Single Loop System
The Single Loop System option is used when the power supply includes one compensator with a single feedback loop. For example, a Voltage Mode (VM) step-down or buck converter (see accompanying image) where the output voltage is monitored via the feedback resistor divider network and compared against a reference/setpoint voltage. Based on the measured error, the compensator calculates the Pulse Width Modulation (PWM) duty cycle to ensure that the output voltage is well-regulated.
As an example, provided here is the simplified diagram of a voltage mode buck converter controlled by a Type III analog compensator, where the Digital Compensator Design Tool (DCDT) can calculate the digital compensator coefficients to represent the equivalent controller using a microcontroller.
The DCDT Graphic User Interface (GUI) represents the system using the following block diagrams, where each block diagram must be defined by the designer based on the hardware topology and design.