very interesting setting option related to the control loop, which is accessed via the filter button. Nonlinear gain/response supports dynamic control loops, such as dynamic adjustments immediately after load transients. After a great load transient, the output voltage of the power supply usually fluctuates around the ideal rectifier voltage. In the control loop that only uses analog devices, selecting the control loop and power level devices of the power supply can minimize the fluctuation of the voltage under most expected conditions. The advantage of a digital adjustable control loop (such as a feature in ADP1055) is that the response of the loop can be adjusted to achieve compensation in various situations with large differences.

    Figure 3 shows the interface that controls this function. The blue curve in the figure shows the typical behavior of the output voltage after the load transient from high to low. It can be seen that the voltage response at the output end of the voltage regulator will usually overshoot. When the output voltage exceeds some thresholds, the overshoot can be minimized by simply increasing the control loop gain.